diff --git a/.changeset/fuzzy-jobs-eat.md b/.changeset/fuzzy-jobs-eat.md
new file mode 100644
index 0000000000..00df18b1e5
--- /dev/null
+++ b/.changeset/fuzzy-jobs-eat.md
@@ -0,0 +1,10 @@
+---
+'@tanstack/router-ssr-query-core': patch
+'@tanstack/start-server-core': patch
+'@tanstack/react-router': patch
+'@tanstack/solid-router': patch
+'@tanstack/router-core': patch
+'@tanstack/vue-router': patch
+---
+
+fix streaming
diff --git a/e2e/react-start/streaming-ssr/tests/query-heavy.spec.ts b/e2e/react-start/streaming-ssr/tests/query-heavy.spec.ts
index b175365acc..5e90d1f527 100644
--- a/e2e/react-start/streaming-ssr/tests/query-heavy.spec.ts
+++ b/e2e/react-start/streaming-ssr/tests/query-heavy.spec.ts
@@ -128,4 +128,23 @@ test.describe('Query heavy route (9 useSuspenseQuery)', () => {
       .count()
     expect(serverSourceCount).toBe(9)
   })
+
+  test('emits query stream data before stream end marker', async ({
+    request,
+  }) => {
+    const response = await request.get('/query-heavy')
+    const html = await response.text()
+    const endMarker = '$_TSR.e()'
+    const endIndex = html.indexOf(endMarker)
+    const slowAsyncPayloadIndex = html.indexOf('"slow-async-3"')
+    const lastScriptOpen = html.lastIndexOf('<script', endIndex)
+    const lastScriptClose = html.lastIndexOf('</script>', endIndex)
+
+    expect(endIndex).toBeGreaterThan(-1)
+    expect(lastScriptOpen).toBeGreaterThan(lastScriptClose)
+    expect(slowAsyncPayloadIndex).toBeGreaterThan(-1)
+    expect(slowAsyncPayloadIndex).toBeLessThan(endIndex)
+    expect(html.slice(lastScriptOpen, endIndex)).toContain('.return(void 0)')
+    expect(endIndex).toBeLessThan(html.indexOf('</body>'))
+  })
 })
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-BwsVWHwV.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-BwsVWHwV.js
deleted file mode 100644
index 1f78534259..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-BwsVWHwV.js
+++ /dev/null
@@ -1,18 +0,0 @@
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Promise.all(s).then(()=>{e._componentsLoaded=!0,e._componentsPromise=void 0});e._componentsLoaded=!0,e._componentsPromise=void 0};e._componentsPromise=e._lazyPromise?e._lazyPromise.then(t):t()}return e._componentsPromise}function tn(e,t){return t?{status:"error",error:t}:{status:"success",value:e}}function ja(e){for(const t of Da)if(e.options[t]?.preload)return!0;return!1}const Da=["component","errorComponent","pendingComponent","notFoundComponent"];function xf(e){return{input:({url:t})=>{for(const s of e)t=Va(s,t);return t},output:({url:t})=>{for(let s=e.length-1;s>=0;s--)t=Ua(e[s],t);return t}}}function wf(e){const t=Ea(e.basepath),s=`/${t}`,n=`${s}/`,r=e.caseSensitive?s:s.toLowerCase(),i=e.caseSensitive?n:n.toLowerCase();return{input:({url:o})=>{const a=e.caseSensitive?o.pathname:o.pathname.toLowerCase();return a===r?o.pathname="/":a.startsWith(i)&&(o.pathname=o.pathname.slice(s.length)),o},output:({url:o})=>(o.pathname=rn(["/",t,o.pathname]),o)}}function Va(e,t){const s=e?.input?.({url:t});if(s){if(typeof s=="string")return new URL(s);if(s instanceof URL)return s}return t}function Ua(e,t){const s=e?.output?.({url:t});if(s){if(typeof s=="string")return new URL(s);if(s instanceof URL)return s}return t}function jt(e){const t=e.resolvedLocation,s=e.location,n=t?.pathname!==s.pathname,r=t?.href!==s.href,i=t?.hash!==s.hash;return{fromLocation:t,toLocation:s,pathChanged:n,hrefChanged:r,hashChanged:i}}class Sf{constructor(t){this.tempLocationKey=`${Math.round(Math.random()*1e7)}`,this.resetNextScroll=!0,this.shouldViewTransition=void 0,this.isViewTransitionTypesSupported=void 0,this.subscribers=new Set,this.isScrollRestoring=!1,this.isScrollRestorationSetup=!1,this.startTransition=s=>s(),this.update=s=>{s.notFoundRoute&&console.warn("The notFoundRoute API is deprecated and will be removed in the next major version. See https://tanstack.com/router/v1/docs/framework/react/guide/not-found-errors#migrating-from-notfoundroute for more info.");const n=this.options,r=this.basepath??n?.basepath??"/",i=this.basepath===void 0,o=n?.rewrite;this.options={...n,...s},this.isServer=this.options.isServer??typeof document>"u",this.pathParamsDecodeCharMap=this.options.pathParamsAllowedCharacters?new Map(this.options.pathParamsAllowedCharacters.map(d=>[encodeURIComponent(d),d])):void 0,(!this.history||this.options.history&&this.options.history!==this.history)&&(this.options.history?this.history=this.options.history:this.isServer||(this.history=La())),this.origin=this.options.origin,this.origin||(!this.isServer&&window?.origin&&window.origin!=="null"?this.origin=window.origin:this.origin="http://localhost"),this.history&&this.updateLatestLocation(),this.options.routeTree!==this.routeTree&&(this.routeTree=this.options.routeTree,this.buildRouteTree()),!this.__store&&this.latestLocation&&(this.__store=new Au(Cf(this.latestLocation),{onUpdate:()=>{this.__store.state={...this.state,cachedMatches:this.state.cachedMatches.filter(d=>!["redirected"].includes(d.status))}}}),af(this));let a=!1;const c=this.options.basepath??"/",u=this.options.rewrite;if(i||r!==c||o!==u){this.basepath=c;const d=[];Ea(c)!==""&&d.push(wf({basepath:c})),u&&d.push(u),this.rewrite=d.length===0?void 0:d.length===1?d[0]:xf(d),this.history&&this.updateLatestLocation(),a=!0}a&&this.__store&&(this.__store.state={...this.state,location:this.latestLocation}),typeof window<"u"&&"CSS"in window&&typeof window.CSS?.supports=="function"&&(this.isViewTransitionTypesSupported=window.CSS.supports("selector(:active-view-transition-type(a)"))},this.updateLatestLocation=()=>{this.latestLocation=this.parseLocation(this.history.location,this.latestLocation)},this.buildRouteTree=()=>{const{routesById:s,routesByPath:n,processedTree:r}=qu(this.routeTree,this.options.caseSensitive,(o,a)=>{o.init({originalIndex:a})});this.options.routeMasks&&Hu(this.options.routeMasks,r),this.routesById=s,this.routesByPath=n,this.processedTree=r;const i=this.options.notFoundRoute;i&&(i.init({originalIndex:99999999999}),this.routesById[i.id]=i)},this.subscribe=(s,n)=>{const r={eventType:s,fn:n};return this.subscribers.add(r),()=>{this.subscribers.delete(r)}},this.emit=s=>{this.subscribers.forEach(n=>{n.eventType===s.type&&n.fn(s)})},this.parseLocation=(s,n)=>{const r=({href:c,state:u})=>{const f=new URL(c,this.origin),l=Va(this.rewrite,f),d=this.options.parseSearch(l.search),h=this.options.stringifySearch(d);return l.search=h,{href:l.href.replace(l.origin,""),publicHref:c,url:l,pathname:io(l.pathname),searchStr:h,search:je(n?.search,d),hash:l.hash.split("#").reverse()[0]??"",state:je(n?.state,u)}},i=r(s),{__tempLocation:o,__tempKey:a}=i.state;if(o&&(!a||a===this.tempLocationKey)){const c=r(o);return c.state.key=i.state.key,c.state.__TSR_key=i.state.__TSR_key,delete c.state.__tempLocation,{...c,maskedLocation:i}}return i},this.resolvePathCache=_n(1e3),this.resolvePathWithBase=(s,n)=>ef({base:s,to:li(n),trailingSlash:this.options.trailingSlash,cache:this.resolvePathCache}),this.matchRoutes=(s,n,r)=>typeof s=="string"?this.matchRoutesInternal({pathname:s,search:n},r):this.matchRoutesInternal(s,n),this.getMatchedRoutes=s=>Pf({pathname:s,routesById:this.routesById,processedTree:this.processedTree}),this.cancelMatch=s=>{const n=this.getMatch(s);n&&(n.abortController.abort(),clearTimeout(n._nonReactive.pendingTimeout),n._nonReactive.pendingTimeout=void 0)},this.cancelMatches=()=>{const s=this.state.matches.filter(i=>i.status==="pending"),n=this.state.matches.filter(i=>i.isFetching==="loader");new Set([...this.state.pendingMatches??[],...s,...n]).forEach(i=>{this.cancelMatch(i.id)})},this.buildLocation=s=>{const n=(i={})=>{const o=i._fromLocation||this.pendingBuiltLocation||this.latestLocation,a=this.matchRoutes(o,{_buildLocation:!0}),c=vn(a);i.from;const u=i.unsafeRelative==="path"?o.pathname:i.from??c.fullPath,f=this.resolvePathWithBase(u,"."),l=c.search,d={...c.params},h=i.to?this.resolvePathWithBase(f,`${i.to}`):this.resolvePathWithBase(f,"."),g=i.params===!1||i.params===null?{}:(i.params??!0)===!0?d:Object.assign(d,Gt(i.params,d)),y=sr({path:h,params:g}).interpolatedPath,x=this.matchRoutes(y,void 0,{_buildLocation:!0}).map(W=>this.looseRoutesById[W.routeId]);if(Object.keys(g).length>0)for(const W of x){const J=W.options.params?.stringify??W.options.stringifyParams;J&&Object.assign(g,J(g))}const b=s.leaveParams?h:io(sr({path:h,params:g,decodeCharMap:this.pathParamsDecodeCharMap}).interpolatedPath);let L=l;if(s._includeValidateSearch&&this.options.search?.strict){const W={};x.forEach(J=>{if(J.options.validateSearch)try{Object.assign(W,kr(J.options.validateSearch,{...W,...L}))}catch{}}),L=W}L=kf({search:L,dest:i,destRoutes:x,_includeValidateSearch:s._includeValidateSearch}),L=je(l,L);const $=this.options.stringifySearch(L),C=i.hash===!0?o.hash:i.hash?Gt(i.hash,o.hash):void 0,k=C?`#${C}`:"";let _=i.state===!0?o.state:i.state?Gt(i.state,o.state):{};_=je(o.state,_);const D=`${b}${$}${k}`,M=new URL(D,this.origin),B=Ua(this.rewrite,M);return{publicHref:B.pathname+B.search+B.hash,href:D,url:B,pathname:b,search:L,searchStr:$,state:_,hash:C??"",unmaskOnReload:i.unmaskOnReload}},r=(i={},o)=>{const a=n(i);let c=o?n(o):void 0;if(!c){const u={};if(this.options.routeMasks){const f=Zu(a.pathname,this.processedTree);if(f){Object.assign(u,f.params);const{from:l,params:d,...h}=f.route,g=d===!1||d===null?{}:(d??!0)===!0?u:Object.assign(u,Gt(d,u));o={from:s.from,...h,params:g},c=n(o)}}}return c&&(a.maskedLocation=c),a};return s.mask?r(s,{from:s.from,...s.mask}):r(s)},this.commitLocation=({viewTransition:s,ignoreBlocker:n,...r})=>{const i=()=>{const c=["key","__TSR_key","__TSR_index","__hashScrollIntoViewOptions"];c.forEach(f=>{r.state[f]=this.latestLocation.state[f]});const u=$t(r.state,this.latestLocation.state);return c.forEach(f=>{delete r.state[f]}),u},o=Bt(this.latestLocation.href)===Bt(r.href),a=this.commitLocationPromise;if(this.commitLocationPromise=ts(()=>{a?.resolve()}),o&&i())this.load();else{let{maskedLocation:c,hashScrollIntoView:u,url:f,...l}=r;c&&(l={...c,state:{...c.state,__tempKey:void 0,__tempLocation:{...l,search:l.searchStr,state:{...l.state,__tempKey:void 0,__tempLocation:void 0,__TSR_key:void 0,key:void 0}}}},(l.unmaskOnReload??this.options.unmaskOnReload??!1)&&(l.state.__tempKey=this.tempLocationKey)),l.state.__hashScrollIntoViewOptions=u??this.options.defaultHashScrollIntoView??!0,this.shouldViewTransition=s,this.history[r.replace?"replace":"push"](l.publicHref,l.state,{ignoreBlocker:n})}return this.resetNextScroll=r.resetScroll??!0,this.history.subscribers.size||this.load(),this.commitLocationPromise},this.buildAndCommitLocation=({replace:s,resetScroll:n,hashScrollIntoView:r,viewTransition:i,ignoreBlocker:o,href:a,...c}={})=>{if(a){const l=this.history.location.state.__TSR_index,d=Bs(a,{__TSR_index:s?l:l+1});c.to=d.pathname,c.search=this.options.parseSearch(d.search),c.hash=d.hash.slice(1)}const u=this.buildLocation({...c,_includeValidateSearch:!0});this.pendingBuiltLocation=u;const f=this.commitLocation({...u,viewTransition:i,replace:s,resetScroll:n,hashScrollIntoView:r,ignoreBlocker:o});return Promise.resolve().then(()=>{this.pendingBuiltLocation===u&&(this.pendingBuiltLocation=void 0)}),f},this.navigate=async({to:s,reloadDocument:n,href:r,...i})=>{if(!n&&r)try{new URL(`${r}`),n=!0}catch{}if(n){if(r||(r=this.buildLocation({to:s,...i}).url.href),!i.ignoreBlocker){const a=this.history.getBlockers?.()??[];for(const c of a)if(c?.blockerFn&&await c.blockerFn({currentLocation:this.latestLocation,nextLocation:this.latestLocation,action:"PUSH"}))return Promise.resolve()}return i.replace?window.location.replace(r):window.location.href=r,Promise.resolve()}return this.buildAndCommitLocation({...i,href:r,to:s,_isNavigate:!0})},this.beforeLoad=()=>{if(this.cancelMatches(),this.updateLatestLocation(),this.isServer){const n=this.buildLocation({to:this.latestLocation.pathname,search:!0,params:!0,hash:!0,state:!0,_includeValidateSearch:!0});if(this.latestLocation.publicHref!==n.publicHref||n.url.origin!==this.origin){const r=this.getParsedLocationHref(n);throw mf({href:r})}}const s=this.matchRoutes(this.latestLocation);this.__store.setState(n=>({...n,status:"pending",statusCode:200,isLoading:!0,location:this.latestLocation,pendingMatches:s,cachedMatches:n.cachedMatches.filter(r=>!s.some(i=>i.id===r.id))}))},this.load=async s=>{let n,r,i;for(i=new Promise(a=>{this.startTransition(async()=>{try{this.beforeLoad();const c=this.latestLocation,u=this.state.resolvedLocation;this.state.redirect||this.emit({type:"onBeforeNavigate",...jt({resolvedLocation:u,location:c})}),this.emit({type:"onBeforeLoad",...jt({resolvedLocation:u,location:c})}),await ao({router:this,sync:s?.sync,matches:this.state.pendingMatches,location:c,updateMatch:this.updateMatch,onReady:async()=>{this.startTransition(()=>{this.startViewTransition(async()=>{let f=[],l=[],d=[];Is(()=>{this.__store.setState(h=>{const g=h.matches,y=h.pendingMatches||h.matches;return f=g.filter(x=>!y.some(b=>b.id===x.id)),l=y.filter(x=>!g.some(b=>b.id===x.id)),d=y.filter(x=>g.some(b=>b.id===x.id)),{...h,isLoading:!1,loadedAt:Date.now(),matches:y,pendingMatches:void 0,cachedMatches:[...h.cachedMatches,...f.filter(x=>x.status!=="error"&&x.status!=="notFound")]}}),this.clearExpiredCache()}),[[f,"onLeave"],[l,"onEnter"],[d,"onStay"]].forEach(([h,g])=>{h.forEach(y=>{this.looseRoutesById[y.routeId].options[g]?.(y)})})})})}})}catch(c){Ue(c)?(n=c,this.isServer||this.navigate({...n.options,replace:!0,ignoreBlocker:!0})):$e(c)&&(r=c),this.__store.setState(u=>({...u,statusCode:n?n.status:r?404:u.matches.some(f=>f.status==="error")?500:200,redirect:n}))}this.latestLoadPromise===i&&(this.commitLocationPromise?.resolve(),this.latestLoadPromise=void 0,this.commitLocationPromise=void 0),a()})}),this.latestLoadPromise=i,await i;this.latestLoadPromise&&i!==this.latestLoadPromise;)await this.latestLoadPromise;let o;this.hasNotFoundMatch()?o=404:this.__store.state.matches.some(a=>a.status==="error")&&(o=500),o!==void 0&&this.__store.setState(a=>({...a,statusCode:o}))},this.startViewTransition=s=>{const n=this.shouldViewTransition??this.options.defaultViewTransition;if(delete this.shouldViewTransition,n&&typeof document<"u"&&"startViewTransition"in document&&typeof document.startViewTransition=="function"){let r;if(typeof n=="object"&&this.isViewTransitionTypesSupported){const i=this.latestLocation,o=this.state.resolvedLocation,a=typeof n.types=="function"?n.types(jt({resolvedLocation:o,location:i})):n.types;if(a===!1){s();return}r={update:s,types:a}}else r=s;document.startViewTransition(r)}else s()},this.updateMatch=(s,n)=>{this.startTransition(()=>{const r=this.state.pendingMatches?.some(i=>i.id===s)?"pendingMatches":this.state.matches.some(i=>i.id===s)?"matches":this.state.cachedMatches.some(i=>i.id===s)?"cachedMatches":"";r&&this.__store.setState(i=>({...i,[r]:i[r]?.map(o=>o.id===s?n(o):o)}))})},this.getMatch=s=>{const n=r=>r.id===s;return this.state.cachedMatches.find(n)??this.state.pendingMatches?.find(n)??this.state.matches.find(n)},this.invalidate=s=>{const n=r=>s?.filter?.(r)??!0?{...r,invalid:!0,...s?.forcePending||r.status==="error"||r.status==="notFound"?{status:"pending",error:void 0}:void 0}:r;return this.__store.setState(r=>({...r,matches:r.matches.map(n),cachedMatches:r.cachedMatches.map(n),pendingMatches:r.pendingMatches?.map(n)})),this.shouldViewTransition=!1,this.load({sync:s?.sync})},this.getParsedLocationHref=s=>{let n=s.url.href;return this.origin&&s.url.origin===this.origin&&(n=n.replace(this.origin,"")||"/"),n},this.resolveRedirect=s=>{if(!s.options.href){const n=this.buildLocation(s.options),r=this.getParsedLocationHref(n);s.options.href=n.href,s.headers.set("Location",r)}return s.headers.get("Location")||s.headers.set("Location",s.options.href),s},this.clearCache=s=>{const n=s?.filter;n!==void 0?this.__store.setState(r=>({...r,cachedMatches:r.cachedMatches.filter(i=>!n(i))})):this.__store.setState(r=>({...r,cachedMatches:[]}))},this.clearExpiredCache=()=>{const s=n=>{const r=this.looseRoutesById[n.routeId];if(!r.options.loader)return!0;const i=(n.preload?r.options.preloadGcTime??this.options.defaultPreloadGcTime:r.options.gcTime??this.options.defaultGcTime)??300*1e3;return n.status==="error"?!0:Date.now()-n.updatedAt>=i};this.clearCache({filter:s})},this.loadRouteChunk=Ba,this.preloadRoute=async s=>{const n=this.buildLocation(s);let r=this.matchRoutes(n,{throwOnError:!0,preload:!0,dest:s});const i=new Set([...this.state.matches,...this.state.pendingMatches??[]].map(a=>a.id)),o=new Set([...i,...this.state.cachedMatches.map(a=>a.id)]);Is(()=>{r.forEach(a=>{o.has(a.id)||this.__store.setState(c=>({...c,cachedMatches:[...c.cachedMatches,a]}))})});try{return r=await ao({router:this,matches:r,location:n,preload:!0,updateMatch:(a,c)=>{i.has(a)?r=r.map(u=>u.id===a?c(u):u):this.updateMatch(a,c)}}),r}catch(a){if(Ue(a))return a.options.reloadDocument?void 0:await this.preloadRoute({...a.options,_fromLocation:n});$e(a)||console.error(a);return}},this.matchRoute=(s,n)=>{const r={...s,to:s.to?this.resolvePathWithBase(s.from||"",s.to):void 0,params:s.params||{},leaveParams:!0},i=this.buildLocation(r);if(n?.pending&&this.state.status!=="pending")return!1;const a=(n?.pending===void 0?!this.state.isLoading:n.pending)?this.latestLocation:this.state.resolvedLocation||this.state.location,c=Wu(i.pathname,n?.caseSensitive??!1,n?.fuzzy??!1,a.pathname,this.processedTree);return!c||s.params&&!$t(c.params,s.params,{partial:!0})?!1:n?.includeSearch??!0?$t(a.search,i.search,{partial:!0})?c.params:!1:c.params},this.hasNotFoundMatch=()=>this.__store.state.matches.some(s=>s.status==="notFound"||s.globalNotFound),this.update({defaultPreloadDelay:50,defaultPendingMs:1e3,defaultPendingMinMs:500,context:void 0,...t,caseSensitive:t.caseSensitive??!1,notFoundMode:t.notFoundMode??"fuzzy",stringifySearch:t.stringifySearch??df,parseSearch:t.parseSearch??ff}),typeof document<"u"&&(self.__TSR_ROUTER__=this)}isShell(){return!!this.options.isShell}isPrerendering(){return!!this.options.isPrerendering}get state(){return this.__store.state}get looseRoutesById(){return this.routesById}matchRoutesInternal(t,s){const n=this.getMatchedRoutes(t.pathname),{foundRoute:r,routeParams:i}=n;let{matchedRoutes:o}=n,a=!1;(r?r.path!=="/"&&i["**"]:Bt(t.pathname))&&(this.options.notFoundRoute?o=[...o,this.options.notFoundRoute]:a=!0);const c=(()=>{if(a){if(this.options.notFoundMode!=="root")for(let l=o.length-1;l>=0;l--){const d=o[l];if(d.children)return d.id}return Ne}})(),u=[],f=l=>l?.id?l.context??this.options.context??void 0:this.options.context??void 0;return o.forEach((l,d)=>{const h=u[d-1],[g,y,x]=(()=>{const P=h?.search??t.search,H=h?._strictSearch??void 0;try{const te=kr(l.options.validateSearch,{...P})??void 0;return[{...P,...te},{...H,...te},void 0]}catch(te){let Q=te;if(te instanceof Sn||(Q=new Sn(te.message,{cause:te})),s?.throwOnError)throw Q;return[P,{},Q]}})(),b=l.options.loaderDeps?.({search:g})??"",L=b?JSON.stringify(b):"",{interpolatedPath:$,usedParams:C}=sr({path:l.fullPath,params:i,decodeCharMap:this.pathParamsDecodeCharMap}),k=l.id+$+L,_=this.getMatch(k),D=this.state.matches.find(P=>P.routeId===l.id),M=_?._strictParams??C;let B;if(!_){const P=l.options.params?.parse??l.options.parseParams;if(P)try{Object.assign(M,P(M))}catch(H){if($e(H)||Ue(H)?B=H:B=new Rf(H.message,{cause:H}),s?.throwOnError)throw B}}Object.assign(i,M);const W=D?"stay":"enter";let J;if(_)J={..._,cause:W,params:D?je(D.params,i):i,_strictParams:M,search:je(D?D.search:_.search,g),_strictSearch:y};else{const P=l.options.loader||l.options.beforeLoad||l.lazyFn||ja(l)?"pending":"success";J={id:k,ssr:this.isServer?void 0:l.options.ssr,index:d,routeId:l.id,params:D?je(D.params,i):i,_strictParams:M,pathname:$,updatedAt:Date.now(),search:D?je(D.search,g):g,_strictSearch:y,searchError:void 0,status:P,isFetching:!1,error:void 0,paramsError:B,__routeContext:void 0,_nonReactive:{loadPromise:ts()},__beforeLoadContext:void 0,context:{},abortController:new AbortController,fetchCount:0,cause:W,loaderDeps:D?je(D.loaderDeps,b):b,invalid:!1,preload:!1,links:void 0,scripts:void 0,headScripts:void 0,meta:void 0,staticData:l.options.staticData||{},fullPath:l.fullPath}}s?.preload||(J.globalNotFound=c===l.id),J.searchError=x;const de=f(h);J.context={...de,...J.__routeContext,...J.__beforeLoadContext},u.push(J)}),u.forEach((l,d)=>{const h=this.looseRoutesById[l.routeId];if(!this.getMatch(l.id)&&s?._buildLocation!==!0){const y=u[d-1],x=f(y);if(h.options.context){const b={deps:l.loaderDeps,params:l.params,context:x??{},location:t,navigate:L=>this.navigate({...L,_fromLocation:t}),buildLocation:this.buildLocation,cause:l.cause,abortController:l.abortController,preload:!!l.preload,matches:u};l.__routeContext=h.options.context(b)??void 0}l.context={...x,...l.__routeContext,...l.__beforeLoadContext}}}),u}}class Sn extends 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It{constructor(t,s,n,r){this._cachedPath=[],this.parent=t,this.data=s,this._path=n,this._key=r}get path(){return this._cachedPath.length||(Array.isArray(this._key)?this._cachedPath.push(...this._path,...this._key):this._cachedPath.push(...this._path,this._key)),this._cachedPath}}const _o=(e,t)=>{if(ns(t))return{success:!0,data:t.value};if(!e.common.issues.length)throw new Error("Validation failed but no issues detected.");return{success:!1,get error(){if(this._error)return this._error;const s=new ft(e.common.issues);return this._error=s,this._error}}};function ee(e){if(!e)return{};const{errorMap:t,invalid_type_error:s,required_error:n,description:r}=e;if(t&&(s||n))throw new Error(`Can't use "invalid_type_error" or "required_error" in conjunction with custom error map.`);return t?{errorMap:t,description:r}:{errorMap:(o,a)=>{const{message:c}=e;return o.code==="invalid_enum_value"?{message:c??a.defaultError}:typeof 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n={common:{issues:[],async:s?.async??!1,contextualErrorMap:s?.errorMap},path:s?.path||[],schemaErrorMap:this._def.errorMap,parent:null,data:t,parsedType:gt(t)},r=this._parseSync({data:t,path:n.path,parent:n});return _o(n,r)}"~validate"(t){const s={common:{issues:[],async:!!this["~standard"].async},path:[],schemaErrorMap:this._def.errorMap,parent:null,data:t,parsedType:gt(t)};if(!this["~standard"].async)try{const n=this._parseSync({data:t,path:[],parent:s});return ns(n)?{value:n.value}:{issues:s.common.issues}}catch(n){n?.message?.toLowerCase()?.includes("encountered")&&(this["~standard"].async=!0),s.common={issues:[],async:!0}}return this._parseAsync({data:t,path:[],parent:s}).then(n=>ns(n)?{value:n.value}:{issues:s.common.issues})}async parseAsync(t,s){const n=await this.safeParseAsync(t,s);if(n.success)return n.data;throw n.error}async safeParseAsync(t,s){const n={common:{issues:[],contextualErrorMap:s?.errorMap,async:!0},path:s?.path||[],schemaErrorMap:this._def.errorMap,parent:null,data:t,parsedType:gt(t)},r=this._parse({data:t,path:n.path,parent:n}),i=await(Rn(r)?r:Promise.resolve(r));return _o(n,i)}refine(t,s){const n=r=>typeof s=="string"||typeof s>"u"?{message:s}:typeof s=="function"?s(r):s;return this._refinement((r,i)=>{const o=t(r),a=()=>i.addIssue({code:I.custom,...n(r)});return typeof Promise<"u"&&o instanceof Promise?o.then(c=>c?!0:(a(),!1)):o?!0:(a(),!1)})}refinement(t,s){return this._refinement((n,r)=>t(n)?!0:(r.addIssue(typeof s=="function"?s(n,r):s),!1))}_refinement(t){return new is({schema:this,typeName:G.ZodEffects,effect:{type:"refinement",refinement:t}})}superRefine(t){return 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RegExp(`^${Ga}$`);function Ja(e){let t="[0-5]\\d";e.precision?t=`${t}\\.\\d{${e.precision}}`:e.precision==null&&(t=`${t}(\\.\\d+)?`);const s=e.precision?"+":"?";return`([01]\\d|2[0-3]):[0-5]\\d(:${t})${s}`}function Bd(e){return new RegExp(`^${Ja(e)}$`)}function jd(e){let t=`${Ga}T${Ja(e)}`;const s=[];return s.push(e.local?"Z?":"Z"),e.offset&&s.push("([+-]\\d{2}:?\\d{2})"),t=`${t}(${s.join("|")})`,new RegExp(`^${t}$`)}function Dd(e,t){return!!((t==="v4"||!t)&&Md.test(e)||(t==="v6"||!t)&&Od.test(e))}function Vd(e,t){if(!kd.test(e))return!1;try{const[s]=e.split("."),n=s.replace(/-/g,"+").replace(/_/g,"/").padEnd(s.length+(4-s.length%4)%4,"="),r=JSON.parse(atob(n));return!(typeof r!="object"||r===null||"typ"in r&&r?.typ!=="JWT"||!r.alg||t&&r.alg!==t)}catch{return!1}}function Ud(e,t){return!!((t==="v4"||!t)&&Ed.test(e)||(t==="v6"||!t)&&Ad.test(e))}class bt extends ne{_parse(t){if(this._def.coerce&&(t.data=String(t.data)),this._getType(t)!==V.string){const i=this._getOrReturnCtx(t);return 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this.refinement(r=>t.test(r),{validation:s,code:I.invalid_string,...U.errToObj(n)})}_addCheck(t){return new bt({...this._def,checks:[...this._def.checks,t]})}email(t){return this._addCheck({kind:"email",...U.errToObj(t)})}url(t){return this._addCheck({kind:"url",...U.errToObj(t)})}emoji(t){return this._addCheck({kind:"emoji",...U.errToObj(t)})}uuid(t){return this._addCheck({kind:"uuid",...U.errToObj(t)})}nanoid(t){return this._addCheck({kind:"nanoid",...U.errToObj(t)})}cuid(t){return this._addCheck({kind:"cuid",...U.errToObj(t)})}cuid2(t){return this._addCheck({kind:"cuid2",...U.errToObj(t)})}ulid(t){return this._addCheck({kind:"ulid",...U.errToObj(t)})}base64(t){return this._addCheck({kind:"base64",...U.errToObj(t)})}base64url(t){return this._addCheck({kind:"base64url",...U.errToObj(t)})}jwt(t){return this._addCheck({kind:"jwt",...U.errToObj(t)})}ip(t){return this._addCheck({kind:"ip",...U.errToObj(t)})}cidr(t){return this._addCheck({kind:"cidr",...U.errToObj(t)})}datetime(t){return typeof t=="string"?this._addCheck({kind:"datetime",precision:null,offset:!1,local:!1,message:t}):this._addCheck({kind:"datetime",precision:typeof t?.precision>"u"?null:t?.precision,offset:t?.offset??!1,local:t?.local??!1,...U.errToObj(t?.message)})}date(t){return this._addCheck({kind:"date",message:t})}time(t){return typeof t=="string"?this._addCheck({kind:"time",precision:null,message:t}):this._addCheck({kind:"time",precision:typeof t?.precision>"u"?null:t?.precision,...U.errToObj(t?.message)})}duration(t){return this._addCheck({kind:"duration",...U.errToObj(t)})}regex(t,s){return this._addCheck({kind:"regex",regex:t,...U.errToObj(s)})}includes(t,s){return this._addCheck({kind:"includes",value:t,position:s?.position,...U.errToObj(s?.message)})}startsWith(t,s){return this._addCheck({kind:"startsWith",value:t,...U.errToObj(s)})}endsWith(t,s){return this._addCheck({kind:"endsWith",value:t,...U.errToObj(s)})}min(t,s){return this._addCheck({kind:"min",value:t,...U.errToObj(s)})}max(t,s){return this._addCheck({kind:"max",value:t,...U.errToObj(s)})}length(t,s){return this._addCheck({kind:"length",value:t,...U.errToObj(s)})}nonempty(t){return this.min(1,U.errToObj(t))}trim(){return new bt({...this._def,checks:[...this._def.checks,{kind:"trim"}]})}toLowerCase(){return new bt({...this._def,checks:[...this._def.checks,{kind:"toLowerCase"}]})}toUpperCase(){return new bt({...this._def,checks:[...this._def.checks,{kind:"toUpperCase"}]})}get isDatetime(){return!!this._def.checks.find(t=>t.kind==="datetime")}get isDate(){return!!this._def.checks.find(t=>t.kind==="date")}get isTime(){return!!this._def.checks.find(t=>t.kind==="time")}get isDuration(){return!!this._def.checks.find(t=>t.kind==="duration")}get isEmail(){return!!this._def.checks.find(t=>t.kind==="email")}get isURL(){return!!this._def.checks.find(t=>t.kind==="url")}get isEmoji(){return!!this._def.checks.find(t=>t.kind==="emoji")}get isUUID(){return!!this._def.checks.find(t=>t.kind==="uuid")}get isNANOID(){return!!this._def.checks.find(t=>t.kind==="nanoid")}get isCUID(){return!!this._def.checks.find(t=>t.kind==="cuid")}get isCUID2(){return!!this._def.checks.find(t=>t.kind==="cuid2")}get isULID(){return!!this._def.checks.find(t=>t.kind==="ulid")}get isIP(){return!!this._def.checks.find(t=>t.kind==="ip")}get isCIDR(){return!!this._def.checks.find(t=>t.kind==="cidr")}get isBase64(){return!!this._def.checks.find(t=>t.kind==="base64")}get isBase64url(){return!!this._def.checks.find(t=>t.kind==="base64url")}get minLength(){let t=null;for(const s of this._def.checks)s.kind==="min"&&(t===null||s.value>t)&&(t=s.value);return t}get maxLength(){let t=null;for(const s of this._def.checks)s.kind==="max"&&(t===null||s.value<t)&&(t=s.value);return t}}bt.create=e=>new bt({checks:[],typeName:G.ZodString,coerce:e?.coerce??!1,...ee(e)});function Hd(e,t){const s=(e.toString().split(".")[1]||"").length,n=(t.toString().split(".")[1]||"").length,r=s>n?s:n,i=Number.parseInt(e.toFixed(r).replace(".","")),o=Number.parseInt(t.toFixed(r).replace(".",""));return i%o/10**r}class Vs extends ne{constructor(){super(...arguments),this.min=this.gte,this.max=this.lte,this.step=this.multipleOf}_parse(t){if(this._def.coerce&&(t.data=Number(t.data)),this._getType(t)!==V.number){const i=this._getOrReturnCtx(t);return N(i,{code:I.invalid_type,expected:V.number,received:i.parsedType}),q}let n;const r=new Ae;for(const i of this._def.checks)i.kind==="int"?re.isInteger(t.data)||(n=this._getOrReturnCtx(t,n),N(n,{code:I.invalid_type,expected:"integer",received:"float",message:i.message}),r.dirty()):i.kind==="min"?(i.inclusive?t.data<i.value:t.data<=i.value)&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.too_small,minimum:i.value,type:"number",inclusive:i.inclusive,exact:!1,message:i.message}),r.dirty()):i.kind==="max"?(i.inclusive?t.data>i.value:t.data>=i.value)&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.too_big,maximum:i.value,type:"number",inclusive:i.inclusive,exact:!1,message:i.message}),r.dirty()):i.kind==="multipleOf"?Hd(t.data,i.value)!==0&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.not_multiple_of,multipleOf:i.value,message:i.message}),r.dirty()):i.kind==="finite"?Number.isFinite(t.data)||(n=this._getOrReturnCtx(t,n),N(n,{code:I.not_finite,message:i.message}),r.dirty()):re.assertNever(i);return{status:r.value,value:t.data}}gte(t,s){return this.setLimit("min",t,!0,U.toString(s))}gt(t,s){return this.setLimit("min",t,!1,U.toString(s))}lte(t,s){return this.setLimit("max",t,!0,U.toString(s))}lt(t,s){return this.setLimit("max",t,!1,U.toString(s))}setLimit(t,s,n,r){return new Vs({...this._def,checks:[...this._def.checks,{kind:t,value:s,inclusive:n,message:U.toString(r)}]})}_addCheck(t){return new Vs({...this._def,checks:[...this._def.checks,t]})}int(t){return this._addCheck({kind:"int",message:U.toString(t)})}positive(t){return this._addCheck({kind:"min",value:0,inclusive:!1,message:U.toString(t)})}negative(t){return this._addCheck({kind:"max",value:0,inclusive:!1,message:U.toString(t)})}nonpositive(t){return this._addCheck({kind:"max",value:0,inclusive:!0,message:U.toString(t)})}nonnegative(t){return this._addCheck({kind:"min",value:0,inclusive:!0,message:U.toString(t)})}multipleOf(t,s){return this._addCheck({kind:"multipleOf",value:t,message:U.toString(s)})}finite(t){return this._addCheck({kind:"finite",message:U.toString(t)})}safe(t){return this._addCheck({kind:"min",inclusive:!0,value:Number.MIN_SAFE_INTEGER,message:U.toString(t)})._addCheck({kind:"max",inclusive:!0,value:Number.MAX_SAFE_INTEGER,message:U.toString(t)})}get minValue(){let t=null;for(const s of this._def.checks)s.kind==="min"&&(t===null||s.value>t)&&(t=s.value);return t}get maxValue(){let t=null;for(const s of this._def.checks)s.kind==="max"&&(t===null||s.value<t)&&(t=s.value);return t}get isInt(){return!!this._def.checks.find(t=>t.kind==="int"||t.kind==="multipleOf"&&re.isInteger(t.value))}get isFinite(){let t=null,s=null;for(const n of this._def.checks){if(n.kind==="finite"||n.kind==="int"||n.kind==="multipleOf")return!0;n.kind==="min"?(s===null||n.value>s)&&(s=n.value):n.kind==="max"&&(t===null||n.value<t)&&(t=n.value)}return Number.isFinite(s)&&Number.isFinite(t)}}Vs.create=e=>new Vs({checks:[],typeName:G.ZodNumber,coerce:e?.coerce||!1,...ee(e)});class Us extends ne{constructor(){super(...arguments),this.min=this.gte,this.max=this.lte}_parse(t){if(this._def.coerce)try{t.data=BigInt(t.data)}catch{return this._getInvalidInput(t)}if(this._getType(t)!==V.bigint)return this._getInvalidInput(t);let n;const r=new Ae;for(const i of this._def.checks)i.kind==="min"?(i.inclusive?t.data<i.value:t.data<=i.value)&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.too_small,type:"bigint",minimum:i.value,inclusive:i.inclusive,message:i.message}),r.dirty()):i.kind==="max"?(i.inclusive?t.data>i.value:t.data>=i.value)&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.too_big,type:"bigint",maximum:i.value,inclusive:i.inclusive,message:i.message}),r.dirty()):i.kind==="multipleOf"?t.data%i.value!==BigInt(0)&&(n=this._getOrReturnCtx(t,n),N(n,{code:I.not_multiple_of,multipleOf:i.value,message:i.message}),r.dirty()):re.assertNever(i);return{status:r.value,value:t.data}}_getInvalidInput(t){const s=this._getOrReturnCtx(t);return N(s,{code:I.invalid_type,expected:V.bigint,received:s.parsedType}),q}gte(t,s){return this.setLimit("min",t,!0,U.toString(s))}gt(t,s){return this.setLimit("min",t,!1,U.toString(s))}lte(t,s){return this.setLimit("max",t,!0,U.toString(s))}lt(t,s){return this.setLimit("max",t,!1,U.toString(s))}setLimit(t,s,n,r){return new Us({...this._def,checks:[...this._def.checks,{kind:t,value:s,inclusive:n,message:U.toString(r)}]})}_addCheck(t){return new Us({...this._def,checks:[...this._def.checks,t]})}positive(t){return this._addCheck({kind:"min",value:BigInt(0),inclusive:!1,message:U.toString(t)})}negative(t){return this._addCheck({kind:"max",value:BigInt(0),inclusive:!1,message:U.toString(t)})}nonpositive(t){return this._addCheck({kind:"max",value:BigInt(0),inclusive:!0,message:U.toString(t)})}nonnegative(t){return this._addCheck({kind:"min",value:BigInt(0),inclusive:!0,message:U.toString(t)})}multipleOf(t,s){return this._addCheck({kind:"multipleOf",value:t,message:U.toString(s)})}get minValue(){let t=null;for(const s of this._def.checks)s.kind==="min"&&(t===null||s.value>t)&&(t=s.value);return t}get maxValue(){let t=null;for(const s of this._def.checks)s.kind==="max"&&(t===null||s.value<t)&&(t=s.value);return t}}Us.create=e=>new Us({checks:[],typeName:G.ZodBigInt,coerce:e?.coerce??!1,...ee(e)});class bo extends ne{_parse(t){if(this._def.coerce&&(t.data=!!t.data),this._getType(t)!==V.boolean){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.boolean,received:n.parsedType}),q}return Be(t.data)}}bo.create=e=>new bo({typeName:G.ZodBoolean,coerce:e?.coerce||!1,...ee(e)});class Cn extends ne{_parse(t){if(this._def.coerce&&(t.data=new Date(t.data)),this._getType(t)!==V.date){const i=this._getOrReturnCtx(t);return N(i,{code:I.invalid_type,expected:V.date,received:i.parsedType}),q}if(Number.isNaN(t.data.getTime())){const i=this._getOrReturnCtx(t);return N(i,{code:I.invalid_date}),q}const n=new Ae;let r;for(const i of this._def.checks)i.kind==="min"?t.data.getTime()<i.value&&(r=this._getOrReturnCtx(t,r),N(r,{code:I.too_small,message:i.message,inclusive:!0,exact:!1,minimum:i.value,type:"date"}),n.dirty()):i.kind==="max"?t.data.getTime()>i.value&&(r=this._getOrReturnCtx(t,r),N(r,{code:I.too_big,message:i.message,inclusive:!0,exact:!1,maximum:i.value,type:"date"}),n.dirty()):re.assertNever(i);return{status:n.value,value:new Date(t.data.getTime())}}_addCheck(t){return new Cn({...this._def,checks:[...this._def.checks,t]})}min(t,s){return this._addCheck({kind:"min",value:t.getTime(),message:U.toString(s)})}max(t,s){return this._addCheck({kind:"max",value:t.getTime(),message:U.toString(s)})}get minDate(){let t=null;for(const s of this._def.checks)s.kind==="min"&&(t===null||s.value>t)&&(t=s.value);return t!=null?new Date(t):null}get maxDate(){let t=null;for(const s of this._def.checks)s.kind==="max"&&(t===null||s.value<t)&&(t=s.value);return t!=null?new Date(t):null}}Cn.create=e=>new Cn({checks:[],coerce:e?.coerce||!1,typeName:G.ZodDate,...ee(e)});class xo extends ne{_parse(t){if(this._getType(t)!==V.symbol){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.symbol,received:n.parsedType}),q}return Be(t.data)}}xo.create=e=>new xo({typeName:G.ZodSymbol,...ee(e)});class wo extends ne{_parse(t){if(this._getType(t)!==V.undefined){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.undefined,received:n.parsedType}),q}return Be(t.data)}}wo.create=e=>new wo({typeName:G.ZodUndefined,...ee(e)});class So extends ne{_parse(t){if(this._getType(t)!==V.null){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.null,received:n.parsedType}),q}return Be(t.data)}}So.create=e=>new So({typeName:G.ZodNull,...ee(e)});class Ro extends ne{constructor(){super(...arguments),this._any=!0}_parse(t){return Be(t.data)}}Ro.create=e=>new Ro({typeName:G.ZodAny,...ee(e)});class Co extends ne{constructor(){super(...arguments),this._unknown=!0}_parse(t){return Be(t.data)}}Co.create=e=>new Co({typeName:G.ZodUnknown,...ee(e)});class Lt extends ne{_parse(t){const s=this._getOrReturnCtx(t);return N(s,{code:I.invalid_type,expected:V.never,received:s.parsedType}),q}}Lt.create=e=>new Lt({typeName:G.ZodNever,...ee(e)});class Po extends ne{_parse(t){if(this._getType(t)!==V.undefined){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.void,received:n.parsedType}),q}return Be(t.data)}}Po.create=e=>new Po({typeName:G.ZodVoid,...ee(e)});class et extends ne{_parse(t){const{ctx:s,status:n}=this._processInputParams(t),r=this._def;if(s.parsedType!==V.array)return N(s,{code:I.invalid_type,expected:V.array,received:s.parsedType}),q;if(r.exactLength!==null){const o=s.data.length>r.exactLength.value,a=s.data.length<r.exactLength.value;(o||a)&&(N(s,{code:o?I.too_big:I.too_small,minimum:a?r.exactLength.value:void 0,maximum:o?r.exactLength.value:void 0,type:"array",inclusive:!0,exact:!0,message:r.exactLength.message}),n.dirty())}if(r.minLength!==null&&s.data.length<r.minLength.value&&(N(s,{code:I.too_small,minimum:r.minLength.value,type:"array",inclusive:!0,exact:!1,message:r.minLength.message}),n.dirty()),r.maxLength!==null&&s.data.length>r.maxLength.value&&(N(s,{code:I.too_big,maximum:r.maxLength.value,type:"array",inclusive:!0,exact:!1,message:r.maxLength.message}),n.dirty()),s.common.async)return Promise.all([...s.data].map((o,a)=>r.type._parseAsync(new It(s,o,s.path,a)))).then(o=>Ae.mergeArray(n,o));const i=[...s.data].map((o,a)=>r.type._parseSync(new It(s,o,s.path,a)));return Ae.mergeArray(n,i)}get element(){return this._def.type}min(t,s){return new et({...this._def,minLength:{value:t,message:U.toString(s)}})}max(t,s){return new et({...this._def,maxLength:{value:t,message:U.toString(s)}})}length(t,s){return new et({...this._def,exactLength:{value:t,message:U.toString(s)}})}nonempty(t){return this.min(1,t)}}et.create=(e,t)=>new et({type:e,minLength:null,maxLength:null,exactLength:null,typeName:G.ZodArray,...ee(t)});function qt(e){if(e instanceof ye){const t={};for(const s in e.shape){const n=e.shape[s];t[s]=Ct.create(qt(n))}return new ye({...e._def,shape:()=>t})}else return e instanceof et?new et({...e._def,type:qt(e.element)}):e instanceof Ct?Ct.create(qt(e.unwrap())):e instanceof os?os.create(qt(e.unwrap())):e instanceof Ht?Ht.create(e.items.map(t=>qt(t))):e}class ye extends ne{constructor(){super(...arguments),this._cached=null,this.nonstrict=this.passthrough,this.augment=this.extend}_getCached(){if(this._cached!==null)return this._cached;const t=this._def.shape(),s=re.objectKeys(t);return this._cached={shape:t,keys:s},this._cached}_parse(t){if(this._getType(t)!==V.object){const u=this._getOrReturnCtx(t);return N(u,{code:I.invalid_type,expected:V.object,received:u.parsedType}),q}const{status:n,ctx:r}=this._processInputParams(t),{shape:i,keys:o}=this._getCached(),a=[];if(!(this._def.catchall instanceof Lt&&this._def.unknownKeys==="strip"))for(const u in r.data)o.includes(u)||a.push(u);const c=[];for(const u of o){const f=i[u],l=r.data[u];c.push({key:{status:"valid",value:u},value:f._parse(new It(r,l,r.path,u)),alwaysSet:u in r.data})}if(this._def.catchall instanceof Lt){const u=this._def.unknownKeys;if(u==="passthrough")for(const f of a)c.push({key:{status:"valid",value:f},value:{status:"valid",value:r.data[f]}});else if(u==="strict")a.length>0&&(N(r,{code:I.unrecognized_keys,keys:a}),n.dirty());else if(u!=="strip")throw new Error("Internal ZodObject error: invalid unknownKeys value.")}else{const u=this._def.catchall;for(const f of a){const l=r.data[f];c.push({key:{status:"valid",value:f},value:u._parse(new It(r,l,r.path,f)),alwaysSet:f in r.data})}}return r.common.async?Promise.resolve().then(async()=>{const u=[];for(const f of c){const l=await f.key,d=await f.value;u.push({key:l,value:d,alwaysSet:f.alwaysSet})}return u}).then(u=>Ae.mergeObjectSync(n,u)):Ae.mergeObjectSync(n,c)}get shape(){return this._def.shape()}strict(t){return U.errToObj,new ye({...this._def,unknownKeys:"strict",...t!==void 0?{errorMap:(s,n)=>{const r=this._def.errorMap?.(s,n).message??n.defaultError;return s.code==="unrecognized_keys"?{message:U.errToObj(t).message??r}:{message:r}}}:{}})}strip(){return new ye({...this._def,unknownKeys:"strip"})}passthrough(){return new ye({...this._def,unknownKeys:"passthrough"})}extend(t){return new ye({...this._def,shape:()=>({...this._def.shape(),...t})})}merge(t){return new ye({unknownKeys:t._def.unknownKeys,catchall:t._def.catchall,shape:()=>({...this._def.shape(),...t._def.shape()}),typeName:G.ZodObject})}setKey(t,s){return this.augment({[t]:s})}catchall(t){return new ye({...this._def,catchall:t})}pick(t){const s={};for(const n of re.objectKeys(t))t[n]&&this.shape[n]&&(s[n]=this.shape[n]);return new ye({...this._def,shape:()=>s})}omit(t){const s={};for(const n of re.objectKeys(this.shape))t[n]||(s[n]=this.shape[n]);return new ye({...this._def,shape:()=>s})}deepPartial(){return qt(this)}partial(t){const s={};for(const n of re.objectKeys(this.shape)){const r=this.shape[n];t&&!t[n]?s[n]=r:s[n]=r.optional()}return new ye({...this._def,shape:()=>s})}required(t){const s={};for(const n of re.objectKeys(this.shape))if(t&&!t[n])s[n]=this.shape[n];else{let i=this.shape[n];for(;i instanceof Ct;)i=i._def.innerType;s[n]=i}return new ye({...this._def,shape:()=>s})}keyof(){return Ya(re.objectKeys(this.shape))}}ye.create=(e,t)=>new ye({shape:()=>e,unknownKeys:"strip",catchall:Lt.create(),typeName:G.ZodObject,...ee(t)});ye.strictCreate=(e,t)=>new ye({shape:()=>e,unknownKeys:"strict",catchall:Lt.create(),typeName:G.ZodObject,...ee(t)});ye.lazycreate=(e,t)=>new ye({shape:e,unknownKeys:"strip",catchall:Lt.create(),typeName:G.ZodObject,...ee(t)});class Pn extends ne{_parse(t){const{ctx:s}=this._processInputParams(t),n=this._def.options;function r(i){for(const a of i)if(a.result.status==="valid")return a.result;for(const a of i)if(a.result.status==="dirty")return s.common.issues.push(...a.ctx.common.issues),a.result;const o=i.map(a=>new ft(a.ctx.common.issues));return N(s,{code:I.invalid_union,unionErrors:o}),q}if(s.common.async)return Promise.all(n.map(async i=>{const o={...s,common:{...s.common,issues:[]},parent:null};return{result:await i._parseAsync({data:s.data,path:s.path,parent:o}),ctx:o}})).then(r);{let i;const o=[];for(const c of n){const u={...s,common:{...s.common,issues:[]},parent:null},f=c._parseSync({data:s.data,path:s.path,parent:u});if(f.status==="valid")return f;f.status==="dirty"&&!i&&(i={result:f,ctx:u}),u.common.issues.length&&o.push(u.common.issues)}if(i)return s.common.issues.push(...i.ctx.common.issues),i.result;const a=o.map(c=>new ft(c));return N(s,{code:I.invalid_union,unionErrors:a}),q}}get options(){return this._def.options}}Pn.create=(e,t)=>new Pn({options:e,typeName:G.ZodUnion,...ee(t)});function Ir(e,t){const s=gt(e),n=gt(t);if(e===t)return{valid:!0,data:e};if(s===V.object&&n===V.object){const r=re.objectKeys(t),i=re.objectKeys(e).filter(a=>r.indexOf(a)!==-1),o={...e,...t};for(const a of i){const c=Ir(e[a],t[a]);if(!c.valid)return{valid:!1};o[a]=c.data}return{valid:!0,data:o}}else if(s===V.array&&n===V.array){if(e.length!==t.length)return{valid:!1};const r=[];for(let i=0;i<e.length;i++){const o=e[i],a=t[i],c=Ir(o,a);if(!c.valid)return{valid:!1};r.push(c.data)}return{valid:!0,data:r}}else return s===V.date&&n===V.date&&+e==+t?{valid:!0,data:e}:{valid:!1}}class kn extends ne{_parse(t){const{status:s,ctx:n}=this._processInputParams(t),r=(i,o)=>{if(vo(i)||vo(o))return q;const a=Ir(i.value,o.value);return a.valid?((yo(i)||yo(o))&&s.dirty(),{status:s.value,value:a.data}):(N(n,{code:I.invalid_intersection_types}),q)};return n.common.async?Promise.all([this._def.left._parseAsync({data:n.data,path:n.path,parent:n}),this._def.right._parseAsync({data:n.data,path:n.path,parent:n})]).then(([i,o])=>r(i,o)):r(this._def.left._parseSync({data:n.data,path:n.path,parent:n}),this._def.right._parseSync({data:n.data,path:n.path,parent:n}))}}kn.create=(e,t,s)=>new kn({left:e,right:t,typeName:G.ZodIntersection,...ee(s)});class Ht extends ne{_parse(t){const{status:s,ctx:n}=this._processInputParams(t);if(n.parsedType!==V.array)return N(n,{code:I.invalid_type,expected:V.array,received:n.parsedType}),q;if(n.data.length<this._def.items.length)return N(n,{code:I.too_small,minimum:this._def.items.length,inclusive:!0,exact:!1,type:"array"}),q;!this._def.rest&&n.data.length>this._def.items.length&&(N(n,{code:I.too_big,maximum:this._def.items.length,inclusive:!0,exact:!1,type:"array"}),s.dirty());const i=[...n.data].map((o,a)=>{const c=this._def.items[a]||this._def.rest;return c?c._parse(new It(n,o,n.path,a)):null}).filter(o=>!!o);return n.common.async?Promise.all(i).then(o=>Ae.mergeArray(s,o)):Ae.mergeArray(s,i)}get items(){return this._def.items}rest(t){return new Ht({...this._def,rest:t})}}Ht.create=(e,t)=>{if(!Array.isArray(e))throw new Error("You must pass an array of schemas to z.tuple([ ... ])");return new Ht({items:e,typeName:G.ZodTuple,rest:null,...ee(t)})};class ko extends ne{get keySchema(){return this._def.keyType}get valueSchema(){return this._def.valueType}_parse(t){const{status:s,ctx:n}=this._processInputParams(t);if(n.parsedType!==V.map)return N(n,{code:I.invalid_type,expected:V.map,received:n.parsedType}),q;const r=this._def.keyType,i=this._def.valueType,o=[...n.data.entries()].map(([a,c],u)=>({key:r._parse(new It(n,a,n.path,[u,"key"])),value:i._parse(new It(n,c,n.path,[u,"value"]))}));if(n.common.async){const a=new Map;return Promise.resolve().then(async()=>{for(const c of o){const u=await c.key,f=await c.value;if(u.status==="aborted"||f.status==="aborted")return q;(u.status==="dirty"||f.status==="dirty")&&s.dirty(),a.set(u.value,f.value)}return{status:s.value,value:a}})}else{const a=new Map;for(const c of o){const u=c.key,f=c.value;if(u.status==="aborted"||f.status==="aborted")return q;(u.status==="dirty"||f.status==="dirty")&&s.dirty(),a.set(u.value,f.value)}return{status:s.value,value:a}}}}ko.create=(e,t,s)=>new ko({valueType:t,keyType:e,typeName:G.ZodMap,...ee(s)});class Hs extends ne{_parse(t){const{status:s,ctx:n}=this._processInputParams(t);if(n.parsedType!==V.set)return N(n,{code:I.invalid_type,expected:V.set,received:n.parsedType}),q;const r=this._def;r.minSize!==null&&n.data.size<r.minSize.value&&(N(n,{code:I.too_small,minimum:r.minSize.value,type:"set",inclusive:!0,exact:!1,message:r.minSize.message}),s.dirty()),r.maxSize!==null&&n.data.size>r.maxSize.value&&(N(n,{code:I.too_big,maximum:r.maxSize.value,type:"set",inclusive:!0,exact:!1,message:r.maxSize.message}),s.dirty());const i=this._def.valueType;function o(c){const u=new Set;for(const f of c){if(f.status==="aborted")return q;f.status==="dirty"&&s.dirty(),u.add(f.value)}return{status:s.value,value:u}}const a=[...n.data.values()].map((c,u)=>i._parse(new It(n,c,n.path,u)));return n.common.async?Promise.all(a).then(c=>o(c)):o(a)}min(t,s){return new Hs({...this._def,minSize:{value:t,message:U.toString(s)}})}max(t,s){return new Hs({...this._def,maxSize:{value:t,message:U.toString(s)}})}size(t,s){return this.min(t,s).max(t,s)}nonempty(t){return this.min(1,t)}}Hs.create=(e,t)=>new Hs({valueType:e,minSize:null,maxSize:null,typeName:G.ZodSet,...ee(t)});class To extends ne{get schema(){return this._def.getter()}_parse(t){const{ctx:s}=this._processInputParams(t);return this._def.getter()._parse({data:s.data,path:s.path,parent:s})}}To.create=(e,t)=>new To({getter:e,typeName:G.ZodLazy,...ee(t)});class Io extends ne{_parse(t){if(t.data!==this._def.value){const s=this._getOrReturnCtx(t);return N(s,{received:s.data,code:I.invalid_literal,expected:this._def.value}),q}return{status:"valid",value:t.data}}get value(){return this._def.value}}Io.create=(e,t)=>new Io({value:e,typeName:G.ZodLiteral,...ee(t)});function Ya(e,t){return new rs({values:e,typeName:G.ZodEnum,...ee(t)})}class rs extends ne{_parse(t){if(typeof t.data!="string"){const s=this._getOrReturnCtx(t),n=this._def.values;return N(s,{expected:re.joinValues(n),received:s.parsedType,code:I.invalid_type}),q}if(this._cache||(this._cache=new Set(this._def.values)),!this._cache.has(t.data)){const s=this._getOrReturnCtx(t),n=this._def.values;return N(s,{received:s.data,code:I.invalid_enum_value,options:n}),q}return Be(t.data)}get options(){return this._def.values}get enum(){const t={};for(const s of this._def.values)t[s]=s;return t}get Values(){const t={};for(const s of this._def.values)t[s]=s;return t}get Enum(){const t={};for(const s of this._def.values)t[s]=s;return t}extract(t,s=this._def){return rs.create(t,{...this._def,...s})}exclude(t,s=this._def){return rs.create(this.options.filter(n=>!t.includes(n)),{...this._def,...s})}}rs.create=Ya;class Lo extends ne{_parse(t){const s=re.getValidEnumValues(this._def.values),n=this._getOrReturnCtx(t);if(n.parsedType!==V.string&&n.parsedType!==V.number){const r=re.objectValues(s);return N(n,{expected:re.joinValues(r),received:n.parsedType,code:I.invalid_type}),q}if(this._cache||(this._cache=new Set(re.getValidEnumValues(this._def.values))),!this._cache.has(t.data)){const r=re.objectValues(s);return N(n,{received:n.data,code:I.invalid_enum_value,options:r}),q}return Be(t.data)}get enum(){return this._def.values}}Lo.create=(e,t)=>new Lo({values:e,typeName:G.ZodNativeEnum,...ee(t)});class Tn extends ne{unwrap(){return this._def.type}_parse(t){const{ctx:s}=this._processInputParams(t);if(s.parsedType!==V.promise&&s.common.async===!1)return N(s,{code:I.invalid_type,expected:V.promise,received:s.parsedType}),q;const n=s.parsedType===V.promise?s.data:Promise.resolve(s.data);return Be(n.then(r=>this._def.type.parseAsync(r,{path:s.path,errorMap:s.common.contextualErrorMap})))}}Tn.create=(e,t)=>new Tn({type:e,typeName:G.ZodPromise,...ee(t)});class is extends ne{innerType(){return this._def.schema}sourceType(){return this._def.schema._def.typeName===G.ZodEffects?this._def.schema.sourceType():this._def.schema}_parse(t){const{status:s,ctx:n}=this._processInputParams(t),r=this._def.effect||null,i={addIssue:o=>{N(n,o),o.fatal?s.abort():s.dirty()},get path(){return n.path}};if(i.addIssue=i.addIssue.bind(i),r.type==="preprocess"){const o=r.transform(n.data,i);if(n.common.async)return Promise.resolve(o).then(async a=>{if(s.value==="aborted")return q;const c=await this._def.schema._parseAsync({data:a,path:n.path,parent:n});return c.status==="aborted"?q:c.status==="dirty"||s.value==="dirty"?ys(c.value):c});{if(s.value==="aborted")return q;const a=this._def.schema._parseSync({data:o,path:n.path,parent:n});return a.status==="aborted"?q:a.status==="dirty"||s.value==="dirty"?ys(a.value):a}}if(r.type==="refinement"){const o=a=>{const c=r.refinement(a,i);if(n.common.async)return Promise.resolve(c);if(c instanceof Promise)throw new Error("Async refinement encountered during synchronous parse operation. Use .parseAsync instead.");return a};if(n.common.async===!1){const a=this._def.schema._parseSync({data:n.data,path:n.path,parent:n});return a.status==="aborted"?q:(a.status==="dirty"&&s.dirty(),o(a.value),{status:s.value,value:a.value})}else return this._def.schema._parseAsync({data:n.data,path:n.path,parent:n}).then(a=>a.status==="aborted"?q:(a.status==="dirty"&&s.dirty(),o(a.value).then(()=>({status:s.value,value:a.value}))))}if(r.type==="transform")if(n.common.async===!1){const o=this._def.schema._parseSync({data:n.data,path:n.path,parent:n});if(!ns(o))return q;const a=r.transform(o.value,i);if(a instanceof Promise)throw new Error("Asynchronous transform encountered during synchronous parse operation. Use .parseAsync instead.");return{status:s.value,value:a}}else return this._def.schema._parseAsync({data:n.data,path:n.path,parent:n}).then(o=>ns(o)?Promise.resolve(r.transform(o.value,i)).then(a=>({status:s.value,value:a})):q);re.assertNever(r)}}is.create=(e,t,s)=>new is({schema:e,typeName:G.ZodEffects,effect:t,...ee(s)});is.createWithPreprocess=(e,t,s)=>new is({schema:t,effect:{type:"preprocess",transform:e},typeName:G.ZodEffects,...ee(s)});class Ct extends ne{_parse(t){return this._getType(t)===V.undefined?Be(void 0):this._def.innerType._parse(t)}unwrap(){return this._def.innerType}}Ct.create=(e,t)=>new Ct({innerType:e,typeName:G.ZodOptional,...ee(t)});class os extends ne{_parse(t){return this._getType(t)===V.null?Be(null):this._def.innerType._parse(t)}unwrap(){return this._def.innerType}}os.create=(e,t)=>new os({innerType:e,typeName:G.ZodNullable,...ee(t)});class Lr extends ne{_parse(t){const{ctx:s}=this._processInputParams(t);let n=s.data;return s.parsedType===V.undefined&&(n=this._def.defaultValue()),this._def.innerType._parse({data:n,path:s.path,parent:s})}removeDefault(){return this._def.innerType}}Lr.create=(e,t)=>new Lr({innerType:e,typeName:G.ZodDefault,defaultValue:typeof t.default=="function"?t.default:()=>t.default,...ee(t)});class Mr extends ne{_parse(t){const{ctx:s}=this._processInputParams(t),n={...s,common:{...s.common,issues:[]}},r=this._def.innerType._parse({data:n.data,path:n.path,parent:{...n}});return Rn(r)?r.then(i=>({status:"valid",value:i.status==="valid"?i.value:this._def.catchValue({get error(){return new ft(n.common.issues)},input:n.data})})):{status:"valid",value:r.status==="valid"?r.value:this._def.catchValue({get error(){return new ft(n.common.issues)},input:n.data})}}removeCatch(){return this._def.innerType}}Mr.create=(e,t)=>new Mr({innerType:e,typeName:G.ZodCatch,catchValue:typeof t.catch=="function"?t.catch:()=>t.catch,...ee(t)});class Mo extends ne{_parse(t){if(this._getType(t)!==V.nan){const n=this._getOrReturnCtx(t);return N(n,{code:I.invalid_type,expected:V.nan,received:n.parsedType}),q}return{status:"valid",value:t.data}}}Mo.create=e=>new Mo({typeName:G.ZodNaN,...ee(e)});class Zd extends ne{_parse(t){const{ctx:s}=this._processInputParams(t),n=s.data;return this._def.type._parse({data:n,path:s.path,parent:s})}unwrap(){return this._def.type}}class yi extends ne{_parse(t){const{status:s,ctx:n}=this._processInputParams(t);if(n.common.async)return(async()=>{const i=await this._def.in._parseAsync({data:n.data,path:n.path,parent:n});return i.status==="aborted"?q:i.status==="dirty"?(s.dirty(),ys(i.value)):this._def.out._parseAsync({data:i.value,path:n.path,parent:n})})();{const r=this._def.in._parseSync({data:n.data,path:n.path,parent:n});return r.status==="aborted"?q:r.status==="dirty"?(s.dirty(),{status:"dirty",value:r.value}):this._def.out._parseSync({data:r.value,path:n.path,parent:n})}}static create(t,s){return new yi({in:t,out:s,typeName:G.ZodPipeline})}}class Er extends ne{_parse(t){const s=this._def.innerType._parse(t),n=r=>(ns(r)&&(r.value=Object.freeze(r.value)),r);return Rn(s)?s.then(r=>n(r)):n(s)}unwrap(){return this._def.innerType}}Er.create=(e,t)=>new Er({innerType:e,typeName:G.ZodReadonly,...ee(t)});var G;(function(e){e.ZodString="ZodString",e.ZodNumber="ZodNumber",e.ZodNaN="ZodNaN",e.ZodBigInt="ZodBigInt",e.ZodBoolean="ZodBoolean",e.ZodDate="ZodDate",e.ZodSymbol="ZodSymbol",e.ZodUndefined="ZodUndefined",e.ZodNull="ZodNull",e.ZodAny="ZodAny",e.ZodUnknown="ZodUnknown",e.ZodNever="ZodNever",e.ZodVoid="ZodVoid",e.ZodArray="ZodArray",e.ZodObject="ZodObject",e.ZodUnion="ZodUnion",e.ZodDiscriminatedUnion="ZodDiscriminatedUnion",e.ZodIntersection="ZodIntersection",e.ZodTuple="ZodTuple",e.ZodRecord="ZodRecord",e.ZodMap="ZodMap",e.ZodSet="ZodSet",e.ZodFunction="ZodFunction",e.ZodLazy="ZodLazy",e.ZodLiteral="ZodLiteral",e.ZodEnum="ZodEnum",e.ZodEffects="ZodEffects",e.ZodNativeEnum="ZodNativeEnum",e.ZodOptional="ZodOptional",e.ZodNullable="ZodNullable",e.ZodDefault="ZodDefault",e.ZodCatch="ZodCatch",e.ZodPromise="ZodPromise",e.ZodBranded="ZodBranded",e.ZodPipeline="ZodPipeline",e.ZodReadonly="ZodReadonly"})(G||(G={}));const Wd=bt.create;Lt.create;et.create;const zd=ye.create;Pn.create;kn.create;Ht.create;rs.create;Tn.create;Ct.create;os.create;const Kd=e=>{const t="input"in e?e.input:"input",s="output"in e?e.output:"output",n="schema"in e?e.schema._input:e._input,r="schema"in e?e.schema._output:e._output;return{types:{input:t==="output"?r:n,output:s==="input"?n:r},parse:i=>"schema"in e?e.schema.parse(i):e.parse(i)}},qd=()=>ls(()=>import("./page-with-search-BhJv4yJI.js"),__vite__mapDeps([0,1])),Gd=cs("/(tests)/page-with-search")({validateSearch:Kd(zd({where:Wd()})),component:vi(qd,"component")}),Jd=()=>ls(()=>import("./normal-page-BPOVyYTF.js"),__vite__mapDeps([2,1])),Yd=cs("/(tests)/normal-page")({component:vi(Jd,"component")});(function e(t){function s(r,i,o){var a,c={};if(Array.isArray(r))return r.concat(i);for(a in r)c[o?a.toLowerCase():a]=r[a];for(a in i){var u=o?a.toLowerCase():a,f=i[a];c[u]=u in c&&typeof f=="object"?s(c[u],f,u=="headers"):f}return c}function n(r,i,o,a,c){var u=typeof r!="string"?(i=r).url:r,f={config:i},l=s(t,i),d={};a=a||l.data,(l.transformRequest||[]).map(function(h){a=h(a,l.headers)||a}),l.auth&&(d.authorization=l.auth),a&&typeof a=="object"&&typeof a.append!="function"&&typeof a.text!="function"&&(a=JSON.stringify(a),d["content-type"]="application/json");try{d[l.xsrfHeaderName]=decodeURIComponent(document.cookie.match(RegExp("(^|; )"+l.xsrfCookieName+"=([^;]*)"))[2])}catch{}return l.baseURL&&(u=u.replace(/^(?!.*\/\/)\/?/,l.baseURL+"/")),l.params&&(u+=(~u.indexOf("?")?"&":"?")+(l.paramsSerializer?l.paramsSerializer(l.params):new URLSearchParams(l.params))),(l.fetch||fetch)(u,{method:(o||l.method||"get").toUpperCase(),body:a,headers:s(l.headers,d,!0),credentials:l.withCredentials?"include":c}).then(function(h){for(var g in h)typeof h[g]!="function"&&(f[g]=h[g]);return l.responseType=="stream"?(f.data=h.body,f):h[l.responseType||"text"]().then(function(y){f.data=y,f.data=JSON.parse(y)}).catch(Object).then(function(){return(l.validateStatus?l.validateStatus(h.status):h.ok)?f:Promise.reject(f)})})}return t=t||{},n.request=n,n.get=function(r,i){return n(r,i,"get")},n.delete=function(r,i){return n(r,i,"delete")},n.head=function(r,i){return n(r,i,"head")},n.options=function(r,i){return n(r,i,"options")},n.post=function(r,i,o){return n(r,o,"post",i)},n.put=function(r,i,o){return n(r,o,"put",i)},n.patch=function(r,i,o){return n(r,o,"patch",i)},n.all=Promise.all.bind(Promise),n.spread=function(r){return r.apply.bind(r,r)},n.CancelToken=typeof AbortController=="function"?AbortController:Object,n.defaults=t,n.create=e,n})();function Xd(e){return new Promise(t=>setTimeout(t,e))}const Qd=cs("/(tests)/lazy-with-loader-page")({loader:async()=>(await Xd(1e3),{foo:"bar"})}),eh=cs("/(tests)/lazy-page")({}),th=cs("/(tests)/virtual-page")(),sh=yd.update({id:"/",path:"/",getParentRoute:()=>Wt}),nh=th.update({id:"/(tests)/virtual-page",path:"/virtual-page",getParentRoute:()=>Wt}).lazy(()=>ls(()=>import("./virtual-page.lazy-BCqvdivF.js"),__vite__mapDeps([3,1])).then(e=>e.Route)),rh=Gd.update({id:"/(tests)/page-with-search",path:"/page-with-search",getParentRoute:()=>Wt}),ih=Yd.update({id:"/(tests)/normal-page",path:"/normal-page",getParentRoute:()=>Wt}),oh=Qd.update({id:"/(tests)/lazy-with-loader-page",path:"/lazy-with-loader-page",getParentRoute:()=>Wt}).lazy(()=>ls(()=>import("./lazy-with-loader-page.lazy-BzLmn584.js"),__vite__mapDeps([4,1])).then(e=>e.Route)),ah=eh.update({id:"/(tests)/lazy-page",path:"/lazy-page",getParentRoute:()=>Wt}).lazy(()=>ls(()=>import("./lazy-page.lazy-BzoMuhUY.js"),__vite__mapDeps([5,1])).then(e=>e.Route)),ch={IndexRoute:sh,testsLazyPageRoute:ah,testsLazyWithLoaderPageRoute:oh,testsNormalPageRoute:ih,testsPageWithSearchRoute:rh,testsVirtualPageLazyRoute:nh},lh=Wt._addFileChildren(ch)._addFileTypes();let Xa;Xa=Fu();const uh=sd({routeTree:lh,history:Xa,scrollRestoration:!0}),fh=document.getElementById("app");fh?.innerHTML||ku({setup(){return()=>ce(id,{router:uh},null)}}).mount("#app");export{Fe as F,ho as L,ce as a,xr as b,mh as c,ms as l,ri as m};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-ElfLiipA.css b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-ElfLiipA.css
deleted file mode 100644
index b6e247a9c9..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-ElfLiipA.css
+++ /dev/null
@@ -1 +0,0 @@
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base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif,system-ui,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier 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components;@layer utilities{.flex{display:flex}.grid{display:grid}.gap-2{gap:calc(var(--spacing)*2)}.border{border-style:var(--tw-border-style);border-width:1px}.p-2{padding:calc(var(--spacing)*2)}.text-lg{font-size:var(--text-lg);line-height:var(--tw-leading,var(--text-lg--line-height))}.font-bold{--tw-font-weight:var(--font-weight-bold);font-weight:var(--font-weight-bold)}}html{color-scheme:light dark}*{border-color:var(--color-gray-200)}@media (prefers-color-scheme:dark){*{border-color:var(--color-gray-800)}}body{background-color:var(--color-gray-50);color:var(--color-gray-950)}@media (prefers-color-scheme:dark){body{background-color:var(--color-gray-900);color:var(--color-gray-200)}}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-rPfEOKs3.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-rPfEOKs3.js
deleted file mode 100644
index 7dff2a5190..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/index-rPfEOKs3.js
+++ /dev/null
@@ -1 +0,0 @@
-import{a as e,l as t,b as a,L as r,m as s}from"./index-BwsVWHwV.js";function i(){return e("div",{class:"p-2 grid gap-2"},[e("h3",null,[a("Welcome Home!")]),e("p",null,[a("The are the links to be tested when navigating away from the index page. Otherwise known as NOT first-load tests, rather known as navigation tests.")]),[t({to:"/normal-page"}),t({to:"/lazy-page"}),t({to:"/virtual-page"}),t({to:"/lazy-with-loader-page"}),t({to:"/page-with-search",search:{where:"footer"}})].map((o,n)=>e("div",{class:"border p-2"},[e("h4",null,[o.to,a(" tests")]),e("p",null,[e(r,s(o,{hash:"at-the-bottom"}),{default:()=>[o.to,a("#at-the-bottom")]})])]))])}export{i as component};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-page.lazy-BzoMuhUY.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-page.lazy-BzoMuhUY.js
deleted file mode 100644
index b2ab5a4389..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-page.lazy-BzoMuhUY.js
+++ /dev/null
@@ -1 +0,0 @@
-import{c as l,a as e,b as o}from"./index-BwsVWHwV.js";import{S as t}from"./scroll-block-BAas_Ct-.js";const c=l("/(tests)/lazy-page")({component:a});function a(){return e("div",{class:"p-2"},[e("h3",null,[o("lazy-page")]),e("hr",null,null),e(t,null,null)])}export{c as Route};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-with-loader-page.lazy-BzLmn584.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-with-loader-page.lazy-BzLmn584.js
deleted file mode 100644
index ab267814ce..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/lazy-with-loader-page.lazy-BzLmn584.js
+++ /dev/null
@@ -1 +0,0 @@
-import{c as l,a as e,b as o}from"./index-BwsVWHwV.js";import{S as t}from"./scroll-block-BAas_Ct-.js";const c=l("/(tests)/lazy-with-loader-page")({component:a});function a(){return e("div",{class:"p-2"},[e("h3",null,[o("lazy-with-loader-page")]),e("hr",null,null),e(t,null,null)])}export{c as Route};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/normal-page-BPOVyYTF.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/normal-page-BPOVyYTF.js
deleted file mode 100644
index ec26f71d98..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/normal-page-BPOVyYTF.js
+++ /dev/null
@@ -1 +0,0 @@
-import{S as o}from"./scroll-block-BAas_Ct-.js";import{a as l,b as n}from"./index-BwsVWHwV.js";function a(){return l("div",{class:"p-2"},[l("h3",null,[n("normal-page")]),l("hr",null,null),l(o,null,null)])}export{a as component};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/page-with-search-BhJv4yJI.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/page-with-search-BhJv4yJI.js
deleted file mode 100644
index 67ce6cd937..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/page-with-search-BhJv4yJI.js
+++ /dev/null
@@ -1 +0,0 @@
-import{S as o}from"./scroll-block-BAas_Ct-.js";import{a as l,b as e}from"./index-BwsVWHwV.js";function t(){return l("div",{class:"p-2"},[l("h3",null,[e("page-with-search")]),l("hr",null,null),l(o,null,null)])}export{t as component};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/scroll-block-BAas_Ct-.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/scroll-block-BAas_Ct-.js
deleted file mode 100644
index 89ed1c6988..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/scroll-block-BAas_Ct-.js
+++ /dev/null
@@ -1 +0,0 @@
-import{a as t,b as r,F as l}from"./index-BwsVWHwV.js";const o="at-the-top",a="at-the-bottom";function m({number:e=100}){return t(l,null,[t("div",{id:o,"data-testid":o},null),Array.from({length:e}).map((n,d)=>t("div",null,[d])),t("div",{id:a,"data-testid":a},[r("At the bottom")])])}export{m as S};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/virtual-page.lazy-BCqvdivF.js b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/virtual-page.lazy-BCqvdivF.js
deleted file mode 100644
index 82d2cac67f..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/assets/virtual-page.lazy-BCqvdivF.js
+++ /dev/null
@@ -1 +0,0 @@
-import{c as t,a as e,b as l}from"./index-BwsVWHwV.js";import{S as o}from"./scroll-block-BAas_Ct-.js";const u=t("/(tests)/virtual-page")({component:a});function a(){return e("div",{class:"p-2"},[e("h3",null,[l("virtual-page")]),e("hr",null,null),e(o,null,null)])}export{u as Route};
diff --git a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/index.html b/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/index.html
deleted file mode 100644
index 2a9c6c3574..0000000000
--- a/e2e/vue-router/scroll-restoration-sandbox-vite/dist-hash/index.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <script type="module" crossorigin src="/assets/index-BwsVWHwV.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-ElfLiipA.css">
-  </head>
-  <body>
-    <div id="app"></div>
-  </body>
-</html>
diff --git a/packages/react-router/src/ssr/renderRouterToStream.tsx b/packages/react-router/src/ssr/renderRouterToStream.tsx
index 52327d3050..d42a22396a 100644
--- a/packages/react-router/src/ssr/renderRouterToStream.tsx
+++ b/packages/react-router/src/ssr/renderRouterToStream.tsx
@@ -2,6 +2,7 @@ import { PassThrough } from 'node:stream'
 import ReactDOMServer from 'react-dom/server'
 import { isbot } from 'isbot'
 import {
+  createSsrStreamResponse,
   transformPipeableStreamWithRouter,
   transformReadableStreamWithRouter,
 } from '@tanstack/router-core/ssr/server'
@@ -9,6 +10,31 @@ import type { AnyRouter } from '@tanstack/router-core'
 import type { ReadableStream } from 'node:stream/web'
 import type { ReactNode } from 'react'
 
+const noop = () => {}
+
+// Bot responses wait for `allReady` so crawlers receive complete HTML.
+// If the request disconnects during that wait, React may not settle quickly;
+// unblock the wait so the response pipeline can abort and clean up.
+async function waitForReadyOrAbort(
+  ready: Promise<unknown>,
+  signal: AbortSignal,
+) {
+  let cleanup = noop
+  try {
+    await Promise.race([
+      ready,
+      new Promise<void>((resolve) => {
+        const onAbort = () => resolve()
+        cleanup = () => signal.removeEventListener('abort', onAbort)
+        signal.addEventListener('abort', onAbort, { once: true })
+        if (signal.aborted) resolve()
+      }),
+    ])
+  } finally {
+    cleanup()
+  }
+}
+
 export const renderRouterToStream = async ({
   request,
   router,
@@ -28,60 +54,142 @@ export const renderRouterToStream = async ({
     })
 
     if (isbot(request.headers.get('User-Agent'))) {
-      await stream.allReady
+      await waitForReadyOrAbort(stream.allReady, request.signal)
     }
 
     const responseStream = transformReadableStreamWithRouter(
       router,
       stream as unknown as ReadableStream,
+      { onAbort: () => stream.cancel().catch(() => {}) },
+    )
+    return createSsrStreamResponse(
+      router,
+      new Response(responseStream as any, {
+        status: router.stores.statusCode.get(),
+        headers: responseHeaders,
+      }),
     )
-    return new Response(responseStream as any, {
-      status: router.stores.statusCode.get(),
-      headers: responseHeaders,
-    })
   }
 
   if (typeof ReactDOMServer.renderToPipeableStream === 'function') {
     const reactAppPassthrough = new PassThrough()
 
+    let pipeable:
+      | ReturnType<typeof ReactDOMServer.renderToPipeableStream>
+      | undefined
+    let responseAttached = false
+    let aborted = false
+    let endedBeforeAttach = false
+    let pendingAbortReason: unknown
+    const toError = (reason: unknown) =>
+      reason instanceof Error
+        ? reason
+        : new Error(String(reason ?? 'SSR aborted'))
+    const destroyError = (reason: unknown) =>
+      reason === undefined ? undefined : toError(reason)
+    const pendingDestroyError = () =>
+      pendingAbortReason === undefined
+        ? toError(pendingAbortReason)
+        : destroyError(pendingAbortReason)
+    const finishPassThrough = (
+      reason: unknown,
+      opts?: { defaultError?: boolean },
+    ) => {
+      if (reactAppPassthrough.destroyed) return
+      if (responseAttached) {
+        reactAppPassthrough.destroy(
+          opts?.defaultError ? toError(reason) : destroyError(reason),
+        )
+      } else {
+        endedBeforeAttach = true
+        // onError can fire synchronously before React returns the pipeable
+        // handle and before Readable.toWeb() is attached. Defer touching the
+        // PassThrough until after the router transform can observe the error.
+      }
+    }
+    const abortPipeable = (
+      reason?: unknown,
+      opts?: { defaultError?: boolean },
+    ) => {
+      if (aborted) return
+      aborted = true
+      pendingAbortReason = reason
+      const err = toError(reason)
+      try {
+        pipeable?.abort(err)
+      } catch {
+        // ignore — React may throw if already aborted/finished
+      }
+      finishPassThrough(reason, opts)
+    }
+
+    // Register before attaching the router transform; the transform may
+    // synchronously cleanup/error, and cleanup must still remove this listener.
+    if (request.signal.aborted) {
+      abortPipeable(request.signal.reason)
+    } else {
+      const onRequestAbort = () => abortPipeable(request.signal.reason)
+      request.signal.addEventListener('abort', onRequestAbort, { once: true })
+      router.serverSsr?.onCleanup(() => {
+        request.signal.removeEventListener('abort', onRequestAbort)
+      })
+    }
+
     try {
-      const pipeable = ReactDOMServer.renderToPipeableStream(children, {
+      pipeable = ReactDOMServer.renderToPipeableStream(children, {
         nonce: router.options.ssr?.nonce,
         progressiveChunkSize: Number.POSITIVE_INFINITY,
         ...(isbot(request.headers.get('User-Agent'))
           ? {
               onAllReady() {
-                pipeable.pipe(reactAppPassthrough)
+                pipeable!.pipe(reactAppPassthrough)
               },
             }
           : {
               onShellReady() {
-                pipeable.pipe(reactAppPassthrough)
+                pipeable!.pipe(reactAppPassthrough)
               },
             }),
         onError: (error, info) => {
           console.error('Error in renderToPipeableStream:', error, info)
-          // Destroy the passthrough stream on error
-          if (!reactAppPassthrough.destroyed) {
-            reactAppPassthrough.destroy(
-              error instanceof Error ? error : new Error(String(error)),
-            )
-          }
+          abortPipeable(error, { defaultError: true })
         },
       })
     } catch (e) {
       console.error('Error in renderToPipeableStream:', e)
-      reactAppPassthrough.destroy(e instanceof Error ? e : new Error(String(e)))
+      router.serverSsr?.cleanup()
+      throw e
     }
 
     const responseStream = transformPipeableStreamWithRouter(
       router,
       reactAppPassthrough,
+      { onAbort: abortPipeable },
+    )
+    responseAttached = true
+
+    if (endedBeforeAttach) {
+      reactAppPassthrough.destroy(pendingDestroyError())
+    }
+
+    // React's onError may have fired synchronously inside
+    // renderToPipeableStream before `pipeable` was assigned. If so,
+    // abortPipeable ran without a pipeable handle; re-apply the abort now.
+    if (aborted && pipeable) {
+      try {
+        pipeable.abort(toError(pendingAbortReason))
+      } catch {
+        // ignore — React may throw if already aborted/finished
+      }
+    }
+
+    return createSsrStreamResponse(
+      router,
+      new Response(responseStream as any, {
+        status: router.stores.statusCode.get(),
+        headers: responseHeaders,
+      }),
     )
-    return new Response(responseStream as any, {
-      status: router.stores.statusCode.get(),
-      headers: responseHeaders,
-    })
   }
 
   throw new Error(
diff --git a/packages/react-router/tests/renderRouterToStream.test.tsx b/packages/react-router/tests/renderRouterToStream.test.tsx
new file mode 100644
index 0000000000..74e180a552
--- /dev/null
+++ b/packages/react-router/tests/renderRouterToStream.test.tsx
@@ -0,0 +1,234 @@
+import { afterEach, describe, expect, test, vi } from 'vitest'
+import { attachRouterServerSsrUtils } from '@tanstack/router-core/ssr/server'
+import { createMemoryHistory, createRootRoute, createRouter } from '../src'
+
+const reactDomServerMocks = vi.hoisted(() => ({
+  renderToReadableStream: undefined as undefined | (() => unknown),
+  renderToPipeableStream: vi.fn(),
+}))
+
+vi.mock('react-dom/server', () => ({
+  default: reactDomServerMocks,
+  ...reactDomServerMocks,
+}))
+
+const { renderRouterToStream } = await import('../src/ssr/renderRouterToStream')
+
+afterEach(() => {
+  reactDomServerMocks.renderToReadableStream = undefined
+  reactDomServerMocks.renderToPipeableStream.mockReset()
+  vi.restoreAllMocks()
+})
+
+async function buildRouter() {
+  const rootRoute = createRootRoute({ component: () => null })
+  const router = createRouter({
+    history: createMemoryHistory({ initialEntries: ['/'] }),
+    routeTree: rootRoute,
+  })
+  router.isServer = true
+  attachRouterServerSsrUtils({ router, manifest: undefined })
+  await router.load()
+  await router.serverSsr!.dehydrate()
+  return router
+}
+
+async function expectBodyRejects(response: Response, message: string) {
+  const reader = response.body!.getReader()
+  await expect(
+    (async () => {
+      for (;;) {
+        const { done } = await reader.read()
+        if (done) return
+      }
+    })(),
+  ).rejects.toThrow(message)
+}
+
+function unwrapResponse(
+  result: Awaited<ReturnType<typeof renderRouterToStream>>,
+) {
+  return result.response
+}
+
+describe('renderRouterToStream - pipeable sync errors', () => {
+  test('sync onError before pipeable is assigned still aborts pipeable', async () => {
+    const abort = vi.fn()
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(
+      (_children, opts) => {
+        opts.onError(new Error('sync-react-error'), { componentStack: '' })
+        return { abort, pipe: vi.fn() }
+      },
+    )
+
+    const router = await buildRouter()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      )
+
+      expect(abort).toHaveBeenCalledOnce()
+      await expectBodyRejects(response, 'sync-react-error')
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('sync non-Error onError before pipeable assignment still errors body', async () => {
+    const abort = vi.fn()
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(
+      (_children, opts) => {
+        opts.onError('string-react-error', { componentStack: '' })
+        return { abort, pipe: vi.fn() }
+      },
+    )
+
+    const router = await buildRouter()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      )
+
+      expect(abort).toHaveBeenCalledOnce()
+      await expectBodyRejects(response, 'string-react-error')
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('sync undefined onError before pipeable assignment still errors body', async () => {
+    const abort = vi.fn()
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(
+      (_children, opts) => {
+        opts.onError(undefined, { componentStack: '' })
+        return { abort, pipe: vi.fn() }
+      },
+    )
+
+    const router = await buildRouter()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      )
+
+      expect(abort).toHaveBeenCalledOnce()
+      await expectBodyRejects(response, 'SSR aborted')
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('undefined onError after response attach errors body', async () => {
+    const abort = vi.fn()
+    let onError!: (error: unknown, info: unknown) => void
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(
+      (_children, opts) => {
+        onError = opts.onError
+        return { abort, pipe: vi.fn() }
+      },
+    )
+
+    const router = await buildRouter()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      )
+
+      onError(undefined, { componentStack: '' })
+      expect(abort).toHaveBeenCalledOnce()
+      await expectBodyRejects(response, 'SSR aborted')
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('setup throw rejects instead of returning streamed 200', async () => {
+    const setupError = new Error('setup-boom')
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(() => {
+      throw setupError
+    })
+
+    const router = await buildRouter()
+    const cleanup = vi.spyOn(router.serverSsr!, 'cleanup')
+    const originalServerSsr = router.serverSsr!
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      await expect(
+        renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      ).rejects.toThrow('setup-boom')
+
+      expect(cleanup).toHaveBeenCalledOnce()
+    } finally {
+      errorSpy.mockRestore()
+      originalServerSsr.cleanup()
+    }
+  })
+
+  test('request abort aborts pipeable and errors body', async () => {
+    const abort = vi.fn()
+    reactDomServerMocks.renderToPipeableStream.mockImplementationOnce(
+      (_children, opts) => {
+        queueMicrotask(() => opts.onShellReady())
+        return { abort, pipe: vi.fn() }
+      },
+    )
+
+    const router = await buildRouter()
+    const controller = new AbortController()
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/', {
+            signal: controller.signal,
+          }),
+          router,
+          responseHeaders: new Headers(),
+          children: null,
+        }),
+      )
+
+      controller.abort(new Error('request-gone'))
+      const terminated = await Promise.race<true | false>([
+        expectBodyRejects(response, 'request-gone').then(() => true),
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+      expect(terminated).toBe(true)
+      expect(abort).toHaveBeenCalledOnce()
+    } finally {
+      router.serverSsr?.cleanup()
+    }
+  })
+})
diff --git a/packages/router-core/src/router.ts b/packages/router-core/src/router.ts
index 14f086d0dc..2efb43cd42 100644
--- a/packages/router-core/src/router.ts
+++ b/packages/router-core/src/router.ts
@@ -345,9 +345,8 @@ export interface RouterOptions<
    * @link [API Docs](https://tanstack.com/router/latest/docs/framework/react/api/router/RouterOptionsType#dehydrate-method)
    * @link [Guide](https://tanstack.com/router/latest/docs/framework/react/guide/external-data-loading#critical-dehydrationhydration)
    */
-  dehydrate?: () => Constrain<
-    TDehydrated,
-    ValidateSerializableInput<Register, TDehydrated>
+  dehydrate?: () => Awaitable<
+    Constrain<TDehydrated, ValidateSerializableInput<Register, TDehydrated>>
   >
   /**
    * A function that will be called when the router is hydrated.
@@ -791,32 +790,47 @@ export type ClearCacheFn<TRouter extends AnyRouter> = (opts?: {
 }) => void
 
 export interface ServerSsr {
-  /**
-   * Injects HTML synchronously into the stream.
-   * Emits an onInjectedHtml event that listeners can handle.
-   * If no subscriber is listening, the HTML is buffered and can be retrieved via takeBufferedHtml().
-   */
+  /** Framework-only: injects router-owned HTML into the SSR stream. */
   injectHtml: (html: string) => void
-  /**
-   * Injects a script tag synchronously into the stream.
-   */
+  /** Framework-only: injects a router-owned script tag into the SSR stream. */
   injectScript: (script: string) => void
   isDehydrated: () => boolean
   isSerializationFinished: () => boolean
+  /** Framework-only: atomically reserves the pass-through stream path if safe. */
+  reserveStreamFastPath: () => boolean
+  /** Framework-only. */
+  onInjectedHtml: (listener: () => void) => () => void
+  /** Framework-only. */
   onRenderFinished: (listener: () => void) => void
+  /** Framework-only. */
   setRenderFinished: () => void
+  /** Framework-only. */
   cleanup: () => void
-  onSerializationFinished: (listener: () => void) => void
-  dehydrate: (opts?: { requestAssets?: ManifestRouteAssets }) => Promise<void>
-  takeBufferedScripts: () => RouterManagedTag | undefined
   /**
-   * Takes any buffered HTML that was injected.
-   * Returns the buffered HTML string (which may include multiple script tags) or undefined if empty.
+   * Register a listener invoked when the SSR request lifecycle ends (success,
+   * error, abort, or stream lifetime expiry). Use to tear down per-request
+   * resources whose references would otherwise pin the router (e.g. query
+   * cache subscriptions, gcTime timers, abort controllers).
+   *
+   * Listeners run synchronously and exactly once. Errors are caught and logged.
    */
+  onCleanup: (listener: () => void) => void
+  /** Framework-only. */
+  onSerializationFinished: (listener: () => void) => () => void
+  /** Framework-only. */
+  dehydrate: (opts?: { requestAssets?: ManifestRouteAssets }) => Promise<void>
+  /** Framework-only. */
+  takeBufferedScripts: () => RouterManagedTag | undefined
+  /** Framework-only: takes buffered router-owned HTML. */
   takeBufferedHtml: () => string | undefined
+  /** Framework-only. */
   liftScriptBarrier: () => void
 }
 
+export interface RouterSsrLifecycle {
+  onServerSsrAttach?: Array<(serverSsr: ServerSsr) => void>
+}
+
 export type AnyRouterWithContext<TContext> = RouterCore<
   AnyRouteWithContext<TContext>,
   any,
@@ -2977,6 +2991,8 @@ export class RouterCore<
 
   serverSsr?: ServerSsr
 
+  serverSsrLifecycle?: RouterSsrLifecycle
+
   hasNotFoundMatch = () => {
     return this.stores.matches
       .get()
diff --git a/packages/router-core/src/ssr/createRequestHandler.ts b/packages/router-core/src/ssr/createRequestHandler.ts
index 87ccb50c8a..32377b2bea 100644
--- a/packages/router-core/src/ssr/createRequestHandler.ts
+++ b/packages/router-core/src/ssr/createRequestHandler.ts
@@ -5,6 +5,7 @@ import {
   getNormalizedURL,
   getOrigin,
 } from './ssr-server'
+import { normalizeSsrResponse } from './handlerCallback'
 import type { HandlerCallback } from './handlerCallback'
 import type { AnyHeaders } from './headers'
 import type { AnyRouter } from '../router'
@@ -25,8 +26,7 @@ export function createRequestHandler<TRouter extends AnyRouter>({
 }): RequestHandler<TRouter> {
   return async (cb) => {
     const router = createRouter()
-    // Track whether the callback will handle cleanup
-    let cbWillCleanup = false
+    let responseOwnsCleanup = false
 
     try {
       attachRouterServerSsrUtils({
@@ -58,19 +58,19 @@ export function createRequestHandler<TRouter extends AnyRouter>({
         router,
       })
 
-      // Mark that the callback will handle cleanup
-      cbWillCleanup = true
-      return cb({
+      const response = await cb({
         request,
         router,
         responseHeaders,
       })
+      const ssrResponse = normalizeSsrResponse(response)
+      responseOwnsCleanup = ssrResponse.serverSsrCleanup === 'stream'
+      return ssrResponse.response
     } finally {
-      if (!cbWillCleanup) {
+      if (!responseOwnsCleanup) {
         // Clean up router SSR state if the callback won't handle it
         // (e.g., if an error occurred before the callback was invoked).
-        // When the callback runs, it handles cleanup (either via transformStreamWithRouter
-        // for streaming, or directly in renderRouterToString for non-streaming).
+        // Transformed streaming response bodies clean up when consumed/cancelled.
         router.serverSsr?.cleanup()
       }
     }
diff --git a/packages/router-core/src/ssr/handlerCallback.ts b/packages/router-core/src/ssr/handlerCallback.ts
index e9ae2cd3ba..22aa843063 100644
--- a/packages/router-core/src/ssr/handlerCallback.ts
+++ b/packages/router-core/src/ssr/handlerCallback.ts
@@ -1,11 +1,94 @@
 import type { AnyRouter } from '../router'
 
+export type SsrResponse =
+  | {
+      response: Response
+      serverSsrCleanup: 'none'
+    }
+  | {
+      response: Response
+      serverSsrCleanup: 'stream'
+      dispose: (reason?: unknown) => Promise<void>
+    }
+
+export type HandlerCallbackResult = Response | SsrResponse
+
+export function isSsrResponse(value: unknown): value is SsrResponse {
+  return (
+    typeof value === 'object' &&
+    value !== null &&
+    'response' in value &&
+    'serverSsrCleanup' in value
+  )
+}
+
+export function normalizeSsrResponse(
+  result: HandlerCallbackResult,
+): SsrResponse {
+  return isSsrResponse(result)
+    ? result
+    : { response: result, serverSsrCleanup: 'none' }
+}
+
+export function createSsrStreamResponse<TRouter extends AnyRouter>(
+  router: TRouter,
+  response: Response,
+): SsrResponse {
+  if (!response.body) {
+    throw new Error('Invariant failed: SSR stream response requires a body')
+  }
+
+  let disposed = false
+  return {
+    response,
+    serverSsrCleanup: 'stream',
+    async dispose(reason?: unknown) {
+      if (disposed) return
+      disposed = true
+
+      try {
+        await response.body!.cancel(reason)
+      } catch {
+        // ignore; fallback cleanup below still releases router SSR state
+      }
+
+      router.serverSsr?.cleanup()
+    },
+  }
+}
+
+export async function replaceSsrResponse(
+  result: HandlerCallbackResult,
+  response: Response,
+  reason?: unknown,
+): Promise<SsrResponse> {
+  const ssrResponse = normalizeSsrResponse(result)
+  if (ssrResponse.serverSsrCleanup === 'stream') {
+    await ssrResponse.dispose(reason)
+  }
+  return { response, serverSsrCleanup: 'none' }
+}
+
+export async function stripSsrResponseBody(
+  result: HandlerCallbackResult,
+  reason?: unknown,
+): Promise<SsrResponse> {
+  const ssrResponse = normalizeSsrResponse(result)
+  if (ssrResponse.serverSsrCleanup === 'stream') {
+    await ssrResponse.dispose(reason)
+  }
+  return {
+    response: new Response(null, ssrResponse.response),
+    serverSsrCleanup: 'none',
+  }
+}
+
 export interface HandlerCallback<TRouter extends AnyRouter> {
   (ctx: {
     request: Request
     router: TRouter
     responseHeaders: Headers
-  }): Response | Promise<Response>
+  }): HandlerCallbackResult | Promise<HandlerCallbackResult>
 }
 
 export function defineHandlerCallback<TRouter extends AnyRouter>(
diff --git a/packages/router-core/src/ssr/server.ts b/packages/router-core/src/ssr/server.ts
index 89b6059e6d..df5b838676 100644
--- a/packages/router-core/src/ssr/server.ts
+++ b/packages/router-core/src/ssr/server.ts
@@ -1,12 +1,24 @@
 export { createRequestHandler } from './createRequestHandler'
 export type { RequestHandler } from './createRequestHandler'
-export { defineHandlerCallback } from './handlerCallback'
-export type { HandlerCallback } from './handlerCallback'
+export {
+  createSsrStreamResponse,
+  defineHandlerCallback,
+  isSsrResponse,
+  normalizeSsrResponse,
+  replaceSsrResponse,
+  stripSsrResponseBody,
+} from './handlerCallback'
+export type {
+  HandlerCallback,
+  HandlerCallbackResult,
+  SsrResponse,
+} from './handlerCallback'
 export {
   transformPipeableStreamWithRouter,
   transformStreamWithRouter,
   transformReadableStreamWithRouter,
 } from './transformStreamWithRouter'
+export type { TransformStreamWithRouterOptions } from './transformStreamWithRouter'
 export {
   attachRouterServerSsrUtils,
   getNormalizedURL,
diff --git a/packages/router-core/src/ssr/ssr-server.ts b/packages/router-core/src/ssr/ssr-server.ts
index ce61ee2077..31db2f5e41 100644
--- a/packages/router-core/src/ssr/ssr-server.ts
+++ b/packages/router-core/src/ssr/ssr-server.ts
@@ -16,7 +16,7 @@ import { makeSsrSerovalPlugin } from './serializer/transformer'
 import type { LRUCache } from '../lru-cache'
 import type { DehydratedMatch, DehydratedRouter } from './types'
 import type { AnySerializationAdapter } from './serializer/transformer'
-import type { AnyRouter } from '../router'
+import type { AnyRouter, ServerSsr } from '../router'
 import type { AnyRouteMatch } from '../Matches'
 import type {
   Manifest,
@@ -26,21 +26,6 @@ import type {
   ServerManifest,
 } from '../manifest'
 
-declare module '../router' {
-  interface ServerSsr {
-    setRenderFinished: () => void
-    cleanup: () => void
-  }
-  interface RouterEvents {
-    onInjectedHtml: {
-      type: 'onInjectedHtml'
-    }
-    onSerializationFinished: {
-      type: 'onSerializationFinished'
-    }
-  }
-}
-
 const SCOPE_ID = 'tsr'
 
 const TSR_PREFIX = GLOBAL_TSR + '.router='
@@ -78,14 +63,15 @@ const INITIAL_SCRIPTS = [
 ]
 
 class ScriptBuffer {
-  private router: AnyRouter | undefined
+  private injectScript: ((script: string) => void) | undefined
   private _queue: Array<string>
   private _scriptBarrierLifted = false
   private _cleanedUp = false
-  private _pendingMicrotask = false
+  private _microtaskVersion = 0
+  private _pendingMicrotaskVersion = 0
 
-  constructor(router: AnyRouter) {
-    this.router = router
+  constructor(injectScript: (script: string) => void) {
+    this.injectScript = injectScript
     // Copy INITIAL_SCRIPTS to avoid mutating the shared array
     this._queue = INITIAL_SCRIPTS.slice()
   }
@@ -93,31 +79,39 @@ class ScriptBuffer {
   enqueue(script: string) {
     if (this._cleanedUp) return
     this._queue.push(script)
-    // If barrier is lifted, schedule injection (if not already scheduled)
-    if (this._scriptBarrierLifted && !this._pendingMicrotask) {
-      this._pendingMicrotask = true
-      queueMicrotask(() => {
-        this._pendingMicrotask = false
-        this.injectBufferedScripts()
-      })
+    if (this._scriptBarrierLifted) {
+      this.scheduleInjectBufferedScripts()
     }
   }
 
   liftBarrier() {
     if (this._scriptBarrierLifted || this._cleanedUp) return
     this._scriptBarrierLifted = true
-    if (this._queue.length > 0 && !this._pendingMicrotask) {
-      this._pendingMicrotask = true
-      queueMicrotask(() => {
-        this._pendingMicrotask = false
-        this.injectBufferedScripts()
-      })
+    if (this._queue.length > 0) {
+      this.scheduleInjectBufferedScripts()
     }
   }
 
+  scheduleInjectBufferedScripts() {
+    if (this._pendingMicrotaskVersion !== 0) return
+    const pendingVersion = ++this._microtaskVersion
+    this._pendingMicrotaskVersion = pendingVersion
+    queueMicrotask(() => {
+      if (this._pendingMicrotaskVersion !== pendingVersion) return
+      this._pendingMicrotaskVersion = 0
+      this.injectBufferedScripts()
+    })
+  }
+
+  clearPendingMicrotask() {
+    if (this._pendingMicrotaskVersion === 0) return
+    this._pendingMicrotaskVersion = 0
+    this._microtaskVersion++
+  }
+
   /**
    * Flushes any pending scripts synchronously.
-   * Call this before emitting onSerializationFinished to ensure all scripts are injected.
+   * Call this before signaling serialization finished to ensure all scripts are injected.
    *
    * IMPORTANT: Only injects if the barrier has been lifted. Before the barrier is lifted,
    * scripts should remain in the queue so takeBufferedScripts() can retrieve them
@@ -125,16 +119,17 @@ class ScriptBuffer {
   flush() {
     if (!this._scriptBarrierLifted) return
     if (this._cleanedUp) return
-    this._pendingMicrotask = false
-    const scriptsToInject = this.takeAll()
-    if (scriptsToInject && this.router?.serverSsr) {
-      this.router.serverSsr.injectScript(scriptsToInject)
-    }
+    this.clearPendingMicrotask()
+    this.injectBufferedScripts()
   }
 
   takeAll() {
-    const bufferedScripts = this._queue
-    this._queue = []
+    return this.takeScripts(this._queue.length)
+  }
+
+  takeScripts(count: number) {
+    if (count <= 0) return undefined
+    const bufferedScripts = this._queue.splice(0, count)
     if (bufferedScripts.length === 0) {
       return undefined
     }
@@ -146,20 +141,25 @@ class ScriptBuffer {
     return bufferedScripts.join(';') + ';document.currentScript.remove()'
   }
 
+  hasPending() {
+    return this._queue.length > 0
+  }
+
   injectBufferedScripts() {
     if (this._cleanedUp) return
     // Early return if queue is empty (avoids unnecessary takeAll() call)
     if (this._queue.length === 0) return
     const scriptsToInject = this.takeAll()
-    if (scriptsToInject && this.router?.serverSsr) {
-      this.router.serverSsr.injectScript(scriptsToInject)
+    if (scriptsToInject) {
+      this.injectScript?.(scriptsToInject)
     }
   }
 
   cleanup() {
     this._cleanedUp = true
+    this.clearPendingMicrotask()
     this._queue = []
-    this.router = undefined
+    this.injectScript = undefined
   }
 }
 
@@ -444,25 +444,48 @@ export function attachRouterServerSsrUtils({
   }
   let _dehydrated = false
   let _serializationFinished = false
+  let streamFastPathReserved = false
   const renderFinishedListeners: Array<() => void> = []
+  const injectedHtmlListeners: Array<() => void> = []
   const serializationFinishedListeners: Array<() => void> = []
-  const scriptBuffer = new ScriptBuffer(router)
+  const cleanupListeners: Array<() => void> = []
+  let cleanupStarted = false
   let injectedHtmlBuffer = ''
 
-  router.serverSsr = {
+  const callListeners = (listeners: Array<() => void>, errorPrefix: string) => {
+    const snapshot = listeners.slice()
+    for (const l of snapshot) {
+      try {
+        l()
+      } catch (err) {
+        console.error(`${errorPrefix}:`, err)
+      }
+    }
+  }
+
+  const removeListener = (
+    listeners: Array<() => void>,
+    listener: () => void,
+  ) => {
+    const index = listeners.indexOf(listener)
+    if (index >= 0) listeners.splice(index, 1)
+  }
+
+  const scriptBuffer = new ScriptBuffer((script) => {
+    serverSsr.injectScript(script)
+  })
+
+  const serverSsr: ServerSsr = {
     injectHtml: (html: string) => {
-      if (!html) return
+      if (!html || cleanupStarted) return
       // Buffer the HTML so it can be retrieved via takeBufferedHtml()
       injectedHtmlBuffer += html
-      // Emit event to notify subscribers that new HTML is available
-      router.emit({
-        type: 'onInjectedHtml',
-      })
+      callListeners(injectedHtmlListeners, 'SSR injected HTML listener error')
     },
     injectScript: (script: string) => {
-      if (!script) return
+      if (!script || cleanupStarted) return
       const html = `<script${router.options.ssr?.nonce ? ` nonce='${router.options.ssr.nonce}'` : ''}>${script}</script>`
-      router.serverSsr!.injectHtml(html)
+      serverSsr.injectHtml(html)
     },
     dehydrate: async (opts?: { requestAssets?: ManifestRouteAssets }) => {
       if (_dehydrated) {
@@ -537,19 +560,34 @@ export function attachRouterServerSsrUtils({
             .concat(defaultSerovalPlugins)
         : defaultSerovalPlugins
 
+      let serializationCompleteSignaled = false
       const signalSerializationComplete = () => {
+        if (serializationCompleteSignaled || cleanupStarted) return
+        serializationCompleteSignaled = true
         _serializationFinished = true
-        try {
-          serializationFinishedListeners.forEach((l) => l())
-          router.emit({ type: 'onSerializationFinished' })
-        } catch (err) {
-          console.error('Serialization listener error:', err)
-        } finally {
-          serializationFinishedListeners.length = 0
-          renderFinishedListeners.length = 0
+
+        const listeners = serializationFinishedListeners.slice()
+        serializationFinishedListeners.length = 0
+
+        for (const l of listeners) {
+          try {
+            l()
+          } catch (err) {
+            console.error('Serialization listener error:', err)
+          }
         }
       }
 
+      const finishScriptSerialization = () => {
+        if (serializationCompleteSignaled || cleanupStarted) return
+        scriptBuffer.enqueue(GLOBAL_TSR + '.e()')
+        // Must synchronously notify injected HTML listeners before signaling
+        // completion; otherwise the held </body> tail could flush ahead of the
+        // end script.
+        scriptBuffer.flush()
+        signalSerializationComplete()
+      }
+
       crossSerializeStream(dehydratedRouter, {
         refs: new Map(),
         plugins,
@@ -565,15 +603,11 @@ export function attachRouterServerSsrUtils({
           if (err && (err as any).stack) {
             console.error((err as any).stack)
           }
-          signalSerializationComplete()
+          finishScriptSerialization()
         },
         scopeId: SCOPE_ID,
         onDone: () => {
-          scriptBuffer.enqueue(GLOBAL_TSR + '.e()')
-          // Flush all pending scripts synchronously before signaling completion
-          // This ensures all scripts are injected before onSerializationFinished is emitted
-          scriptBuffer.flush()
-          signalSerializationComplete()
+          finishScriptSerialization()
         },
       })
     },
@@ -583,23 +617,65 @@ export function attachRouterServerSsrUtils({
     isSerializationFinished() {
       return _serializationFinished
     },
-    onRenderFinished: (listener) => renderFinishedListeners.push(listener),
-    onSerializationFinished: (listener) =>
-      serializationFinishedListeners.push(listener),
-    setRenderFinished: () => {
-      // Wrap in try-catch to ensure scriptBuffer.liftBarrier() is always called
-      try {
-        renderFinishedListeners.forEach((l) => l())
-      } catch (err) {
-        console.error('Error in render finished listener:', err)
-      } finally {
-        // Clear listeners after calling them to prevent memory leaks
-        renderFinishedListeners.length = 0
+    reserveStreamFastPath() {
+      if (
+        !cleanupStarted &&
+        _serializationFinished &&
+        !streamFastPathReserved &&
+        renderFinishedListeners.length === 0 &&
+        !injectedHtmlBuffer &&
+        !scriptBuffer.hasPending()
+      ) {
+        streamFastPathReserved = true
+        return true
+      }
+      return false
+    },
+    onInjectedHtml: (listener) => {
+      if (cleanupStarted) return () => {}
+      injectedHtmlListeners.push(listener)
+      return () => removeListener(injectedHtmlListeners, listener)
+    },
+    onRenderFinished: (listener) => {
+      if (cleanupStarted || streamFastPathReserved) return
+      renderFinishedListeners.push(listener)
+    },
+    onSerializationFinished: (listener) => {
+      if (cleanupStarted) return () => {}
+      if (_serializationFinished && !cleanupStarted) {
+        try {
+          listener()
+        } catch (err) {
+          console.error('Serialization listener error:', err)
+        }
+        return () => {}
       }
+      serializationFinishedListeners.push(listener)
+      return () => removeListener(serializationFinishedListeners, listener)
+    },
+    onCleanup: (listener) => {
+      if (cleanupStarted) return
+      cleanupListeners.push(listener)
+    },
+    setRenderFinished: () => {
+      if (cleanupStarted) return
       scriptBuffer.liftBarrier()
+      const listeners = renderFinishedListeners.slice()
+      renderFinishedListeners.length = 0
+      for (const l of listeners) {
+        try {
+          l()
+        } catch (err) {
+          console.error('Error in render finished listener:', err)
+        }
+      }
+      if (_serializationFinished) {
+        scriptBuffer.flush()
+      }
     },
     takeBufferedScripts() {
       const scripts = scriptBuffer.takeAll()
+      if (!scripts) return undefined
       const serverBufferedScript: RouterManagedTag = {
         tag: 'script',
         attrs: {
@@ -623,15 +699,37 @@ export function attachRouterServerSsrUtils({
       return buffered
     },
     cleanup() {
-      // Guard against multiple cleanup calls
-      if (!router.serverSsr) return
+      // Guard against multiple/reentrant cleanup calls. A listener could call
+      // cleanup() again indirectly; snapshot + clear before invoking so each
+      // listener runs exactly once and reentry is a no-op.
+      if (cleanupStarted) return
+      cleanupStarted = true
+      const listeners = cleanupListeners.slice()
+      cleanupListeners.length = 0
+      for (const l of listeners) {
+        try {
+          l()
+        } catch (err) {
+          console.error('Error in SSR cleanup listener:', err)
+        }
+      }
       renderFinishedListeners.length = 0
+      injectedHtmlListeners.length = 0
       serializationFinishedListeners.length = 0
       injectedHtmlBuffer = ''
       scriptBuffer.cleanup()
       router.serverSsr = undefined
     },
   }
+
+  router.serverSsr = serverSsr
+  for (const listener of router.serverSsrLifecycle?.onServerSsrAttach ?? []) {
+    try {
+      listener(serverSsr)
+    } catch (err) {
+      console.error('SSR attach listener error:', err)
+    }
+  }
 }
 
 /**
diff --git a/packages/router-core/src/ssr/transformStreamWithRouter.ts b/packages/router-core/src/ssr/transformStreamWithRouter.ts
index 753a1809ac..4393f955b3 100644
--- a/packages/router-core/src/ssr/transformStreamWithRouter.ts
+++ b/packages/router-core/src/ssr/transformStreamWithRouter.ts
@@ -3,264 +3,492 @@ import { Readable } from 'node:stream'
 import { TSR_SCRIPT_BARRIER_ID } from './constants'
 import type { AnyRouter } from '../router'
 
+export type TransformStreamWithRouterOptions = {
+  /** Timeout for serialization to complete after app render finishes (default: 60000ms) */
+  timeoutMs?: number
+  /** Maximum lifetime of the stream transform (default: 120000ms). Safety net for cleanup. */
+  lifetimeMs?: number
+  /**
+   * Called exactly once when the stream is torn down due to abort/error/
+   * cancel/timeout — NOT on natural successful completion. Use this to
+   * abort a hidden producer upstream of any PassThrough you passed in
+   * (e.g. React `renderToPipeableStream`'s `abort()`).
+   * Errors thrown from this callback are swallowed.
+   */
+  onAbort?: (reason?: unknown) => void
+}
+
 export function transformReadableStreamWithRouter(
   router: AnyRouter,
   routerStream: ReadableStream,
+  opts?: TransformStreamWithRouterOptions,
 ) {
-  return transformStreamWithRouter(router, routerStream)
+  return transformStreamWithRouter(router, routerStream, opts)
 }
 
 export function transformPipeableStreamWithRouter(
   router: AnyRouter,
   routerStream: Readable,
+  opts?: TransformStreamWithRouterOptions,
 ) {
   return Readable.fromWeb(
-    transformStreamWithRouter(router, Readable.toWeb(routerStream)),
+    transformStreamWithRouter(router, Readable.toWeb(routerStream), opts),
   )
 }
 
-// Use string constants for simple indexOf matching
-const BODY_END_TAG = '</body>'
-const HTML_END_TAG = '</html>'
-
 // Minimum length of a valid closing tag: </a> = 4 characters
 const MIN_CLOSING_TAG_LENGTH = 4
 
 // Default timeout values (in milliseconds)
 const DEFAULT_SERIALIZATION_TIMEOUT_MS = 60000
-const DEFAULT_LIFETIME_TIMEOUT_MS = 60000
+const DEFAULT_LIFETIME_TIMEOUT_MS = DEFAULT_SERIALIZATION_TIMEOUT_MS * 2
+const MAX_LEFTOVER_CHARS = 2048
+const MAX_TAIL_CHARS = 64 * 1024
+const MAX_ROUTER_HTML_CHARS = 16 * 1024 * 1024
+const MAX_PENDING_WRITE_CHARS = 16 * 1024 * 1024
+
+// Merge lifecycle: body bytes can stream, router HTML must precede tail,
+// terminal states own close/error/cleanup exactly once.
+const MergeState = {
+  ReadingBody: 0,
+  HoldingTail: 1,
+  AppDone: 2,
+  Draining: 3,
+  Done: 4,
+} as const
+
+type MergeState = (typeof MergeState)[keyof typeof MergeState]
 
 // Module-level encoder (stateless, safe to reuse)
 const textEncoder = new TextEncoder()
 
-/**
- * Finds the position just after the last valid HTML closing tag in the string.
- *
- * Valid closing tags match the pattern: </[a-zA-Z][\w:.-]*>
- * Examples: </div>, </my-component>, </slot:name.nested>
- *
- * @returns Position after the last closing tag, or -1 if none found
- */
-function findLastClosingTagEnd(str: string): number {
-  const len = str.length
-  if (len < MIN_CLOSING_TAG_LENGTH) return -1
-
-  let i = len - 1
-
-  while (i >= MIN_CLOSING_TAG_LENGTH - 1) {
-    // Look for > (charCode 62)
-    if (str.charCodeAt(i) === 62) {
-      // Look backwards for valid tag name characters
-      let j = i - 1
-
-      // Skip through valid tag name characters
-      while (j >= 1) {
-        const code = str.charCodeAt(j)
-        // Check if it's a valid tag name char: [a-zA-Z0-9_:.-]
-        if (
-          (code >= 97 && code <= 122) || // a-z
-          (code >= 65 && code <= 90) || // A-Z
-          (code >= 48 && code <= 57) || // 0-9
-          code === 95 || // _
-          code === 58 || // :
-          code === 46 || // .
-          code === 45 // -
-        ) {
-          j--
-        } else {
-          break
-        }
-      }
+const noop = () => {}
+const resolvedPromise = Promise.resolve()
+
+// Returns -bodyEndIndex - 2 when </body> is found; otherwise returns
+// the position after the last valid closing tag, or -1 when none exists.
+function findHtmlBoundary(str: string): number {
+  let lastClosingTagEnd = -1
+  let searchFrom = str.length - MIN_CLOSING_TAG_LENGTH
+
+  while (searchFrom >= 0) {
+    const openSlash = str.lastIndexOf('</', searchFrom)
+    if (openSlash === -1) break
+
+    // Fast case-insensitive match for </body>. Negative return encodes the
+    // body start index without allocating a result object.
+    if (
+      (str.charCodeAt(openSlash + 2) | 32) === 98 &&
+      (str.charCodeAt(openSlash + 3) | 32) === 111 &&
+      (str.charCodeAt(openSlash + 4) | 32) === 100 &&
+      (str.charCodeAt(openSlash + 5) | 32) === 121 &&
+      str.charCodeAt(openSlash + 6) === 62
+    ) {
+      return -openSlash - 2
+    }
 
-      // Check if the first char after </ is a valid start char (letter only)
-      const tagNameStart = j + 1
-      if (tagNameStart < i) {
-        const startCode = str.charCodeAt(tagNameStart)
-        // Tag name must start with a letter (a-z or A-Z)
-        if (
-          (startCode >= 97 && startCode <= 122) ||
-          (startCode >= 65 && startCode <= 90)
-        ) {
-          // Check for </ (charCodes: < = 60, / = 47)
+    if (lastClosingTagEnd === -1) {
+      let i = openSlash + 2
+      const startCode = str.charCodeAt(i)
+      if (
+        (startCode >= 97 && startCode <= 122) ||
+        (startCode >= 65 && startCode <= 90)
+      ) {
+        i++
+        while (i < str.length) {
+          const code = str.charCodeAt(i)
           if (
-            j >= 1 &&
-            str.charCodeAt(j) === 47 &&
-            str.charCodeAt(j - 1) === 60
+            (code >= 97 && code <= 122) || // a-z
+            (code >= 65 && code <= 90) || // A-Z
+            (code >= 48 && code <= 57) || // 0-9
+            code === 95 || // _
+            code === 58 || // :
+            code === 46 || // .
+            code === 45 // -
           ) {
-            return i + 1 // Return position after the closing >
+            i++
+          } else {
+            break
           }
         }
+
+        if (str.charCodeAt(i) === 62) {
+          lastClosingTagEnd = i + 1
+        }
       }
     }
-    i--
+
+    searchFrom = openSlash - 1
+  }
+
+  return lastClosingTagEnd
+}
+
+/**
+ * Releasing the lock can throw if a pending read is still settling or if the
+ * lock was already released.
+ */
+type ReaderOps = {
+  cancel: (reason?: unknown) => Promise<unknown>
+  releaseLock: () => void
+}
+
+function safeReleaseReader(reader: ReaderOps) {
+  try {
+    reader.releaseLock()
+    return true
+  } catch {
+    return false
+  }
+}
+
+/**
+ * Cancel a reader without producing an unhandled rejection. `reader.cancel()`
+ * can reject (e.g. when the underlying source's cancel() throws), and
+ * downstream cancel() should still wait for upstream teardown when possible.
+ */
+function safeCancelReader(reader: ReaderOps, reason?: unknown): Promise<void> {
+  let cancelPromise: Promise<unknown> | undefined
+  try {
+    cancelPromise = reader.cancel(reason)
+  } catch {
+    // ignore
+  }
+
+  if (!safeReleaseReader(reader) && cancelPromise) {
+    return cancelPromise.then(noop, noop).then(() => {
+      safeReleaseReader(reader)
+    })
+  }
+
+  return cancelPromise ? cancelPromise.then(noop, noop) : resolvedPromise
+}
+
+function createReaderState<T>(appStream: ReadableStream<T>) {
+  const reader = appStream.getReader()
+  let released = false
+
+  return {
+    reader,
+    cancel: (reason?: unknown) => {
+      if (released) return resolvedPromise
+      released = true
+      return safeCancelReader(reader, reason)
+    },
+    release: () => {
+      if (released) return
+      released = true
+      safeReleaseReader(reader)
+    },
+  }
+}
+
+function createAbortNotifier(opts?: TransformStreamWithRouterOptions) {
+  let abortNotified = false
+  return (reason?: unknown) => {
+    if (abortNotified) return
+    abortNotified = true
+    try {
+      opts?.onAbort?.(reason)
+    } catch {
+      // swallow user errors
+    }
   }
-  return -1
 }
 
 export function transformStreamWithRouter(
   router: AnyRouter,
   appStream: ReadableStream,
-  opts?: {
-    /** Timeout for serialization to complete after app render finishes (default: 60000ms) */
-    timeoutMs?: number
-    /** Maximum lifetime of the stream transform (default: 60000ms). Safety net for cleanup. */
-    lifetimeMs?: number
-  },
+  opts?: TransformStreamWithRouterOptions,
 ) {
-  // Check upfront if serialization already finished synchronously
-  // This is the fast path for routes with no deferred data
-  const serializationAlreadyFinished =
-    router.serverSsr?.isSerializationFinished() ?? false
-
-  // Take any HTML that was buffered before we started listening
-  const initialBufferedHtml = router.serverSsr?.takeBufferedHtml()
-
-  // True passthrough: if serialization already finished and nothing buffered,
-  // we can avoid any decoding/scanning while still honoring cleanup + setRenderFinished.
-  if (serializationAlreadyFinished && !initialBufferedHtml) {
-    let cleanedUp = false
-    let controller: ReadableStreamDefaultController<Uint8Array> | undefined
-    let isStreamClosed = false
-    let lifetimeTimeoutHandle: ReturnType<typeof setTimeout> | undefined
-
-    const cleanup = () => {
-      if (cleanedUp) return
-      cleanedUp = true
+  const serverSsr = router.serverSsr
+  if (!serverSsr) {
+    throw new Error('Invariant failed: router.serverSsr is required')
+  }
+  if (serverSsr.reserveStreamFastPath()) {
+    return makeFastPathStream(appStream, opts, serverSsr)
+  }
 
-      if (lifetimeTimeoutHandle !== undefined) {
-        clearTimeout(lifetimeTimeoutHandle)
-        lifetimeTimeoutHandle = undefined
-      }
+  return makeMainStream(serverSsr, appStream, opts)
+}
 
-      router.serverSsr?.cleanup()
+// =====================================================================
+// Fast path: passthrough with cleanup + backpressure on app reads.
+// =====================================================================
+function makeFastPathStream(
+  appStream: ReadableStream<Uint8Array>,
+  opts?: TransformStreamWithRouterOptions,
+  serverSsr?: NonNullable<AnyRouter['serverSsr']>,
+) {
+  let cleanedUp = false
+  let controller: ReadableStreamDefaultController<Uint8Array> | undefined
+  let state: MergeState = MergeState.ReadingBody
+  let lifetimeTimeoutHandle: ReturnType<typeof setTimeout> | undefined
+  let stopListeningToInjectedHtml: (() => void) | undefined
+  const readerState = createReaderState(appStream)
+  const notifyAbort = createAbortNotifier(opts)
+  const isDone = () => state === MergeState.Done
+  let renderFinished = false
+
+  const finishSsrRendering = () => {
+    if (!serverSsr || renderFinished) return true
+    renderFinished = true
+    try {
+      serverSsr.setRenderFinished()
+      return true
+    } catch (error) {
+      safeError(error)
+      cleanup(error)
+      return false
     }
+  }
 
-    const safeClose = () => {
-      if (isStreamClosed) return
-      isStreamClosed = true
-      try {
-        controller?.close()
-      } catch {
-        // ignore
-      }
+  const cleanup = (reason?: unknown, cancelReader = true) => {
+    if (cleanedUp) return resolvedPromise
+    cleanedUp = true
+
+    if (lifetimeTimeoutHandle !== undefined) {
+      clearTimeout(lifetimeTimeoutHandle)
+      lifetimeTimeoutHandle = undefined
+    }
+    try {
+      stopListeningToInjectedHtml?.()
+    } catch {
+      // ignore
     }
+    stopListeningToInjectedHtml = undefined
 
-    const safeError = (error: unknown) => {
-      if (isStreamClosed) return
-      isStreamClosed = true
+    if (cancelReader) {
+      // Notify the producer immediately. Reader cancellation may take time to
+      // settle, and upstream renderers must tolerate abort + cancel overlap.
+      notifyAbort(reason)
+    }
+    const readerDone = cancelReader
+      ? readerState.cancel(reason)
+      : (readerState.release(), resolvedPromise)
+    if (serverSsr) {
       try {
-        controller?.error(error)
-      } catch {
-        // ignore
+        serverSsr.cleanup()
+      } catch (error) {
+        console.error('Error in SSR cleanup:', error)
       }
     }
+    return readerDone
+  }
 
-    const lifetimeMs = opts?.lifetimeMs ?? DEFAULT_LIFETIME_TIMEOUT_MS
-    lifetimeTimeoutHandle = setTimeout(() => {
-      if (!cleanedUp && !isStreamClosed) {
-        console.warn(
-          `SSR stream transform exceeded maximum lifetime (${lifetimeMs}ms), forcing cleanup`,
-        )
-        safeError(new Error('Stream lifetime exceeded'))
-        cleanup()
-      }
-    }, lifetimeMs)
-
-    const stream = new ReadableStream<Uint8Array>({
-      start(c: ReadableStreamDefaultController<Uint8Array>) {
-        controller = c
-      },
-      cancel() {
-        isStreamClosed = true
-        cleanup()
-      },
+  const safeClose = () => {
+    if (isDone()) return
+    state = MergeState.Done
+    try {
+      controller?.close()
+    } catch {
+      // ignore
+    }
+  }
+
+  const safeError = (error: unknown) => {
+    if (isDone()) return
+    state = MergeState.Done
+    try {
+      controller?.error(error)
+    } catch {
+      // ignore
+    }
+  }
+
+  if (serverSsr) {
+    stopListeningToInjectedHtml = serverSsr.onInjectedHtml(() => {
+      const err = new Error('SSR router HTML injected during fast path')
+      safeError(err)
+      cleanup(err)
     })
+  }
+
+  const lifetimeMs = opts?.lifetimeMs ?? DEFAULT_LIFETIME_TIMEOUT_MS
+  lifetimeTimeoutHandle = setTimeout(() => {
+    if (!cleanedUp && !isDone()) {
+      const err = new Error('Stream lifetime exceeded')
+      console.warn(
+        `SSR stream transform exceeded maximum lifetime (${lifetimeMs}ms), forcing cleanup`,
+      )
+      safeError(err)
+      cleanup(err)
+    }
+  }, lifetimeMs)
 
-    ;(async () => {
-      const reader = appStream.getReader()
+  const stream = new ReadableStream<Uint8Array>({
+    start(c) {
+      controller = c
+    },
+    async pull(c) {
+      if (cleanedUp || isDone()) return
       try {
-        while (true) {
-          const { done, value } = await reader.read()
-          if (done) break
-          if (cleanedUp || isStreamClosed) return
-          controller?.enqueue(value as unknown as Uint8Array)
+        const { done, value } = await readerState.reader.read()
+        if (!done) {
+          if (!cleanedUp && !isDone()) {
+            c.enqueue(value)
+          }
+          return
         }
 
-        if (cleanedUp || isStreamClosed) return
+        if (cleanedUp || isDone()) return
 
-        router.serverSsr?.setRenderFinished()
+        if (!finishSsrRendering()) return
         safeClose()
-        cleanup()
+        return cleanup(undefined, false)
       } catch (error) {
         if (cleanedUp) return
         console.error('Error reading appStream:', error)
-        router.serverSsr?.setRenderFinished()
+        if (state < MergeState.AppDone) {
+          try {
+            serverSsr?.setRenderFinished()
+          } catch {
+            // ignore
+          }
+        }
         safeError(error)
-        cleanup()
+        return cleanup(error)
       } finally {
-        reader.releaseLock()
+        if (cleanedUp || isDone()) {
+          readerState.release()
+        }
       }
-    })().catch((error) => {
-      if (cleanedUp) return
-      console.error('Error in stream transform:', error)
-      safeError(error)
-      cleanup()
-    })
+    },
+    cancel(reason) {
+      state = MergeState.Done
+      return cleanup(reason)
+    },
+  })
 
-    return stream
-  }
+  return stream
+}
 
+// =====================================================================
+// Main path: scan + inject router HTML/scripts with full backpressure.
+//
+// ALL output (app chunks AND router-injected HTML/scripts) flows through a
+// single pendingWrites queue and is only enqueued onto the downstream
+// controller when desiredSize > 0. This prevents native-memory growth of
+// queued Uint8Arrays under slow HTTP consumers.
+// =====================================================================
+function makeMainStream(
+  serverSsr: NonNullable<AnyRouter['serverSsr']>,
+  appStream: ReadableStream,
+  opts?: TransformStreamWithRouterOptions,
+) {
   let stopListeningToInjectedHtml: (() => void) | undefined
   let stopListeningToSerializationFinished: (() => void) | undefined
   let serializationTimeoutHandle: ReturnType<typeof setTimeout> | undefined
   let lifetimeTimeoutHandle: ReturnType<typeof setTimeout> | undefined
   let cleanedUp = false
 
-  let controller: ReadableStreamDefaultController<any>
-  let isStreamClosed = false
-
-  const textDecoder = new TextDecoder()
-
-  // concat'd router HTML; avoids array joins on each flush
-  let pendingRouterHtml = initialBufferedHtml ?? ''
-
-  // between-chunk text buffer; keep bounded to avoid unbounded memory
-  let leftover = ''
-
-  // captured closing tags from </body> onward
-  let pendingClosingTags = ''
+  let controller: ReadableStreamDefaultController<Uint8Array> | undefined
+  let closeWhenDrained = false
+  let state: MergeState = MergeState.ReadingBody
+
+  const readerState = createReaderState(appStream)
+  const notifyAbort = createAbortNotifier(opts)
+
+  // Single output queue: app chunks + router-injected HTML/scripts.
+  // Stored as STRINGS to avoid holding native-backed Uint8Arrays in our queue
+  // while waiting for downstream capacity. Encoding happens at enqueue time
+  // (drainPending) so the bytes live only inside the controller's internal
+  // queue, not in two places.
+  //
+  // Uses an index pointer instead of Array.prototype.shift() (which is O(n))
+  // so many small router-injected script chunks stay O(1) per chunk.
+  const pendingWrites: Array<string> = []
+  let pendingWriteHead = 0
+  let pendingWriteChars = 0
+
+  function clearPending() {
+    pendingWrites.length = 0
+    pendingWriteHead = 0
+    pendingWriteChars = 0
+  }
 
-  // conservative cap: enough to hold any partial closing tag + a bit
-  const MAX_LEFTOVER_CHARS = 2048
+  // Backpressure: pull() resolves drainResolve to let the read loop advance.
+  let drainResolve: (() => void) | null = null
+  const waitForDrain = () =>
+    new Promise<void>((r) => {
+      drainResolve = r
+    })
+  const signalDrain = () => {
+    if (drainResolve) {
+      const r = drainResolve
+      drainResolve = null
+      r()
+    }
+  }
 
-  let isAppRendering = true
-  let streamBarrierLifted = false
-  let serializationFinished = serializationAlreadyFinished
+  const isDone = () => state === MergeState.Done
+
+  function drainPending() {
+    if (!controller || isDone()) return
+    while (pendingWriteHead < pendingWrites.length) {
+      const ds = controller.desiredSize
+      if (ds !== null && ds <= 0) return
+      const next = pendingWrites[pendingWriteHead]!
+      // Release reference for GC; compact when fully drained.
+      pendingWrites[pendingWriteHead] = ''
+      pendingWriteHead++
+      pendingWriteChars -= next.length
+      try {
+        controller.enqueue(textEncoder.encode(next))
+      } catch (error) {
+        safeError(error)
+        cleanup(error)
+        return
+      }
+    }
+    // Fully drained: reset array so it doesn't grow unbounded across SSR.
+    if (pendingWriteHead >= pendingWrites.length) {
+      pendingWrites.length = 0
+      pendingWriteHead = 0
+    }
+    // If we've flushed everything and tryFinish requested close, close now.
+    if (closeWhenDrained && pendingWriteHead >= pendingWrites.length) {
+      closeWhenDrained = false
+      safeClose()
+      cleanup(undefined, false)
+    }
+  }
 
-  function safeEnqueue(chunk: string | Uint8Array) {
-    if (isStreamClosed) return
-    if (typeof chunk === 'string') {
-      controller.enqueue(textEncoder.encode(chunk))
-    } else {
-      controller.enqueue(chunk)
+  /**
+   * Enqueue a string chunk through the backpressure queue. Stored as a
+   * string and encoded only when the downstream actually accepts the chunk
+   * — keeps native-memory pressure inside the controller's queue (which
+   * honors desiredSize) rather than ours.
+   */
+  function writeChunk(chunk: string) {
+    if (cleanedUp || isDone()) return
+    if (!chunk.length) return
+    if (pendingWriteChars + chunk.length > MAX_PENDING_WRITE_CHARS) {
+      const err = new Error('SSR stream pending output exceeded maximum buffer')
+      safeError(err)
+      cleanup(err)
+      return
     }
+    pendingWrites.push(chunk)
+    pendingWriteChars += chunk.length
+    drainPending()
   }
 
   function safeClose() {
-    if (isStreamClosed) return
-    isStreamClosed = true
+    if (isDone()) return
+    state = MergeState.Done
     try {
-      controller.close()
+      controller?.close()
     } catch {
       // ignore
     }
   }
 
   function safeError(error: unknown) {
-    if (isStreamClosed) return
-    isStreamClosed = true
+    if (isDone()) return
+    state = MergeState.Done
     try {
-      controller.error(error)
+      controller?.error(error)
     } catch {
       // ignore
     }
@@ -269,8 +497,8 @@ export function transformStreamWithRouter(
   /**
    * Cleanup with guards; must be idempotent.
    */
-  function cleanup() {
-    if (cleanedUp) return
+  function cleanup(reason?: unknown, cancelReader = true) {
+    if (cleanedUp) return resolvedPromise
     cleanedUp = true
 
     try {
@@ -291,155 +519,317 @@ export function transformStreamWithRouter(
       lifetimeTimeoutHandle = undefined
     }
 
-    pendingRouterHtml = ''
+    clearPendingRouterHtml()
     leftover = ''
-    pendingClosingTags = ''
+    pendingTail = ''
+    clearPending()
+
+    if (cancelReader) {
+      // Notify the producer immediately. Reader cancellation may take time to
+      // settle, and upstream renderers must tolerate abort + cancel overlap.
+      notifyAbort(reason)
+    }
+    const readerDone = cancelReader
+      ? readerState.cancel(reason)
+      : (readerState.release(), resolvedPromise)
+    signalDrain()
+    try {
+      serverSsr.cleanup()
+    } catch (error) {
+      console.error('Error in SSR cleanup:', error)
+    }
+    return readerDone
+  }
+
+  const textDecoder = new TextDecoder()
+
+  // Router-injected scripts/HTML waiting for the next safe body boundary.
+  // Keep chunks separate so flushing does not flatten a large rope string.
+  const pendingRouterHtml: Array<string> = []
+  let pendingRouterHtmlChars = 0
 
-    router.serverSsr?.cleanup()
+  // between-chunk text buffer; keep bounded to avoid unbounded memory
+  let leftover = ''
+
+  // captured bytes from </body> onward; must stay behind router scripts.
+  let pendingTail = ''
+
+  let streamBarrierLifted = false
+  let streamBarrierMarkerSeen = false
+  let serializationFinished = false
+
+  function noteBarrierMarker(chunk: string) {
+    if (streamBarrierMarkerSeen) return
+    if (chunk.includes(TSR_SCRIPT_BARRIER_ID)) {
+      streamBarrierMarkerSeen = true
+    }
   }
 
-  const stream = new ReadableStream({
-    start(c: ReadableStreamDefaultController<any>) {
+  function liftBarrierAfterBoundary() {
+    if (streamBarrierLifted) return
+    if (!streamBarrierMarkerSeen) return
+    streamBarrierLifted = true
+    serverSsr.liftScriptBarrier()
+  }
+
+  const stream = new ReadableStream<Uint8Array>({
+    start(c) {
       controller = c
+      // If anything queued before start (shouldn't happen but be safe), drain.
+      drainPending()
+    },
+    pull() {
+      // Consumer has capacity; flush queue then unblock read loop.
+      drainPending()
+      signalDrain()
     },
-    cancel() {
-      isStreamClosed = true
-      cleanup()
+    cancel(reason) {
+      state = MergeState.Done
+      return cleanup(reason)
     },
   })
 
+  function drainRouterHtml() {
+    if (cleanedUp || isDone()) return
+    let html: string | undefined
+    try {
+      html = serverSsr.takeBufferedHtml()
+    } catch (error) {
+      safeError(error)
+      cleanup(error)
+      return
+    }
+    if (!html) return
+    if (state >= MergeState.Draining) {
+      // At this point final tail/close has already been queued. Emitting late
+      // router HTML would put scripts after </body> or drop them silently.
+      const err = new Error(
+        'SSR router HTML injected after stream finalization',
+      )
+      safeError(err)
+      cleanup(err)
+      return
+    }
+    if (state === MergeState.HoldingTail) {
+      flushPendingRouterHtml()
+      writeChunk(html)
+    } else {
+      if (pendingRouterHtmlChars + html.length > MAX_ROUTER_HTML_CHARS) {
+        const err = new Error('SSR router HTML exceeded maximum buffer')
+        safeError(err)
+        cleanup(err)
+        return
+      }
+      pendingRouterHtml.push(html)
+      pendingRouterHtmlChars += html.length
+    }
+  }
+
   function flushPendingRouterHtml() {
-    if (!pendingRouterHtml) return
-    safeEnqueue(pendingRouterHtml)
-    pendingRouterHtml = ''
+    if (!pendingRouterHtml.length) return
+    for (const html of pendingRouterHtml) {
+      writeChunk(html)
+    }
+    clearPendingRouterHtml()
   }
 
-  function appendRouterHtml(html: string) {
-    if (!html) return
-    pendingRouterHtml += html
+  function clearPendingRouterHtml() {
+    pendingRouterHtml.length = 0
+    pendingRouterHtmlChars = 0
+  }
+
+  function appendTail(chunk: string) {
+    pendingTail += chunk
+    if (pendingTail.length > MAX_TAIL_CHARS) {
+      throw new Error('SSR stream tail exceeded maximum buffer')
+    }
+  }
+
+  function waitForBackpressure() {
+    return !!(
+      controller &&
+      controller.desiredSize !== null &&
+      controller.desiredSize <= 0
+    )
+  }
+
+  function startSerializationTimeout() {
+    if (cleanedUp || isDone()) return
+    if (serializationTimeoutHandle !== undefined) return
+    const timeoutMs = opts?.timeoutMs ?? DEFAULT_SERIALIZATION_TIMEOUT_MS
+    serializationTimeoutHandle = setTimeout(() => {
+      if (!cleanedUp && !isDone()) {
+        const err = new Error('Serialization timeout after app render finished')
+        console.error('Serialization timeout after app render finished')
+        safeError(err)
+        cleanup(err)
+      }
+    }, timeoutMs)
   }
 
   /**
-   * Finish only when app done and serialization complete.
+   * Finish only when app done and serialization complete. Queues final
+   * output and requests close-when-drained so we don't close ahead of
+   * pending writes still waiting on downstream capacity.
    */
   function tryFinish() {
-    if (isAppRendering || !serializationFinished) return
-    if (cleanedUp || isStreamClosed) return
+    if (state !== MergeState.AppDone || !serializationFinished) return
+    if (cleanedUp || isDone()) return
 
     if (serializationTimeoutHandle !== undefined) {
       clearTimeout(serializationTimeoutHandle)
       serializationTimeoutHandle = undefined
     }
 
+    drainRouterHtml()
+    if (cleanedUp || isDone()) return
+
     // Flush any remaining bytes in the TextDecoder
     const decoderRemainder = textDecoder.decode()
 
-    if (leftover) safeEnqueue(leftover)
-    if (decoderRemainder) safeEnqueue(decoderRemainder)
+    if (leftover) writeChunk(leftover)
+    if (cleanedUp || isDone()) return
+    if (decoderRemainder) writeChunk(decoderRemainder)
+    if (cleanedUp || isDone()) return
     flushPendingRouterHtml()
-    if (pendingClosingTags) safeEnqueue(pendingClosingTags)
+    if (cleanedUp || isDone()) return
+    if (pendingTail) writeChunk(pendingTail)
+    if (cleanedUp || isDone()) return
+
+    leftover = ''
+    pendingTail = ''
 
-    safeClose()
-    cleanup()
+    state = MergeState.Draining
+    closeWhenDrained = true
+    // Try immediately; if queue not drained yet, pull() will retry.
+    drainPending()
+  }
+
+  function finishAppRendering() {
+    if (state >= MergeState.AppDone) return
+    state = MergeState.AppDone
+    try {
+      serverSsr.setRenderFinished()
+    } catch (error) {
+      safeError(error)
+      cleanup(error)
+      return
+    }
+    drainRouterHtml()
+    if (cleanedUp || isDone()) return
+    serializationFinished =
+      serializationFinished || serverSsr.isSerializationFinished()
+    if (serializationFinished) {
+      tryFinish()
+    } else {
+      startSerializationTimeout()
+    }
   }
 
   // Safety net: cleanup even if consumer never reads
-  const lifetimeMs = opts?.lifetimeMs ?? DEFAULT_LIFETIME_TIMEOUT_MS
+  const timeoutMs = opts?.timeoutMs ?? DEFAULT_SERIALIZATION_TIMEOUT_MS
+  const lifetimeMs = opts?.lifetimeMs ?? timeoutMs * 2
   lifetimeTimeoutHandle = setTimeout(() => {
-    if (!cleanedUp && !isStreamClosed) {
+    if (!cleanedUp && !isDone()) {
+      const err = new Error('Stream lifetime exceeded')
       console.warn(
         `SSR stream transform exceeded maximum lifetime (${lifetimeMs}ms), forcing cleanup`,
       )
-      safeError(new Error('Stream lifetime exceeded'))
-      cleanup()
+      safeError(err)
+      cleanup(err)
     }
   }, lifetimeMs)
 
-  if (!serializationAlreadyFinished) {
-    stopListeningToInjectedHtml = router.subscribe('onInjectedHtml', () => {
-      if (cleanedUp || isStreamClosed) return
-      const html = router.serverSsr?.takeBufferedHtml()
-      if (!html) return
-
-      // If we've already captured </body> (pendingClosingTags), we must keep appending
-      // so injection stays before the stored closing tags.
-      if (isAppRendering || leftover || pendingClosingTags) {
-        appendRouterHtml(html)
-      } else {
-        // App is done rendering - flush any pending buffer first to maintain order,
-        // then write the new HTML directly
-        flushPendingRouterHtml()
-        safeEnqueue(html)
-      }
-    })
+  stopListeningToInjectedHtml = serverSsr.onInjectedHtml(() => {
+    drainRouterHtml()
+  })
 
-    stopListeningToSerializationFinished = router.subscribe(
-      'onSerializationFinished',
-      () => {
-        serializationFinished = true
-        tryFinish()
-      },
-    )
+  stopListeningToSerializationFinished = serverSsr.onSerializationFinished(
+    () => {
+      serializationFinished = true
+      drainRouterHtml()
+      tryFinish()
+    },
+  )
+
+  // Subscriptions are installed before snapshots, so missed events are
+  // recovered by these synchronous drains/rechecks.
+  drainRouterHtml()
+  if (cleanedUp || isDone()) return stream
+  serializationFinished =
+    serializationFinished || serverSsr.isSerializationFinished()
+  if (serializationFinished) {
+    drainRouterHtml()
+    if (cleanedUp || isDone()) return stream
   }
 
   // Transform the appStream
   ;(async () => {
-    const reader = appStream.getReader()
     try {
       while (true) {
-        const { done, value } = await reader.read()
+        // Backpressure: pause upstream reads while downstream is full.
+        if (waitForBackpressure()) {
+          await waitForDrain()
+          if (cleanedUp || isDone()) return
+        }
+
+        const { done, value } = await readerState.reader.read()
         if (done) break
 
-        if (cleanedUp || isStreamClosed) return
+        if (cleanedUp || isDone()) return
 
         const text =
-          value instanceof Uint8Array
-            ? textDecoder.decode(value, { stream: true })
-            : String(value)
+          typeof value === 'string'
+            ? value
+            : textDecoder.decode(value as ArrayBufferView, { stream: true })
 
-        // Fast path: most chunks have no pending left-over.
         const chunkString = leftover ? leftover + text : text
 
-        if (!streamBarrierLifted) {
-          if (chunkString.includes(TSR_SCRIPT_BARRIER_ID)) {
-            streamBarrierLifted = true
-            router.serverSsr?.liftScriptBarrier()
-          }
-        }
-
-        // If we already saw </body>, everything else is part of tail; buffer it.
-        if (pendingClosingTags) {
-          pendingClosingTags += chunkString
+        // If we already saw </body>, everything else is tail. Keep it bounded
+        // and held until router scripts are ready so injection remains before </body>.
+        if (state >= MergeState.HoldingTail) {
+          appendTail(chunkString)
           leftover = ''
           continue
         }
 
-        const bodyEndIndex = chunkString.indexOf(BODY_END_TAG)
-        const htmlEndIndex = chunkString.indexOf(HTML_END_TAG)
-
-        if (
-          bodyEndIndex !== -1 &&
-          htmlEndIndex !== -1 &&
-          bodyEndIndex < htmlEndIndex
-        ) {
-          pendingClosingTags = chunkString.slice(bodyEndIndex)
-          safeEnqueue(chunkString.slice(0, bodyEndIndex))
+        const boundary = findHtmlBoundary(chunkString)
+        if (boundary < -1) {
+          const bodyEndIndex = -boundary - 2
+          state = MergeState.HoldingTail
+          appendTail(chunkString.slice(bodyEndIndex))
+          const bodyChunk = chunkString.slice(0, bodyEndIndex)
+          writeChunk(bodyChunk)
+          if (cleanedUp || isDone()) return
+          noteBarrierMarker(bodyChunk)
+          liftBarrierAfterBoundary()
+          if (cleanedUp || isDone()) return
           flushPendingRouterHtml()
           leftover = ''
           continue
         }
 
-        const lastClosingTagEnd = findLastClosingTagEnd(chunkString)
+        const lastClosingTagEnd = boundary
 
         if (lastClosingTagEnd > 0) {
-          safeEnqueue(chunkString.slice(0, lastClosingTagEnd))
+          const safeChunk = chunkString.slice(0, lastClosingTagEnd)
+          writeChunk(safeChunk)
+          if (cleanedUp || isDone()) return
+          noteBarrierMarker(safeChunk)
+          liftBarrierAfterBoundary()
+          if (cleanedUp || isDone()) return
           flushPendingRouterHtml()
 
           leftover = chunkString.slice(lastClosingTagEnd)
           if (leftover.length > MAX_LEFTOVER_CHARS) {
             // Ensure bounded memory even if a consumer streams long text sequences
             // without any closing tags. This may reduce injection granularity but is correct.
-            safeEnqueue(leftover.slice(0, leftover.length - MAX_LEFTOVER_CHARS))
+            noteBarrierMarker(leftover)
+            const flushed = leftover.slice(
+              0,
+              leftover.length - MAX_LEFTOVER_CHARS,
+            )
+            writeChunk(flushed)
             leftover = leftover.slice(-MAX_LEFTOVER_CHARS)
           }
         } else {
@@ -447,8 +837,10 @@ export function transformStreamWithRouter(
           // but stream older bytes to prevent unbounded buffering.
           const combined = chunkString
           if (combined.length > MAX_LEFTOVER_CHARS) {
+            noteBarrierMarker(combined)
             const flushUpto = combined.length - MAX_LEFTOVER_CHARS
-            safeEnqueue(combined.slice(0, flushUpto))
+            const flushed = combined.slice(0, flushUpto)
+            writeChunk(flushed)
             leftover = combined.slice(flushUpto)
           } else {
             leftover = combined
@@ -456,40 +848,29 @@ export function transformStreamWithRouter(
         }
       }
 
-      if (cleanedUp || isStreamClosed) return
+      if (cleanedUp || isDone()) return
 
-      isAppRendering = false
-      router.serverSsr?.setRenderFinished()
-
-      if (serializationFinished) {
-        tryFinish()
-      } else {
-        const timeoutMs = opts?.timeoutMs ?? DEFAULT_SERIALIZATION_TIMEOUT_MS
-        serializationTimeoutHandle = setTimeout(() => {
-          if (!cleanedUp && !isStreamClosed) {
-            console.error('Serialization timeout after app render finished')
-            safeError(
-              new Error('Serialization timeout after app render finished'),
-            )
-            cleanup()
-          }
-        }, timeoutMs)
-      }
+      finishAppRendering()
     } catch (error) {
       if (cleanedUp) return
       console.error('Error reading appStream:', error)
-      isAppRendering = false
-      router.serverSsr?.setRenderFinished()
+      if (state < MergeState.AppDone) {
+        try {
+          serverSsr.setRenderFinished()
+        } catch {
+          // ignore
+        }
+      }
       safeError(error)
-      cleanup()
+      cleanup(error)
     } finally {
-      reader.releaseLock()
+      readerState.release()
     }
   })().catch((error) => {
     if (cleanedUp) return
     console.error('Error in stream transform:', error)
     safeError(error)
-    cleanup()
+    cleanup(error)
   })
 
   return stream
diff --git a/packages/router-core/tests/closing-tag-detection.bench.ts b/packages/router-core/tests/closing-tag-detection.bench.ts
index a924256dc2..5a52f6c580 100644
--- a/packages/router-core/tests/closing-tag-detection.bench.ts
+++ b/packages/router-core/tests/closing-tag-detection.bench.ts
@@ -1,5 +1,8 @@
 import { bench, describe } from 'vitest'
 
+const BODY_END_TAG = '</body>'
+const MIN_CLOSING_TAG_LENGTH = 4
+
 /**
  * Benchmark comparing different approaches for finding the last closing tag in HTML chunks.
  *
@@ -200,6 +203,303 @@ function findLastClosingTagHybrid(str: string): number {
   return -1
 }
 
+// ============================================================================
+// Body end tag detection variants
+// ============================================================================
+function findBodyEndTagForward(str: string): number {
+  for (let i = 0; i <= str.length - BODY_END_TAG.length; i++) {
+    if (
+      str.charCodeAt(i) === 60 &&
+      str.charCodeAt(i + 1) === 47 &&
+      (str.charCodeAt(i + 2) | 32) === 98 &&
+      (str.charCodeAt(i + 3) | 32) === 111 &&
+      (str.charCodeAt(i + 4) | 32) === 100 &&
+      (str.charCodeAt(i + 5) | 32) === 121 &&
+      str.charCodeAt(i + 6) === 62
+    ) {
+      return i
+    }
+  }
+  return -1
+}
+
+function findBodyEndTagBackward(str: string): number {
+  for (let i = str.length - BODY_END_TAG.length; i >= 0; i--) {
+    if (
+      str.charCodeAt(i) === 60 &&
+      str.charCodeAt(i + 1) === 47 &&
+      (str.charCodeAt(i + 2) | 32) === 98 &&
+      (str.charCodeAt(i + 3) | 32) === 111 &&
+      (str.charCodeAt(i + 4) | 32) === 100 &&
+      (str.charCodeAt(i + 5) | 32) === 121 &&
+      str.charCodeAt(i + 6) === 62
+    ) {
+      return i
+    }
+  }
+  return -1
+}
+
+function findBodyEndTagLastOpenSlash(str: string): number {
+  let searchFrom = str.length - BODY_END_TAG.length
+
+  while (searchFrom >= 0) {
+    const start = str.lastIndexOf('</', searchFrom)
+    if (start === -1) return -1
+
+    if (
+      (str.charCodeAt(start + 2) | 32) === 98 &&
+      (str.charCodeAt(start + 3) | 32) === 111 &&
+      (str.charCodeAt(start + 4) | 32) === 100 &&
+      (str.charCodeAt(start + 5) | 32) === 121 &&
+      str.charCodeAt(start + 6) === 62
+    ) {
+      return start
+    }
+
+    searchFrom = start - 1
+  }
+
+  return -1
+}
+
+function findBodyEndTagNativeLowerThenLastOpenSlash(str: string): number {
+  const index = str.lastIndexOf(BODY_END_TAG)
+  return index === -1 ? findBodyEndTagLastOpenSlash(str) : index
+}
+
+type BoundaryScanResult = {
+  bodyEndIndex: number
+  lastClosingTagEnd: number
+}
+
+function findHtmlBoundaryCombined(str: string): BoundaryScanResult {
+  const len = str.length
+  let lastClosingTagEnd = -1
+  let searchFrom = len - 1
+
+  while (searchFrom >= MIN_CLOSING_TAG_LENGTH - 1) {
+    const closeIndex = str.lastIndexOf('>', searchFrom)
+    if (closeIndex < MIN_CLOSING_TAG_LENGTH - 1) break
+
+    let j = closeIndex - 1
+    while (j >= 1) {
+      const code = str.charCodeAt(j)
+      if (
+        (code >= 97 && code <= 122) ||
+        (code >= 65 && code <= 90) ||
+        (code >= 48 && code <= 57) ||
+        code === 95 ||
+        code === 58 ||
+        code === 46 ||
+        code === 45
+      ) {
+        j--
+      } else {
+        break
+      }
+    }
+
+    const tagNameStart = j + 1
+    if (tagNameStart < closeIndex) {
+      const startCode = str.charCodeAt(tagNameStart)
+      if (
+        ((startCode >= 97 && startCode <= 122) ||
+          (startCode >= 65 && startCode <= 90)) &&
+        j >= 1 &&
+        str.charCodeAt(j) === 47 &&
+        str.charCodeAt(j - 1) === 60
+      ) {
+        if (lastClosingTagEnd === -1) {
+          lastClosingTagEnd = closeIndex + 1
+        }
+
+        if (
+          closeIndex - tagNameStart === 4 &&
+          (str.charCodeAt(tagNameStart) | 32) === 98 &&
+          (str.charCodeAt(tagNameStart + 1) | 32) === 111 &&
+          (str.charCodeAt(tagNameStart + 2) | 32) === 100 &&
+          (str.charCodeAt(tagNameStart + 3) | 32) === 121
+        ) {
+          return { bodyEndIndex: j - 1, lastClosingTagEnd }
+        }
+      }
+    }
+
+    searchFrom = closeIndex - 1
+  }
+
+  return { bodyEndIndex: -1, lastClosingTagEnd }
+}
+
+function findHtmlBoundaryLastOpenSlash(str: string): BoundaryScanResult {
+  let bodyEndIndex = -1
+  let lastClosingTagEnd = -1
+  let searchFrom = str.length - MIN_CLOSING_TAG_LENGTH
+
+  while (searchFrom >= 0) {
+    const openSlash = str.lastIndexOf('</', searchFrom)
+    if (openSlash === -1) break
+
+    let i = openSlash + 2
+    const startCode = str.charCodeAt(i)
+    if (
+      (startCode >= 97 && startCode <= 122) ||
+      (startCode >= 65 && startCode <= 90)
+    ) {
+      i++
+      while (i < str.length) {
+        const code = str.charCodeAt(i)
+        if (
+          (code >= 97 && code <= 122) ||
+          (code >= 65 && code <= 90) ||
+          (code >= 48 && code <= 57) ||
+          code === 95 ||
+          code === 58 ||
+          code === 46 ||
+          code === 45
+        ) {
+          i++
+        } else {
+          break
+        }
+      }
+
+      if (str.charCodeAt(i) === 62) {
+        if (lastClosingTagEnd === -1) {
+          lastClosingTagEnd = i + 1
+        }
+
+        if (
+          i - openSlash === BODY_END_TAG.length - 1 &&
+          (str.charCodeAt(openSlash + 2) | 32) === 98 &&
+          (str.charCodeAt(openSlash + 3) | 32) === 111 &&
+          (str.charCodeAt(openSlash + 4) | 32) === 100 &&
+          (str.charCodeAt(openSlash + 5) | 32) === 121
+        ) {
+          bodyEndIndex = openSlash
+          break
+        }
+      }
+    }
+
+    searchFrom = openSlash - 1
+  }
+
+  return { bodyEndIndex, lastClosingTagEnd }
+}
+
+function findHtmlBoundaryLastOpenSlashLazy(str: string): BoundaryScanResult {
+  let lastClosingTagEnd = -1
+  let searchFrom = str.length - MIN_CLOSING_TAG_LENGTH
+
+  while (searchFrom >= 0) {
+    const openSlash = str.lastIndexOf('</', searchFrom)
+    if (openSlash === -1) break
+
+    if (
+      (str.charCodeAt(openSlash + 2) | 32) === 98 &&
+      (str.charCodeAt(openSlash + 3) | 32) === 111 &&
+      (str.charCodeAt(openSlash + 4) | 32) === 100 &&
+      (str.charCodeAt(openSlash + 5) | 32) === 121 &&
+      str.charCodeAt(openSlash + 6) === 62
+    ) {
+      return { bodyEndIndex: openSlash, lastClosingTagEnd }
+    }
+
+    if (lastClosingTagEnd === -1) {
+      let i = openSlash + 2
+      const startCode = str.charCodeAt(i)
+      if (
+        (startCode >= 97 && startCode <= 122) ||
+        (startCode >= 65 && startCode <= 90)
+      ) {
+        i++
+        while (i < str.length) {
+          const code = str.charCodeAt(i)
+          if (
+            (code >= 97 && code <= 122) ||
+            (code >= 65 && code <= 90) ||
+            (code >= 48 && code <= 57) ||
+            code === 95 ||
+            code === 58 ||
+            code === 46 ||
+            code === 45
+          ) {
+            i++
+          } else {
+            break
+          }
+        }
+
+        if (str.charCodeAt(i) === 62) {
+          lastClosingTagEnd = i + 1
+        }
+      }
+    }
+
+    searchFrom = openSlash - 1
+  }
+
+  return { bodyEndIndex: -1, lastClosingTagEnd }
+}
+
+// Encoded return avoids allocation: body index => -index - 2; otherwise last closing tag end.
+function findHtmlBoundaryLastOpenSlashLazyEncoded(str: string): number {
+  let lastClosingTagEnd = -1
+  let searchFrom = str.length - MIN_CLOSING_TAG_LENGTH
+
+  while (searchFrom >= 0) {
+    const openSlash = str.lastIndexOf('</', searchFrom)
+    if (openSlash === -1) break
+
+    if (
+      (str.charCodeAt(openSlash + 2) | 32) === 98 &&
+      (str.charCodeAt(openSlash + 3) | 32) === 111 &&
+      (str.charCodeAt(openSlash + 4) | 32) === 100 &&
+      (str.charCodeAt(openSlash + 5) | 32) === 121 &&
+      str.charCodeAt(openSlash + 6) === 62
+    ) {
+      return -openSlash - 2
+    }
+
+    if (lastClosingTagEnd === -1) {
+      let i = openSlash + 2
+      const startCode = str.charCodeAt(i)
+      if (
+        (startCode >= 97 && startCode <= 122) ||
+        (startCode >= 65 && startCode <= 90)
+      ) {
+        i++
+        while (i < str.length) {
+          const code = str.charCodeAt(i)
+          if (
+            (code >= 97 && code <= 122) ||
+            (code >= 65 && code <= 90) ||
+            (code >= 48 && code <= 57) ||
+            code === 95 ||
+            code === 58 ||
+            code === 46 ||
+            code === 45
+          ) {
+            i++
+          } else {
+            break
+          }
+        }
+
+        if (str.charCodeAt(i) === 62) {
+          lastClosingTagEnd = i + 1
+        }
+      }
+    }
+
+    searchFrom = openSlash - 1
+  }
+
+  return lastClosingTagEnd
+}
+
 // ============================================================================
 // Test Data Generation
 // ============================================================================
@@ -229,6 +529,23 @@ function generateLargeChunk(): string {
   return html
 }
 
+function generateLargeChunkNoBody(): string {
+  let html = '<div class="app">'
+  for (let i = 0; i < 100; i++) {
+    html += `<div class="item item-${i}"><span class="label">Label ${i}</span><input type="text" value="${i}"/><button>Click</button></div>`
+  }
+  html += '</div>'
+  return html
+}
+
+function generateUppercaseBodyChunk(): string {
+  return generateLargeChunk().replace('</body></html>', '</BODY></HTML>')
+}
+
+function generateLargePlainTextBodyChunk(): string {
+  return '<html><body>' + 'x'.repeat(16 * 1024) + '</body></html>'
+}
+
 // Chunk with custom elements (web components)
 function generateWebComponentChunk(): string {
   let html = '<div class="app">'
@@ -293,8 +610,68 @@ function verifyImplementations() {
   console.log('All implementations verified to produce identical results')
 }
 
+function verifyBodyImplementations() {
+  const testCases = [
+    generateLargeChunk(),
+    generateUppercaseBodyChunk(),
+    generateLargePlainTextBodyChunk(),
+    generateLargeChunkNoBody(),
+    generateNoClosingTagChunk(),
+    generatePartialChunk(),
+    '<html><body>only body</body>',
+    '<html><body>split</bo',
+    '',
+  ]
+
+  for (const testCase of testCases) {
+    const forwardResult = findBodyEndTagForward(testCase)
+    const backwardResult = findBodyEndTagBackward(testCase)
+    const lastOpenSlashResult = findBodyEndTagLastOpenSlash(testCase)
+    const nativeLowerResult =
+      findBodyEndTagNativeLowerThenLastOpenSlash(testCase)
+    const combinedResult = findHtmlBoundaryCombined(testCase)
+    const fusedOpenSlashResult = findHtmlBoundaryLastOpenSlash(testCase)
+    const lazyFusedResult = findHtmlBoundaryLastOpenSlashLazy(testCase)
+    const lazyEncodedResult = findHtmlBoundaryLastOpenSlashLazyEncoded(testCase)
+    const lazyEncodedBodyEndIndex =
+      lazyEncodedResult < -1 ? -lazyEncodedResult - 2 : -1
+    const lazyEncodedLastClosingTagEnd =
+      lazyEncodedResult < -1 ? -1 : lazyEncodedResult
+    const lastClosingTagEnd = findLastClosingTagOptimized(testCase)
+
+    if (
+      forwardResult !== backwardResult ||
+      forwardResult !== lastOpenSlashResult ||
+      forwardResult !== nativeLowerResult ||
+      forwardResult !== combinedResult.bodyEndIndex ||
+      forwardResult !== fusedOpenSlashResult.bodyEndIndex ||
+      forwardResult !== lazyFusedResult.bodyEndIndex ||
+      forwardResult !== lazyEncodedBodyEndIndex ||
+      lastClosingTagEnd !== combinedResult.lastClosingTagEnd ||
+      lastClosingTagEnd !== fusedOpenSlashResult.lastClosingTagEnd ||
+      (forwardResult === -1 &&
+        (lastClosingTagEnd !== lazyFusedResult.lastClosingTagEnd ||
+          lastClosingTagEnd !== lazyEncodedLastClosingTagEnd))
+    ) {
+      console.error('Mismatch for:', testCase.slice(0, 50))
+      console.error('  Forward:', forwardResult)
+      console.error('  Backward:', backwardResult)
+      console.error('  Last </:', lastOpenSlashResult)
+      console.error('  Native lower:', nativeLowerResult)
+      console.error('  Combined:', combinedResult)
+      console.error('  Fused </:', fusedOpenSlashResult)
+      console.error('  Lazy fused </:', lazyFusedResult)
+      console.error('  Lazy encoded </:', lazyEncodedResult)
+      console.error('  Last closing:', lastClosingTagEnd)
+      throw new Error('Body implementation mismatch!')
+    }
+  }
+  console.log('All body implementations verified to produce identical results')
+}
+
 // Run verification before benchmarks
 verifyImplementations()
+verifyBodyImplementations()
 
 // ============================================================================
 // Benchmarks
@@ -439,3 +816,86 @@ describe('Closing Tag Detection - Partial Chunk (streaming edge case)', () => {
     findLastClosingTagHybrid(chunk)
   })
 })
+
+function benchBodyEndTagDetection(name: string, chunk: string) {
+  describe(`Body End Tag Detection - ${name}`, () => {
+    bench('forward charCodeAt', () => {
+      findBodyEndTagForward(chunk)
+    })
+
+    bench('backward charCodeAt', () => {
+      findBodyEndTagBackward(chunk)
+    })
+
+    bench('lastIndexOf(</) candidates', () => {
+      findBodyEndTagLastOpenSlash(chunk)
+    })
+
+    bench('native lowercase + lastIndexOf(</)', () => {
+      findBodyEndTagNativeLowerThenLastOpenSlash(chunk)
+    })
+
+    bench('combined boundary scan', () => {
+      findHtmlBoundaryCombined(chunk).bodyEndIndex
+    })
+  })
+}
+
+function benchBoundaryDetection(name: string, chunk: string) {
+  describe(`HTML Boundary Detection - ${name}`, () => {
+    bench('current two-step forward body + last closing', () => {
+      const bodyEndIndex = findBodyEndTagForward(chunk)
+      if (bodyEndIndex === -1) {
+        findLastClosingTagOptimized(chunk)
+      }
+    })
+
+    bench('lastIndexOf(</) body + last closing', () => {
+      const bodyEndIndex = findBodyEndTagLastOpenSlash(chunk)
+      if (bodyEndIndex === -1) {
+        findLastClosingTagOptimized(chunk)
+      }
+    })
+
+    bench('native lowercase body + last closing', () => {
+      const bodyEndIndex = findBodyEndTagNativeLowerThenLastOpenSlash(chunk)
+      if (bodyEndIndex === -1) {
+        findLastClosingTagOptimized(chunk)
+      }
+    })
+
+    bench('fused lastIndexOf(</) boundary scan', () => {
+      findHtmlBoundaryLastOpenSlash(chunk)
+    })
+
+    bench('lazy fused lastIndexOf(</) boundary scan', () => {
+      findHtmlBoundaryLastOpenSlashLazy(chunk)
+    })
+
+    bench('lazy encoded lastIndexOf(</) boundary scan', () => {
+      findHtmlBoundaryLastOpenSlashLazyEncoded(chunk)
+    })
+
+    bench('combined boundary scan', () => {
+      findHtmlBoundaryCombined(chunk)
+    })
+  })
+}
+
+benchBodyEndTagDetection('Large Final Chunk With </body>', generateLargeChunk())
+benchBodyEndTagDetection('Uppercase </BODY>', generateUppercaseBodyChunk())
+benchBodyEndTagDetection(
+  'Plain Text Body Tail (~16KB)',
+  generateLargePlainTextBodyChunk(),
+)
+benchBodyEndTagDetection(
+  'Large Chunk Without </body>',
+  generateLargeChunkNoBody(),
+)
+
+benchBoundaryDetection('Large Final Chunk With </body>', generateLargeChunk())
+benchBoundaryDetection(
+  'Large Chunk Without </body>',
+  generateLargeChunkNoBody(),
+)
+benchBoundaryDetection('Nested Chunk Without </body>', generateNestedChunk())
diff --git a/packages/router-core/tests/ssr-server-cleanup.test.ts b/packages/router-core/tests/ssr-server-cleanup.test.ts
new file mode 100644
index 0000000000..0cc8832abd
--- /dev/null
+++ b/packages/router-core/tests/ssr-server-cleanup.test.ts
@@ -0,0 +1,380 @@
+import { createMemoryHistory } from '@tanstack/history'
+import { describe, expect, test, vi } from 'vitest'
+import { BaseRootRoute, BaseRoute } from '../src'
+import { createRequestHandler } from '../src/ssr/createRequestHandler'
+import { createSsrStreamResponse } from '../src/ssr/handlerCallback'
+import { attachRouterServerSsrUtils } from '../src/ssr/ssr-server'
+import { transformStreamWithRouter } from '../src/ssr/transformStreamWithRouter'
+import { createTestRouter } from './routerTestUtils'
+
+/**
+ * CI-stable tests for the SSR cleanup contract. These do not rely on GC
+ * timing; they exercise the observable behavior:
+ *   - onCleanup listeners run exactly once
+ *   - cleanup is reentrancy-safe (listener calling cleanup again is a no-op)
+ *   - cleanup is idempotent (second cleanup() call is a no-op)
+ */
+
+function buildRouter(dehydratedData?: Record<string, any>) {
+  const rootRoute = new BaseRootRoute({})
+  const indexRoute = new BaseRoute({
+    getParentRoute: () => rootRoute,
+    path: '/',
+    component: () => null,
+  })
+  return createTestRouter({
+    routeTree: rootRoute.addChildren([indexRoute]),
+    history: createMemoryHistory({ initialEntries: ['/'] }),
+    isServer: true,
+    dehydrate: dehydratedData ? () => dehydratedData : undefined,
+  })
+}
+
+function deferred<T>() {
+  let resolve!: (value: T) => void
+  const promise = new Promise<T>((r) => {
+    resolve = r
+  })
+  return { promise, resolve }
+}
+
+describe('serverSsr.cleanup', () => {
+  test('onCleanup listeners run exactly once', () => {
+    const router = buildRouter()
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    let calls = 0
+    router.serverSsr!.onCleanup(() => {
+      calls++
+    })
+
+    router.serverSsr!.cleanup()
+    // Second call: serverSsr is undefined now, must short-circuit safely.
+    router.serverSsr?.cleanup()
+    expect(calls).toBe(1)
+  })
+
+  test('listener that re-enters cleanup() does not re-fire siblings', () => {
+    const router = buildRouter()
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    const order: Array<string> = []
+    router.serverSsr!.onCleanup(() => {
+      order.push('a')
+      // Reentry: must be a no-op.
+      router.serverSsr?.cleanup()
+    })
+    router.serverSsr!.onCleanup(() => {
+      order.push('b')
+    })
+
+    router.serverSsr!.cleanup()
+    expect(order).toEqual(['a', 'b'])
+  })
+
+  test('listener errors are swallowed and do not stop subsequent listeners', () => {
+    const router = buildRouter()
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    const order: Array<string> = []
+    router.serverSsr!.onCleanup(() => {
+      order.push('a')
+      throw new Error('boom')
+    })
+    router.serverSsr!.onCleanup(() => {
+      order.push('b')
+    })
+
+    // Should not throw.
+    router.serverSsr!.cleanup()
+    expect(order).toEqual(['a', 'b'])
+  })
+
+  test('cleanup before pending serialization resolves drops late scripts safely', async () => {
+    const value = deferred<string>()
+    const router = buildRouter({ value: value.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+    router.serverSsr!.cleanup()
+
+    value.resolve('done')
+    await Promise.resolve()
+    await Promise.resolve()
+
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  test('serialization completion does not clear render-finished listeners', async () => {
+    const value = deferred<string>()
+    const router = buildRouter({ value: value.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    let renderFinishedCalls = 0
+    router.serverSsr!.onRenderFinished(() => {
+      renderFinishedCalls++
+    })
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+
+    value.resolve('done')
+    await serializationDone
+
+    expect(renderFinishedCalls).toBe(0)
+    router.serverSsr!.setRenderFinished()
+    expect(renderFinishedCalls).toBe(1)
+
+    router.serverSsr?.cleanup()
+  })
+
+  test('render-finished listeners can synchronously finish serialization', async () => {
+    const value = deferred<string>()
+    const router = buildRouter({ value: value.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+    router.serverSsr!.takeBufferedScripts()
+
+    router.serverSsr!.onRenderFinished(() => {
+      value.resolve('done')
+    })
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    router.serverSsr!.setRenderFinished()
+    await serializationDone
+
+    expect(router.serverSsr!.takeBufferedHtml()).toContain('$_TSR.e()')
+
+    router.serverSsr?.cleanup()
+  })
+
+  test('late serialization listener runs safely and returns unsubscribe', async () => {
+    const router = buildRouter()
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    let calls = 0
+    const unsubscribe = router.serverSsr!.onSerializationFinished(() => {
+      calls++
+    })
+
+    expect(calls).toBe(1)
+    expect(() => unsubscribe()).not.toThrow()
+    router.serverSsr?.cleanup()
+  })
+
+  test('stream fast path only reserves when no SSR work is pending', async () => {
+    const router = buildRouter()
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+    const barrierScript = router.serverSsr!.takeBufferedScripts()
+    expect(barrierScript).toBeDefined()
+
+    router.serverSsr!.setRenderFinished()
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(true)
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(false)
+
+    router.serverSsr?.cleanup()
+  })
+
+  test('stream fast path rejects while SSR work is pending', async () => {
+    const value = deferred<string>()
+    const router = buildRouter({ value: value.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(false)
+    const barrierScript = router.serverSsr!.takeBufferedScripts()
+    expect(barrierScript).toBeDefined()
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(false)
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    value.resolve('done')
+    await serializationDone
+
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(false)
+    router.serverSsr!.setRenderFinished()
+    expect(router.serverSsr!.reserveStreamFastPath()).toBe(false)
+    expect(router.serverSsr!.takeBufferedHtml()).toContain('<script')
+
+    router.serverSsr?.cleanup()
+  })
+
+  test('throwing injected listener does not skip later listeners', () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const router = buildRouter()
+    try {
+      attachRouterServerSsrUtils({ router, manifest: undefined })
+
+      const calls: Array<string> = []
+      router.serverSsr!.onInjectedHtml(() => {
+        calls.push('a')
+        throw new Error('boom')
+      })
+      router.serverSsr!.onInjectedHtml(() => {
+        calls.push('b')
+      })
+
+      router.serverSsr!.injectHtml('<script>1</script>')
+
+      expect(calls).toEqual(['a', 'b'])
+    } finally {
+      router.serverSsr?.cleanup()
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('server SSR attach lifecycle runs listeners at attach time', () => {
+    const router = buildRouter()
+    const calls: Array<string> = []
+    router.serverSsrLifecycle = {
+      onServerSsrAttach: [
+        (serverSsr) => {
+          calls.push('attach')
+          serverSsr.onCleanup(() => calls.push('cleanup'))
+        },
+      ],
+    }
+
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+    expect(calls).toEqual(['attach'])
+
+    router.serverSsr!.cleanup()
+    expect(calls).toEqual(['attach', 'cleanup'])
+  })
+
+  test('request handler cleans plain response body after drain', async () => {
+    const router = buildRouter()
+    let cleanupCalls = 0
+    const handler = createRequestHandler({
+      createRouter: () => router,
+      request: new Request('http://localhost/'),
+    })
+
+    const response = await handler(({ router: requestRouter }) => {
+      const serverSsr = requestRouter.serverSsr!
+      const cleanup = serverSsr.cleanup
+      serverSsr.cleanup = () => {
+        cleanupCalls++
+        cleanup()
+      }
+      return Promise.resolve(new Response('plain'))
+    })
+
+    expect(cleanupCalls).toBe(1)
+    await response.text()
+    expect(cleanupCalls).toBe(1)
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  test('request handler cleans plain response body on cancel', async () => {
+    const router = buildRouter()
+    let cleanupCalls = 0
+    const handler = createRequestHandler({
+      createRouter: () => router,
+      request: new Request('http://localhost/'),
+    })
+
+    const response = await handler(({ router: requestRouter }) => {
+      const serverSsr = requestRouter.serverSsr!
+      const cleanup = serverSsr.cleanup
+      serverSsr.cleanup = () => {
+        cleanupCalls++
+        cleanup()
+      }
+      return Promise.resolve(
+        new Response(
+          new ReadableStream<Uint8Array>({
+            start(controller) {
+              controller.enqueue(new TextEncoder().encode('plain'))
+            },
+          }),
+        ),
+      )
+    })
+
+    expect(cleanupCalls).toBe(1)
+    await response.body!.cancel('done')
+    expect(cleanupCalls).toBe(1)
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  test('request handler cleans bodyless response immediately', async () => {
+    const router = buildRouter()
+    let cleanupCalls = 0
+    const handler = createRequestHandler({
+      createRouter: () => router,
+      request: new Request('http://localhost/'),
+    })
+
+    await handler(({ router: requestRouter }) => {
+      const serverSsr = requestRouter.serverSsr!
+      const cleanup = serverSsr.cleanup
+      serverSsr.cleanup = () => {
+        cleanupCalls++
+        cleanup()
+      }
+      return Promise.resolve(new Response(null, { status: 204 }))
+    })
+
+    expect(cleanupCalls).toBe(1)
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  test('request handler defers cleanup for stream response metadata', async () => {
+    const router = buildRouter()
+    let cleanupCalls = 0
+    let controller!: ReadableStreamDefaultController<Uint8Array>
+    const handler = createRequestHandler({
+      createRouter: () => router,
+      request: new Request('http://localhost/'),
+    })
+
+    const response = await handler(({ router: requestRouter }) => {
+      const serverSsr = requestRouter.serverSsr!
+      const cleanup = serverSsr.cleanup
+      serverSsr.cleanup = () => {
+        cleanupCalls++
+        cleanup()
+      }
+      const appStream = new ReadableStream<Uint8Array>({
+        start(c) {
+          controller = c
+        },
+      })
+      const responseStream = transformStreamWithRouter(
+        requestRouter,
+        appStream as any,
+      )
+
+      return createSsrStreamResponse(
+        requestRouter,
+        new Response(responseStream as any),
+      )
+    })
+
+    expect(cleanupCalls).toBe(0)
+    controller.enqueue(new TextEncoder().encode('<html><body>ok</body></html>'))
+    controller.close()
+    await response.text()
+    expect(cleanupCalls).toBe(1)
+    expect(router.serverSsr).toBeUndefined()
+  })
+})
diff --git a/packages/router-core/tests/transformStreamBackpressure.perf.test.ts b/packages/router-core/tests/transformStreamBackpressure.perf.test.ts
new file mode 100644
index 0000000000..267241f416
--- /dev/null
+++ b/packages/router-core/tests/transformStreamBackpressure.perf.test.ts
@@ -0,0 +1,290 @@
+// On-demand backpressure test for transformStreamWithRouter.
+//
+// NOT run in CI by default. To execute:
+//   RUN_BACKPRESSURE_PERF=1 pnpm --filter @tanstack/router-core test:unit -- transformStreamBackpressure
+//
+// Validates fix for TanStack/router#7402
+// without a backpressure gate the read loop in
+// transformStreamWithRouter calls controller.enqueue unconditionally,
+// allowing controller.[[queue]] to accumulate Uint8Array chunks (external
+// memory) when the consumer drains slower than the producer.
+import { ReadableStream } from 'node:stream/web'
+import { describe, expect, it } from 'vitest'
+import { transformStreamWithRouter } from '../src/ssr/transformStreamWithRouter'
+
+const enabled = process.env.RUN_BACKPRESSURE_PERF === '1'
+const requiresGc = typeof (globalThis as any).gc === 'function'
+
+function createFastProducer(
+  chunkCount: number,
+  chunkBytes: number,
+  opts: { freshChunks?: boolean } = {},
+) {
+  let pulls = 0
+  let produced = 0
+  const reusable = opts.freshChunks
+    ? null
+    : new Uint8Array(chunkBytes).fill(0x61)
+  const stream = new ReadableStream<Uint8Array>({
+    pull(controller) {
+      pulls++
+      if (produced >= chunkCount) {
+        controller.close()
+        return
+      }
+      produced++
+      // Fresh allocation for external-memory tests: reusing one Uint8Array
+      // means the upstream queue never actually retains additional native
+      // memory even if our transform held arbitrarily many references.
+      controller.enqueue(
+        opts.freshChunks ? new Uint8Array(chunkBytes).fill(0x61) : reusable!,
+      )
+    },
+  })
+  return {
+    stream,
+    getPulls: () => pulls,
+    getProduced: () => produced,
+  }
+}
+
+function makeRouter() {
+  return {
+    serverSsr: {
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      onInjectedHtml: () => () => {},
+      onSerializationFinished: () => () => {},
+      takeBufferedHtml: () => undefined,
+      setRenderFinished: () => {},
+      cleanup: () => {},
+    },
+  } as any
+}
+
+// Main-path router fake: serialization NOT finished synchronously, so the
+// transform runs the full scanner + pending HTML/scripts path. Exposes
+// hooks to inject HTML and signal serialization finished.
+function makeMainPathRouter(): {
+  router: any
+  injectHtml: (html: string) => void
+  finishSerialization: () => void
+} {
+  let buffered = ''
+  const injectedListeners: Array<() => void> = []
+  const serializationListeners: Array<() => void> = []
+  const router: any = {
+    serverSsr: {
+      isSerializationFinished: () => false,
+      reserveStreamFastPath: () => false,
+      onInjectedHtml: (cb: () => void) => {
+        injectedListeners.push(cb)
+        return () => {
+          const i = injectedListeners.indexOf(cb)
+          if (i >= 0) injectedListeners.splice(i, 1)
+        }
+      },
+      onSerializationFinished: (cb: () => void) => {
+        serializationListeners.push(cb)
+        return () => {
+          const i = serializationListeners.indexOf(cb)
+          if (i >= 0) serializationListeners.splice(i, 1)
+        }
+      },
+      takeBufferedHtml: () => {
+        const v = buffered
+        buffered = ''
+        return v || undefined
+      },
+      setRenderFinished: () => {},
+      cleanup: () => {},
+      liftScriptBarrier: () => {},
+    },
+  }
+  return {
+    router,
+    injectHtml: (html) => {
+      buffered += html
+      for (const l of injectedListeners) l()
+    },
+    finishSerialization: () => {
+      for (const l of serializationListeners) l()
+    },
+  }
+}
+
+describe.runIf(enabled)('transformStreamWithRouter backpressure', () => {
+  it('does not run producer arbitrarily ahead of slow consumer', async () => {
+    const CHUNKS = 200
+    const CHUNK_BYTES = 8 * 1024 // 8KB per chunk
+    const producer = createFastProducer(CHUNKS, CHUNK_BYTES)
+    const router = makeRouter()
+
+    const out = transformStreamWithRouter(router, producer.stream)
+
+    const reader = out.getReader()
+    let consumed = 0
+    let maxLead = 0
+    while (true) {
+      // Throttled consumer: ~5ms per chunk.
+      await new Promise((r) => setTimeout(r, 5))
+      const { done } = await reader.read()
+      if (done) break
+      consumed++
+      const lead = producer.getProduced() - consumed
+      if (lead > maxLead) maxLead = lead
+    }
+
+    // Producer should never be more than a small constant number of chunks
+    // ahead of the consumer. ReadableStream default HWM is 1 for byte
+    // streams; allow generous slack for scheduling jitter.
+    expect(maxLead).toBeLessThanOrEqual(8)
+    expect(consumed).toBe(CHUNKS)
+  })
+
+  it('bounded external memory under sustained load', async () => {
+    expect(requiresGc, 'Run with node --expose-gc').toBe(true)
+    const CHUNKS = 1000
+    const CHUNK_BYTES = 16 * 1024
+    const producer = createFastProducer(CHUNKS, CHUNK_BYTES, {
+      freshChunks: true,
+    })
+    const router = makeRouter()
+
+    const out = transformStreamWithRouter(router, producer.stream)
+    const reader = out.getReader()
+
+    let consumed = 0
+    let peakExternal = 0
+    const baseline = process.memoryUsage().external
+    while (true) {
+      await new Promise((r) => setTimeout(r, 2))
+      const { done } = await reader.read()
+      if (done) break
+      consumed++
+      if (consumed % 50 === 0) {
+        ;(globalThis as any).gc()
+        const ext = process.memoryUsage().external - baseline
+        if (ext > peakExternal) peakExternal = ext
+      }
+    }
+
+    // Without backpressure, peak external memory scales w/ CHUNKS*CHUNK_BYTES
+    // (~16MB). With backpressure, only a few chunks worth.
+    expect(peakExternal).toBeLessThan(2 * 1024 * 1024) // 2MB ceiling
+    expect(consumed).toBe(CHUNKS)
+  })
+
+  it('main path: scanner+inject path also honors backpressure', async () => {
+    // Same shape as fast-path test but with a router that forces the
+    // scanner+inject code path. Producer emits valid HTML fragments
+    // (ending at closing tags) so the scanner can release them.
+    const CHUNKS = 200
+    const CHUNK_BYTES = 8 * 1024
+    const filler = 'a'.repeat(CHUNK_BYTES - '<p></p>'.length)
+    const chunkStr = `<p>${filler}</p>`
+    const encoded = new TextEncoder().encode(chunkStr)
+
+    let produced = 0
+    const stream = new ReadableStream<Uint8Array>({
+      pull(controller) {
+        if (produced >= CHUNKS) {
+          controller.close()
+          return
+        }
+        produced++
+        controller.enqueue(encoded)
+      },
+    })
+
+    const { router, finishSerialization } = makeMainPathRouter()
+    const out = transformStreamWithRouter(router, stream)
+    // Mark serialization finished immediately so tryFinish() proceeds once
+    // upstream closes.
+    finishSerialization()
+
+    const reader = out.getReader()
+    let consumed = 0
+    let bytes = 0
+    let maxLead = 0
+    while (true) {
+      await new Promise((r) => setTimeout(r, 5))
+      const { done, value } = await reader.read()
+      if (done) break
+      consumed++
+      bytes += value.byteLength
+      const lead = produced - consumed
+      if (lead > maxLead) maxLead = lead
+    }
+
+    expect(maxLead).toBeLessThanOrEqual(8)
+    expect(consumed).toBe(CHUNKS)
+    expect(bytes).toBe(CHUNKS * encoded.byteLength)
+  })
+
+  it('main path: injected scripts under slow consumer do not balloon memory', async () => {
+    expect(requiresGc, 'Run with node --expose-gc').toBe(true)
+
+    // Producer emits a steady stream of app HTML. While that streams, the
+    // router injects many large <script> chunks. With backpressure these
+    // are stored as strings in pendingWrites and only encoded at enqueue
+    // time, so external memory should stay bounded.
+    const APP_CHUNKS = 200
+    const APP_CHUNK_BYTES = 4 * 1024
+    const INJECT_PER_APP_CHUNK = 5
+    const SCRIPT_BYTES = 4 * 1024
+
+    const appFiller = 'a'.repeat(APP_CHUNK_BYTES - '<p></p>'.length)
+    const appChunkStr = `<p>${appFiller}</p>`
+    const appBytes = new TextEncoder().encode(appChunkStr)
+    const scriptFiller = 's'.repeat(SCRIPT_BYTES - '<script></script>'.length)
+    const scriptStr = `<script>${scriptFiller}</script>`
+
+    const { router, injectHtml, finishSerialization } = makeMainPathRouter()
+
+    let produced = 0
+    const stream = new ReadableStream<Uint8Array>({
+      pull(controller) {
+        if (produced >= APP_CHUNKS) {
+          controller.close()
+          return
+        }
+        produced++
+        // Inject some scripts as part of producing this chunk to simulate
+        // a render that emits HTML AND injects head scripts concurrently.
+        for (let i = 0; i < INJECT_PER_APP_CHUNK; i++) injectHtml(scriptStr)
+        controller.enqueue(appBytes)
+      },
+    })
+
+    const out = transformStreamWithRouter(router, stream)
+    finishSerialization()
+    const reader = out.getReader()
+
+    const baseline = process.memoryUsage().external
+    let peakExternal = 0
+    let consumed = 0
+    let totalText = ''
+    while (true) {
+      await new Promise((r) => setTimeout(r, 2))
+      const { done, value } = await reader.read()
+      if (done) break
+      consumed++
+      totalText += Buffer.from(value).toString('utf8')
+      if (consumed % 25 === 0) {
+        ;(globalThis as any).gc()
+        const ext = process.memoryUsage().external - baseline
+        if (ext > peakExternal) peakExternal = ext
+      }
+    }
+
+    // Total bytes produced ≈ APP_CHUNKS * (APP_CHUNK_BYTES + 5*SCRIPT_BYTES)
+    //                     ≈ 200 * (4KB + 20KB) ≈ 4.8MB
+    // With backpressure peak external should stay well below total.
+    expect(peakExternal).toBeLessThan(2 * 1024 * 1024)
+    expect(totalText.split(appChunkStr).length - 1).toBe(APP_CHUNKS)
+    expect(totalText.split(scriptStr).length - 1).toBe(
+      APP_CHUNKS * INJECT_PER_APP_CHUNK,
+    )
+  })
+})
diff --git a/packages/router-core/tests/transformStreamWithRouter.test.ts b/packages/router-core/tests/transformStreamWithRouter.test.ts
new file mode 100644
index 0000000000..13b0072e24
--- /dev/null
+++ b/packages/router-core/tests/transformStreamWithRouter.test.ts
@@ -0,0 +1,1135 @@
+// CI-stable tests for transformStreamWithRouter behavior.
+//
+// These exercise the deterministic side-effects of the SSR memory fix
+// (TanStack/router#7402) without relying on GC, timing of real I/O, or
+// process.memoryUsage(). On-demand backpressure/external-memory
+// assertions live in transformStreamBackpressure.perf.test.ts.
+import { ReadableStream } from 'node:stream/web'
+import { PassThrough } from 'node:stream'
+import { describe, expect, test, vi } from 'vitest'
+import { createMemoryHistory } from '@tanstack/history'
+import { BaseRootRoute, BaseRoute } from '../src'
+import { GLOBAL_TSR, TSR_SCRIPT_BARRIER_ID } from '../src/ssr/constants'
+import { createSsrStreamResponse } from '../src/ssr/handlerCallback'
+import { attachRouterServerSsrUtils } from '../src/ssr/ssr-server'
+import {
+  transformPipeableStreamWithRouter,
+  transformReadableStreamWithRouter,
+  transformStreamWithRouter,
+} from '../src/ssr/transformStreamWithRouter'
+import { createTestRouter } from './routerTestUtils'
+import type { RouterManagedTag } from '../src/manifest'
+
+const MAX_LEFTOVER_CHARS = 2048
+const MAX_ROUTER_HTML_CHARS = 16 * 1024 * 1024
+
+type FakeServerSsr = {
+  isSerializationFinished: () => boolean
+  reserveStreamFastPath: () => boolean
+  onInjectedHtml: (listener: () => void) => () => void
+  onSerializationFinished: (listener: () => void) => () => void
+  takeBufferedHtml: () => string | undefined
+  setRenderFinished: () => void
+  cleanup: () => void
+  liftScriptBarrier?: () => void
+}
+
+type FakeRouter = {
+  serverSsr?: FakeServerSsr
+}
+
+function makeRouter(opts: Partial<FakeServerSsr> = {}): {
+  router: FakeRouter
+  cleanupCalls: { count: number }
+  injectHtml: (html: string) => void
+  finishSerialization: () => void
+} {
+  const cleanupCalls = { count: 0 }
+  let cleanedUp = false
+  let buffered = ''
+  const injectedListeners: Array<() => void> = []
+  const serializationListeners: Array<() => void> = []
+
+  const router: FakeRouter = {
+    serverSsr: {
+      isSerializationFinished: () => false,
+      reserveStreamFastPath: () => false,
+      onInjectedHtml: (cb) => {
+        injectedListeners.push(cb)
+        return () => {
+          const i = injectedListeners.indexOf(cb)
+          if (i >= 0) injectedListeners.splice(i, 1)
+        }
+      },
+      onSerializationFinished: (cb) => {
+        serializationListeners.push(cb)
+        return () => {
+          const i = serializationListeners.indexOf(cb)
+          if (i >= 0) serializationListeners.splice(i, 1)
+        }
+      },
+      takeBufferedHtml: () => {
+        const v = buffered
+        buffered = ''
+        return v || undefined
+      },
+      setRenderFinished: () => {},
+      cleanup: () => {
+        if (cleanedUp) return
+        cleanedUp = true
+        cleanupCalls.count++
+        router.serverSsr = undefined
+      },
+      liftScriptBarrier: () => {},
+      ...opts,
+    },
+  }
+
+  return {
+    router,
+    cleanupCalls,
+    injectHtml: (html: string) => {
+      buffered += html
+      for (const l of injectedListeners.slice()) {
+        try {
+          l()
+        } catch (err) {
+          console.error('SSR injected HTML listener error:', err)
+        }
+      }
+    },
+    finishSerialization: () => {
+      for (const l of serializationListeners.slice()) {
+        try {
+          l()
+        } catch (err) {
+          console.error('Serialization listener error:', err)
+        }
+      }
+    },
+  }
+}
+
+function makeManualUpstream(): {
+  stream: ReadableStream<Uint8Array>
+  push: (s: string) => void
+  close: () => void
+  cancelled: { value: boolean; reason: unknown }
+} {
+  let controllerRef: ReadableStreamDefaultController<Uint8Array> | undefined
+  const cancelled = { value: false, reason: undefined as unknown }
+  const encoder = new TextEncoder()
+  const stream = new ReadableStream<Uint8Array>({
+    start(c) {
+      controllerRef = c
+    },
+    cancel(reason) {
+      cancelled.value = true
+      cancelled.reason = reason
+    },
+  })
+  return {
+    stream,
+    push: (s) => controllerRef!.enqueue(encoder.encode(s)),
+    close: () => controllerRef!.close(),
+    cancelled,
+  }
+}
+
+async function readAll(s: ReadableStream<Uint8Array>): Promise<string> {
+  const reader = s.getReader()
+  let out = ''
+  while (true) {
+    const { done, value } = await reader.read()
+    if (done) break
+    // Buffer.from accepts any ArrayBufferView regardless of realm (jsdom env).
+    out += Buffer.from(
+      value.buffer,
+      value.byteOffset,
+      value.byteLength,
+    ).toString('utf8')
+  }
+  return out
+}
+
+// Yield to the microtask queue a few times so async stream operations can
+// drain. Avoids reliance on real timers.
+async function flush(n = 5) {
+  for (let i = 0; i < n; i++) await Promise.resolve()
+}
+
+function createDeferred<T>() {
+  let resolve!: (value: T) => void
+  let reject!: (reason?: unknown) => void
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res
+    reject = rej
+  })
+  return { promise, resolve, reject }
+}
+
+function createControlledStream<T>() {
+  let controller!: ReadableStreamDefaultController<T>
+  const stream = new ReadableStream<T>({
+    start(c) {
+      controller = c
+    },
+  })
+  return { stream, controller }
+}
+
+function renderManagedScript(tag: RouterManagedTag) {
+  const attrs = tag.attrs ?? {}
+  const id = attrs.id ? ` id="${attrs.id}"` : ''
+  const className = attrs.className ? ` class="${attrs.className}"` : ''
+  const nonce = attrs.nonce ? ` nonce="${attrs.nonce}"` : ''
+  return `<script${id}${className}${nonce}>${tag.children ?? ''}</script>`
+}
+
+function createRealSsrRouter(dehydratedData: Record<string, any>) {
+  const rootRoute = new BaseRootRoute({})
+  const indexRoute = new BaseRoute({
+    getParentRoute: () => rootRoute,
+    path: '/',
+    component: () => null,
+  })
+
+  return createTestRouter({
+    routeTree: rootRoute.addChildren([indexRoute]),
+    history: createMemoryHistory({ initialEntries: ['/'] }),
+    isServer: true,
+    dehydrate: () => dehydratedData,
+  })
+}
+
+describe('transformStreamWithRouter — real SSR scripts', () => {
+  test('flushes stream-end scripts before body close when serialization finishes before transform starts', async () => {
+    const streamed = createDeferred<string>()
+    const router = createRealSsrRouter({ streamed: streamed.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    const barrierScript = router.serverSsr!.takeBufferedScripts()
+    expect(barrierScript).toBeDefined()
+    expect(barrierScript!.attrs?.id).toBe(TSR_SCRIPT_BARRIER_ID)
+    expect(barrierScript!.children).toContain(`${GLOBAL_TSR}.router=`)
+    expect(barrierScript!.children).not.toContain(`${GLOBAL_TSR}.e()`)
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    streamed.resolve('done')
+    await serializationDone
+
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    upstream.push(
+      `<html><body><main>app</main>${renderManagedScript(
+        barrierScript!,
+      )}</body></html>`,
+    )
+    upstream.close()
+
+    const html = await readAll(output as any)
+
+    expect(html).toContain(`${GLOBAL_TSR}.router=`)
+    expect(html).toContain(`${GLOBAL_TSR}.e()`)
+    expect(html.indexOf(`${GLOBAL_TSR}.e()`)).toBeLessThan(
+      html.indexOf('</body>'),
+    )
+  })
+
+  test('fuses the final resolver and stream-end scripts', async () => {
+    const streamed = createControlledStream<string>()
+    const router = createRealSsrRouter({ streamed: streamed.stream })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    const barrierScript = router.serverSsr!.takeBufferedScripts()
+    expect(barrierScript).toBeDefined()
+
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    upstream.push(
+      `<html><body><main>app</main>${renderManagedScript(
+        barrierScript!,
+      )}</body></html>`,
+    )
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    streamed.controller.close()
+    await serializationDone
+    upstream.close()
+
+    const html = await readAll(output as any)
+    const resolverIndex = html.indexOf('.return(void 0)')
+    const endIndex = html.indexOf(`${GLOBAL_TSR}.e()`)
+
+    expect(resolverIndex).toBeGreaterThan(-1)
+    expect(endIndex).toBeGreaterThan(resolverIndex)
+    expect(html.slice(resolverIndex, endIndex)).not.toContain('</script>')
+    expect(endIndex).toBeLessThan(html.indexOf('</body>'))
+  })
+
+  test('flushes stream-end scripts even when no barrier marker was emitted', async () => {
+    const streamed = createDeferred<string>()
+    const router = createRealSsrRouter({ streamed: streamed.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    streamed.resolve('done')
+    await serializationDone
+
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    upstream.push('<html><body><main>app</main></body></html>')
+    upstream.close()
+
+    const html = await readAll(output as any)
+
+    expect(html).toContain(`${GLOBAL_TSR}.router=`)
+    expect(html).toContain(`${GLOBAL_TSR}.e()`)
+    expect(html.indexOf(`${GLOBAL_TSR}.e()`)).toBeLessThan(
+      html.indexOf('</body>'),
+    )
+  })
+
+  test('keeps stream scripts before uppercase body close', async () => {
+    const streamed = createDeferred<string>()
+    const router = createRealSsrRouter({ streamed: streamed.promise })
+    attachRouterServerSsrUtils({ router, manifest: undefined })
+
+    await router.load()
+    await router.serverSsr!.dehydrate()
+    const barrierScript = router.serverSsr!.takeBufferedScripts()!
+
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    upstream.push(
+      `<html><body>${renderManagedScript(barrierScript)}<main>app</main></BODY></HTML>`,
+    )
+
+    const serializationDone = new Promise<void>((resolve) => {
+      router.serverSsr!.onSerializationFinished(resolve)
+    })
+    streamed.resolve('done')
+    await serializationDone
+    upstream.close()
+
+    const html = await readAll(output as any)
+    expect(html).toContain(`${GLOBAL_TSR}.e()`)
+    expect(html.indexOf(`${GLOBAL_TSR}.e()`)).toBeLessThan(
+      html.indexOf('</BODY>'),
+    )
+  })
+
+  test('detects a barrier marker split across chunks', async () => {
+    let liftCalls = 0
+    const { router, finishSerialization } = makeRouter({
+      liftScriptBarrier: () => {
+        liftCalls++
+      },
+    })
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    const splitAt = Math.floor(TSR_SCRIPT_BARRIER_ID.length / 2)
+
+    upstream.push(
+      `<html><body><script id="${TSR_SCRIPT_BARRIER_ID.slice(0, splitAt)}`,
+    )
+    upstream.push(
+      `${TSR_SCRIPT_BARRIER_ID.slice(splitAt)}"></script><main>app</main>`,
+    )
+    upstream.push('</body></html>')
+    upstream.close()
+    finishSerialization()
+
+    await readAll(output as any)
+    expect(liftCalls).toBe(1)
+  })
+
+  test('does not inject stream scripts inside a split barrier script', async () => {
+    const { router, injectHtml, finishSerialization } = makeRouter({
+      liftScriptBarrier: () => {
+        injectHtml('<script>streamed()</script>')
+      },
+    })
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+
+    upstream.push(
+      `<html><body><main>app</main><script id="${TSR_SCRIPT_BARRIER_ID}`,
+    )
+    upstream.push(`">initial()`)
+    upstream.push('</script><section>after</section>')
+    finishSerialization()
+    upstream.push('</body></html>')
+    upstream.close()
+
+    const html = await readAll(output as any)
+
+    expect(html.indexOf('<script>streamed()</script>')).toBeGreaterThan(
+      html.indexOf('</script><section>after</section>'),
+    )
+    expect(html.indexOf('<script>streamed()</script>')).toBeLessThan(
+      html.indexOf('</body>'),
+    )
+  })
+
+  test('remembers a flushed barrier marker until a later closing-tag boundary', async () => {
+    let liftCalls = 0
+    const { router, finishSerialization } = makeRouter({
+      liftScriptBarrier: () => {
+        liftCalls++
+      },
+    })
+    const upstream = makeManualUpstream()
+    const output = transformStreamWithRouter(
+      router as any,
+      upstream.stream as any,
+    )
+    const filler = 'x'.repeat(MAX_LEFTOVER_CHARS + 32)
+
+    upstream.push(
+      `<html><body><main>app</main><script id="${TSR_SCRIPT_BARRIER_ID}${filler}`,
+    )
+    await flush()
+    expect(liftCalls).toBe(0)
+
+    upstream.push('initial()</script><section>after</section>')
+    upstream.push('</body></html>')
+    upstream.close()
+    finishSerialization()
+
+    await readAll(output as any)
+    expect(liftCalls).toBe(1)
+  })
+})
+
+describe('transformStreamWithRouter — cleanup side-effects', () => {
+  test('downstream cancel propagates upstream and calls serverSsr.cleanup once', async () => {
+    // Fast path: simpler, no scanner. Verifies cancel + cleanup contract.
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => undefined,
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    const reader = (
+      out as any
+    ).getReader() as ReadableStreamDefaultReader<Uint8Array>
+
+    // Cancel before any data flows. Should still trigger upstream cancel
+    // and exactly one cleanup invocation.
+    await reader.cancel('consumer-gone')
+    await flush()
+
+    expect(upstream.cancelled.value).toBe(true)
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('downstream cancel waits for upstream cancellation to settle', async () => {
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => undefined,
+    })
+
+    let resolveCancel!: () => void
+    const upstream = new ReadableStream<Uint8Array>({
+      pull() {
+        // Keep the transform's upstream read pending until cancellation.
+      },
+      cancel() {
+        return new Promise<void>((resolve) => {
+          resolveCancel = resolve
+        })
+      },
+    })
+
+    const out = transformStreamWithRouter(router as any, upstream as any)
+    const reader = (
+      out as any
+    ).getReader() as ReadableStreamDefaultReader<Uint8Array>
+
+    let cancelSettled = false
+    const cancelPromise = reader.cancel('consumer-gone').then(() => {
+      cancelSettled = true
+    })
+
+    await flush()
+    expect(cancelSettled).toBe(false)
+    expect(cleanupCalls.count).toBe(1)
+
+    resolveCancel()
+    await cancelPromise
+    expect(cancelSettled).toBe(true)
+  })
+
+  test('natural close calls cleanup exactly once', async () => {
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => undefined,
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+
+    upstream.push('<html><body>done</body></html>')
+    upstream.close()
+
+    const text = await readAll(out as any)
+    expect(text).toContain('done')
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('stream response metadata defers cleanup until body drains', async () => {
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => undefined,
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    const response = new Response(out as any)
+    const result = createSsrStreamResponse(router as any, response)
+
+    expect(result.serverSsrCleanup).toBe('stream')
+    expect(cleanupCalls.count).toBe(0)
+
+    upstream.push('<html><body>done</body></html>')
+    upstream.close()
+
+    await result.response.text()
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('stream response dispose cancels body and cleans once', async () => {
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => undefined,
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    const result = createSsrStreamResponse(
+      router as any,
+      new Response(out as any),
+    )
+    expect(result.serverSsrCleanup).toBe('stream')
+    if (result.serverSsrCleanup !== 'stream') return
+
+    await result.dispose('dropped')
+    await result.dispose('dropped-again')
+
+    expect(upstream.cancelled.value).toBe(true)
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('SSR fast path is used when explicitly safe', async () => {
+    let takeBufferedHtmlCalls = 0
+    let setRenderFinishedCalls = 0
+    const { router, cleanupCalls } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => true,
+      takeBufferedHtml: () => {
+        takeBufferedHtmlCalls++
+        return undefined
+      },
+      setRenderFinished: () => {
+        setRenderFinishedCalls++
+      },
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    upstream.push('<html><body>done</body></html>')
+    upstream.close()
+
+    const text = await readAll(out as any)
+    expect(text).toBe('<html><body>done</body></html>')
+    expect(takeBufferedHtmlCalls).toBe(0)
+    expect(setRenderFinishedCalls).toBe(1)
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('SSR fast path is bypassed when not explicitly safe', async () => {
+    let takeBufferedHtmlCalls = 0
+    let pendingHtml: string | undefined = '<script>pending()</script>'
+    const { router, injectHtml, finishSerialization } = makeRouter({
+      isSerializationFinished: () => true,
+      reserveStreamFastPath: () => false,
+      takeBufferedHtml: () => {
+        takeBufferedHtmlCalls++
+        const html = pendingHtml
+        pendingHtml = undefined
+        return html
+      },
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    upstream.push('<html><body>done</body></html>')
+    upstream.close()
+    finishSerialization()
+
+    const text = await readAll(out as any)
+    expect(text).toContain('<script>pending()</script>')
+    expect(text.indexOf('<script>pending()</script>')).toBeLessThan(
+      text.indexOf('</body>'),
+    )
+    expect(takeBufferedHtmlCalls).toBeGreaterThan(0)
+  })
+
+  test('SSR fast path errors on unexpected late injection', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { router, injectHtml, cleanupCalls } = makeRouter({
+        isSerializationFinished: () => true,
+        reserveStreamFastPath: () => true,
+      })
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+      )
+      injectHtml('<script>late()</script>')
+
+      await expect(readAll(out as any)).rejects.toThrow(
+        'SSR router HTML injected during fast path',
+      )
+      expect(cleanupCalls.count).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('lifetime timeout cancels upstream and runs cleanup once', async () => {
+    vi.useFakeTimers()
+    try {
+      const { router, cleanupCalls } = makeRouter({
+        isSerializationFinished: () => true,
+        takeBufferedHtml: () => undefined,
+      })
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+        { lifetimeMs: 10 },
+      )
+
+      // Do NOT consume. Advance fake time past lifetimeMs deterministically.
+      await vi.advanceTimersByTimeAsync(15)
+
+      expect(upstream.cancelled.value).toBe(true)
+      expect(cleanupCalls.count).toBe(1)
+
+      // Drain (read errors silently) so vitest doesn't see an unhandled error.
+      const reader = (
+        out as any
+      ).getReader() as ReadableStreamDefaultReader<Uint8Array>
+      reader.read().catch(() => {})
+      reader.releaseLock()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  test('upstream cancel() that rejects does not produce an unhandled rejection', async () => {
+    // Some upstream sources may reject when cancel() is called (e.g. their
+    // own underlying source.cancel throws). safeCancelReader must swallow.
+    const unhandled: Array<unknown> = []
+    const onUnhandled = (e: PromiseRejectionEvent | any) => {
+      unhandled.push(e?.reason ?? e)
+    }
+    process.on('unhandledRejection', onUnhandled)
+    try {
+      const { router, cleanupCalls } = makeRouter({
+        isSerializationFinished: () => true,
+        takeBufferedHtml: () => undefined,
+      })
+
+      const stream = new ReadableStream<Uint8Array>({
+        start() {},
+        cancel() {
+          // Simulate a misbehaving upstream whose cancel rejects.
+          throw new Error('boom-cancel')
+        },
+      })
+
+      const out = transformStreamWithRouter(router as any, stream as any)
+      const reader = (
+        out as any
+      ).getReader() as ReadableStreamDefaultReader<Uint8Array>
+
+      // Consumer goes away → triggers cancelUpstream → upstream cancel throws.
+      await reader.cancel('consumer-gone').catch(() => {})
+      // Allow microtasks for any rejection to surface.
+      await flush(10)
+
+      expect(cleanupCalls.count).toBe(1)
+      expect(
+        unhandled.find(
+          (e: any) => e && String(e.message || e).includes('boom-cancel'),
+        ),
+      ).toBeUndefined()
+    } finally {
+      process.off('unhandledRejection', onUnhandled)
+    }
+  })
+
+  test('server cleanup throwing does not prevent terminal stream cleanup', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { router, finishSerialization } = makeRouter({
+        cleanup: () => {
+          throw new Error('cleanup-boom')
+        },
+      })
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+      )
+      upstream.push('<html><body>done</body></html>')
+      upstream.close()
+      finishSerialization()
+
+      await expect(readAll(out as any)).resolves.toContain('done')
+      expect(errorSpy).toHaveBeenCalled()
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('throwing injected listener does not skip transform drain', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { router, injectHtml, finishSerialization } = makeRouter()
+      router.serverSsr!.onInjectedHtml(() => {
+        throw new Error('external-listener-boom')
+      })
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+      )
+
+      upstream.push('<html><body><main>app</main>')
+      injectHtml('<script>drained()</script>')
+      upstream.push('</body></html>')
+      upstream.close()
+      finishSerialization()
+
+      const text = await readAll(out as any)
+      expect(text).toContain('<script>drained()</script>')
+      expect(text.indexOf('<script>drained()</script>')).toBeLessThan(
+        text.indexOf('</body>'),
+      )
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('tail overflow errors and runs cleanup', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { router, cleanupCalls, finishSerialization } = makeRouter()
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+      )
+      upstream.push(`<html><body>done</body>${'x'.repeat(64 * 1024 + 1)}`)
+      upstream.close()
+      finishSerialization()
+
+      await expect(readAll(out as any)).rejects.toThrow(
+        'SSR stream tail exceeded maximum buffer',
+      )
+      expect(cleanupCalls.count).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('router HTML overflow errors and runs cleanup', async () => {
+    const { router, injectHtml, cleanupCalls } = makeRouter()
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    injectHtml('x'.repeat(MAX_ROUTER_HTML_CHARS + 1))
+
+    await expect(readAll(out as any)).rejects.toThrow(
+      'SSR router HTML exceeded maximum buffer',
+    )
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('pending output overflow errors and runs cleanup', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const { router, cleanupCalls, finishSerialization } = makeRouter()
+      const upstream = makeManualUpstream()
+
+      const out = transformStreamWithRouter(
+        router as any,
+        upstream.stream as any,
+      )
+      upstream.push(`${'x'.repeat(16 * 1024 * 1024 + 1)}</div>`)
+      upstream.close()
+      finishSerialization()
+
+      await expect(readAll(out as any)).rejects.toThrow(
+        'SSR stream pending output exceeded maximum buffer',
+      )
+      expect(cleanupCalls.count).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+
+  test('long text without closing tags partially flushes and keeps bounded leftover', async () => {
+    const { router, finishSerialization } = makeRouter()
+    const upstream = makeManualUpstream()
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+    const reader = (out as any).getReader()
+    const text = 'x'.repeat(MAX_LEFTOVER_CHARS + 32)
+
+    upstream.push(text)
+
+    const first = await reader.read()
+    expect(first.done).toBe(false)
+    const firstText = Buffer.from(first.value).toString('utf8')
+    expect(firstText).toBe('x'.repeat(32))
+
+    upstream.close()
+    finishSerialization()
+
+    let rest = ''
+    for (;;) {
+      const { done, value } = await reader.read()
+      if (done) break
+      rest += Buffer.from(value).toString('utf8')
+    }
+
+    expect(firstText + rest).toBe(text)
+  })
+
+  test('takeBufferedHtml throwing errors stream and runs cleanup once', async () => {
+    const { router, cleanupCalls } = makeRouter({
+      takeBufferedHtml: () => {
+        throw new Error('take-buffered-html-boom')
+      },
+    })
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+
+    await expect(readAll(out as any)).rejects.toThrow('take-buffered-html-boom')
+    expect(cleanupCalls.count).toBe(1)
+  })
+
+  test('downstream backpressure delays close; no chunks are lost', async () => {
+    // Consumer reads slowly: we verify all router-injected scripts AND the
+    // tail closing tags arrive before the stream ends, even though
+    // tryFinish() requests close while writes are still queued.
+    const { router, injectHtml, finishSerialization } = makeRouter()
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+
+    upstream.push('<html><body><div>a</div>')
+    // Queue many injected chunks while app is still rendering.
+    for (let i = 0; i < 50; i++) injectHtml(`<script>S${i}</script>`)
+    upstream.push('</body></html>')
+    upstream.close()
+    finishSerialization()
+
+    const full = await readAll(out as any)
+
+    expect(full).toContain('<div>a</div>')
+    expect(full).toContain('</body></html>')
+    for (let i = 0; i < 50; i++) {
+      expect(full).toContain(`<script>S${i}</script>`)
+    }
+    // All scripts must appear before </body>.
+    expect(full.indexOf('<script>S49</script>')).toBeLessThan(
+      full.indexOf('</body>'),
+    )
+  })
+})
+
+describe('transformStreamWithRouter — injected HTML ordering', () => {
+  test('router-injected HTML interleaves at scanner safe points, not mid-tag', async () => {
+    const { router, injectHtml, finishSerialization } = makeRouter()
+    const upstream = makeManualUpstream()
+
+    const out = transformStreamWithRouter(router as any, upstream.stream as any)
+
+    // App emits a chunk ending in a complete closing tag so the scanner
+    // can release content + flush pending router HTML at a safe boundary.
+    upstream.push('<html><body><div>app</div>')
+    // Injected during render — must be buffered, not enqueued ahead of
+    // pending app content, and not split across closing tags.
+    injectHtml('<script>X</script>')
+    injectHtml('<script>Y</script>')
+
+    // Tail chunk: end of body. Triggers pendingClosingTags capture and
+    // flushPendingRouterHtml before the tail is emitted on tryFinish.
+    upstream.push('</body></html>')
+    upstream.close()
+    finishSerialization()
+
+    const full = await readAll(out as any)
+
+    // Order: app div → scripts → body close.
+    expect(full).toContain('<div>app</div>')
+    expect(full).toContain('<script>X</script>')
+    expect(full).toContain('<script>Y</script>')
+    expect(full.indexOf('<div>app</div>')).toBeLessThan(
+      full.indexOf('<script>X</script>'),
+    )
+    expect(full.indexOf('<script>Y</script>')).toBeLessThan(
+      full.indexOf('</body>'),
+    )
+  })
+
+  test('onAbort: fires once when downstream cancels (readable wrapper)', async () => {
+    const { router, finishSerialization } = makeRouter()
+    finishSerialization()
+
+    let produced = 0
+    const upstream = new ReadableStream<Uint8Array>({
+      pull(controller) {
+        produced++
+        controller.enqueue(new TextEncoder().encode('<p>x</p>'))
+      },
+    })
+
+    let aborts = 0
+    const out = transformReadableStreamWithRouter(
+      router as any,
+      upstream as any,
+      { onAbort: () => aborts++ },
+    )
+
+    const reader = (out as any).getReader()
+    await reader.read()
+    await reader.cancel(new Error('client disconnect'))
+    // Allow microtasks to flush.
+    await Promise.resolve()
+    await Promise.resolve()
+
+    expect(aborts).toBe(1)
+    expect(produced).toBeGreaterThan(0)
+  })
+
+  test('onAbort: NOT called on natural successful completion', async () => {
+    const { router, finishSerialization } = makeRouter()
+
+    const upstream = new ReadableStream<Uint8Array>({
+      start(controller) {
+        controller.enqueue(new TextEncoder().encode('<p>done</p>'))
+        controller.close()
+      },
+    })
+
+    let aborts = 0
+    const out = transformReadableStreamWithRouter(
+      router as any,
+      upstream as any,
+      { onAbort: () => aborts++ },
+    )
+
+    // tryFinish gates on serialization-finished; signal it AFTER transform
+    // has subscribed to the event.
+    finishSerialization()
+
+    // Drain to completion.
+    const reader = (out as any).getReader()
+    while (true) {
+      const { done } = await reader.read()
+      if (done) break
+    }
+
+    expect(aborts).toBe(0)
+  })
+
+  test('onAbort: fires when pipeable wrapper consumer destroys', async () => {
+    const { router, finishSerialization } = makeRouter()
+    finishSerialization()
+
+    const pass = new PassThrough()
+    let aborts = 0
+    const out = transformPipeableStreamWithRouter(router as any, pass, {
+      onAbort: () => aborts++,
+    })
+    // Swallow expected error emission from destroy().
+    out.on('error', () => {})
+
+    // Push something so the read loop is engaged.
+    pass.write('<p>x</p>')
+    // Wait a tick to let reader start.
+    await new Promise((r) => setImmediate(r))
+
+    // Destroy downstream — simulates Node response being closed by client.
+    out.destroy(new Error('client gone'))
+    // Allow microtasks + readable webstream cancel propagation.
+    await new Promise((r) => setImmediate(r))
+    await Promise.resolve()
+
+    expect(aborts).toBe(1)
+
+    // Cleanup: destroy upstream so we don't leak.
+    if (!pass.destroyed) pass.destroy()
+  })
+
+  test('onAbort: lifetime timeout triggers abort exactly once', async () => {
+    vi.useFakeTimers()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})
+    try {
+      const { router, finishSerialization } = makeRouter()
+      finishSerialization()
+
+      // Upstream that never produces or closes.
+      const upstream = new ReadableStream<Uint8Array>({
+        pull() {
+          // never enqueue, never close
+        },
+      })
+
+      let aborts = 0
+
+      const out = transformReadableStreamWithRouter(
+        router as any,
+        upstream as any,
+        { onAbort: () => aborts++, lifetimeMs: 1000 },
+      )
+
+      // Start reading (which may reject when stream is errored)
+      const reader = (out as any).getReader()
+      const readP = reader.read().catch(() => undefined)
+
+      await vi.advanceTimersByTimeAsync(1500)
+      await readP
+
+      expect(aborts).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+      warnSpy.mockRestore()
+      vi.useRealTimers()
+    }
+  })
+
+  test('default lifetime is derived from timeoutMs', async () => {
+    vi.useFakeTimers()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})
+    try {
+      const { router, finishSerialization } = makeRouter()
+      finishSerialization()
+      const upstream = new ReadableStream<Uint8Array>({
+        pull() {
+          // never enqueue, never close
+        },
+      })
+
+      let aborts = 0
+      const out = transformReadableStreamWithRouter(
+        router as any,
+        upstream as any,
+        { onAbort: () => aborts++, timeoutMs: 10 },
+      )
+
+      const reader = (out as any).getReader()
+      const readP = reader.read().catch(() => undefined)
+
+      await vi.advanceTimersByTimeAsync(15)
+      expect(aborts).toBe(0)
+
+      await vi.advanceTimersByTimeAsync(6)
+      await readP
+      expect(aborts).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+      warnSpy.mockRestore()
+      vi.useRealTimers()
+    }
+  })
+
+  test('upstream writable abort surfaces; readable does not hang', async () => {
+    const { router, finishSerialization } = makeRouter()
+    finishSerialization()
+
+    // Simulate the Vue sync-setup-throw recovery path: a TransformStream is
+    // handed to the router transform, and the producer never writes before
+    // aborting the writable side. The router transform's readable must
+    // resolve (with done or an error) rather than wait for lifetimeMs.
+    const ts = new TransformStream()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      let aborts = 0
+      const out = transformReadableStreamWithRouter(
+        router as any,
+        ts.readable as any,
+        { onAbort: () => aborts++ },
+      )
+
+      void ts.writable.abort(new Error('setup-throw')).catch(() => {})
+
+      const reader = (out as any).getReader()
+      // Either the read resolves with done, or it rejects with the abort
+      // reason. Both prove non-hang behavior; we just require it terminates.
+      const terminated = await reader
+        .read()
+        .then(() => true)
+        .catch(() => true)
+
+      expect(terminated).toBe(true)
+      expect(aborts).toBe(1)
+    } finally {
+      errorSpy.mockRestore()
+    }
+  })
+})
diff --git a/packages/router-core/vite.config.ts b/packages/router-core/vite.config.ts
index 413c56c404..97859dda97 100644
--- a/packages/router-core/vite.config.ts
+++ b/packages/router-core/vite.config.ts
@@ -20,6 +20,12 @@ const config = defineConfig({
     watch: false,
     environment: 'jsdom',
     typecheck: { enabled: true },
+    // Perf tests are gated by env var and excluded from default runs.
+    // To run: RUN_BACKPRESSURE_PERF=1 pnpm vitest run transformStreamBackpressure
+    exclude:
+      process.env.RUN_BACKPRESSURE_PERF === '1'
+        ? ['**/node_modules/**']
+        : ['**/*.perf.test.ts', '**/node_modules/**'],
     alias: {
       // For tests only, resolve to development.ts which returns undefined
       // so that router.isServer fallback is used
diff --git a/packages/router-ssr-query-core/package.json b/packages/router-ssr-query-core/package.json
index 7aa993d54e..61aff2e40c 100644
--- a/packages/router-ssr-query-core/package.json
+++ b/packages/router-ssr-query-core/package.json
@@ -33,7 +33,7 @@
     "test:types:ts58": "node ../../node_modules/typescript58/lib/tsc.js",
     "test:types:ts59": "node ../../node_modules/typescript59/lib/tsc.js",
     "test:types:ts60": "tsc",
-    "test:unit": "exit 0; vitest",
+    "test:unit": "vitest",
     "test:unit:dev": "pnpm run test:unit --watch",
     "test:build": "publint --strict && attw --ignore-rules no-resolution --pack .",
     "build": "vite build"
diff --git a/packages/router-ssr-query-core/src/index.ts b/packages/router-ssr-query-core/src/index.ts
index 188dbf13a8..685653dea0 100644
--- a/packages/router-ssr-query-core/src/index.ts
+++ b/packages/router-ssr-query-core/src/index.ts
@@ -46,10 +46,61 @@ export function setupCoreRouterSsrQueryIntegration<TRouter extends AnyRouter>({
     const sentQueries = new Set<string>()
     const queryStream = createPushableStream()
     let unsubscribe: (() => void) | undefined = undefined
+    let cleanupRegistered = false
+    let tornDown = false
+
+    const teardown = () => {
+      if (tornDown) return
+      tornDown = true
+      try {
+        unsubscribe?.()
+      } catch {
+        // ignore
+      }
+      unsubscribe = undefined
+      try {
+        if (!queryStream.isClosed()) queryStream.close()
+      } catch {
+        // ignore
+      }
+      // Cancel any in-flight queries and clear the cache. Removing queries
+      // cancels their gcTime setTimeout handles which would otherwise pin
+      // the queryClient (and transitively the router via router.context)
+      // alive for the full gcTime window (default 5min) per SSR request.
+      try {
+        queryClient.cancelQueries()
+      } catch {
+        // ignore
+      }
+      try {
+        queryClient.clear()
+      } catch {
+        // ignore
+      }
+      sentQueries.clear()
+    }
+
+    // Register teardown as soon as SSR attaches. attachRouterServerSsrUtils()
+    // runs before router.load(), so this covers redirects/errors thrown before
+    // router.options.dehydrate() can run.
+    const registerCleanup = (serverSsr = router.serverSsr) => {
+      if (cleanupRegistered) return
+      if (!serverSsr) return
+      serverSsr.onCleanup(teardown)
+      cleanupRegistered = true
+    }
+    router.serverSsrLifecycle = {
+      ...router.serverSsrLifecycle,
+      onServerSsrAttach: [
+        ...(router.serverSsrLifecycle?.onServerSsrAttach ?? []),
+        registerCleanup,
+      ],
+    }
+
     router.options.dehydrate =
       async (): Promise<DehydratedRouterQueryState> => {
         router.serverSsr!.onRenderFinished(() => {
-          queryStream.close()
+          if (!queryStream.isClosed()) queryStream.close()
           unsubscribe?.()
           unsubscribe = undefined
         })
@@ -204,12 +255,19 @@ function createPushableStream(): PushableStream {
 
   return {
     stream,
-    enqueue: (chunk) => controllerRef.enqueue(chunk),
+    enqueue: (chunk) => {
+      if (!_isClosed) controllerRef.enqueue(chunk)
+    },
     close: () => {
+      if (_isClosed) return
       controllerRef.close()
       _isClosed = true
     },
     isClosed: () => _isClosed,
-    error: (err: unknown) => controllerRef.error(err),
+    error: (err: unknown) => {
+      if (_isClosed) return
+      _isClosed = true
+      controllerRef.error(err)
+    },
   }
 }
diff --git a/packages/router-ssr-query-core/tests/index.test.ts b/packages/router-ssr-query-core/tests/index.test.ts
index 93be3590ab..a167dbd03e 100644
--- a/packages/router-ssr-query-core/tests/index.test.ts
+++ b/packages/router-ssr-query-core/tests/index.test.ts
@@ -11,35 +11,65 @@ type TestRouter = {
   serverSsr?: {
     isDehydrated: () => boolean
     onRenderFinished: (listener: () => void) => void
+    onCleanup: (listener: () => void) => void
+  }
+  serverSsrLifecycle?: {
+    onServerSsrAttach: Array<
+      (serverSsr: NonNullable<TestRouter['serverSsr']>) => void
+    >
   }
 }
 
-function createServerRouter(): {
+type ServerRouterFixture = {
   router: TestRouter
   finishRender: () => void
+  triggerCleanup: () => void
+  attachServerSsr: () => void
   setDehydrated: (value: boolean) => void
-} {
+  cleanupListenerCount: () => number
+}
+
+function createServerRouter(): ServerRouterFixture {
   const renderFinishedListeners = new Array<() => void>()
+  const cleanupListeners = new Array<() => void>()
   let dehydrated = false
+  const serverSsr = {
+    isDehydrated: () => dehydrated,
+    onRenderFinished: (listener: () => void) => {
+      renderFinishedListeners.push(listener)
+    },
+    onCleanup: (listener: () => void) => {
+      cleanupListeners.push(listener)
+    },
+  }
 
-  return {
+  const result: ServerRouterFixture = {
     router: {
       isServer: true,
       options: {},
-      serverSsr: {
-        isDehydrated: () => dehydrated,
-        onRenderFinished: (listener) => {
-          renderFinishedListeners.push(listener)
-        },
-      },
+      serverSsr,
     },
     finishRender: () => {
       renderFinishedListeners.splice(0).forEach((listener) => listener())
     },
-    setDehydrated: (value) => {
+    triggerCleanup: () => {
+      cleanupListeners.splice(0).forEach((listener) => listener())
+    },
+    attachServerSsr: () => {
+      result.router.serverSsr = serverSsr
+      result.router.serverSsrLifecycle?.onServerSsrAttach.forEach(
+        (listener) => {
+          listener(serverSsr)
+        },
+      )
+    },
+    setDehydrated: (value: boolean) => {
       dehydrated = value
     },
+    cleanupListenerCount: () => cleanupListeners.length,
   }
+
+  return result
 }
 
 async function readStream<T>(stream: ReadableStream<T>): Promise<Array<T>> {
@@ -86,15 +116,40 @@ function createDehydratedQueryState(data: string) {
   }
 }
 
+// Track QueryClients per-test and clear them in afterEach. Without this,
+// queries created in tests keep their gcTime setTimeout handles open (5min
+// default in jsdom), pinning QueryClient + QueryCache + this test's router
+// alive across the whole suite. cancelQueries() + clear() drops them.
+const trackedQueryClients = new Set<QueryClient>()
+function track<T extends QueryClient>(client: T): T {
+  trackedQueryClients.add(client)
+  return client
+}
+
 afterEach(() => {
   vi.clearAllMocks()
+  for (const client of trackedQueryClients) {
+    try {
+      client.cancelQueries()
+    } catch {
+      // ignore
+    }
+    try {
+      client.clear()
+    } catch {
+      // ignore
+    }
+  }
+  trackedQueryClients.clear()
 })
 
 describe('setupCoreRouterSsrQueryIntegration', () => {
   it('uses custom dehydrate options for the initial payload and streamed queries', async () => {
-    const queryClient = new QueryClient()
-    const { router, finishRender, setDehydrated } = createServerRouter()
+    const queryClient = track(new QueryClient())
+    const { router, finishRender, attachServerSsr, setDehydrated } =
+      createServerRouter()
 
+    router.serverSsr = undefined
     setupCoreRouterSsrQueryIntegration({
       router: router as any,
       queryClient,
@@ -103,6 +158,7 @@ describe('setupCoreRouterSsrQueryIntegration', () => {
         shouldDehydrateQuery: (query) => query.queryKey[0] !== 'skip',
       },
     })
+    attachServerSsr()
 
     queryClient.setQueryData(['include'], 'initial')
     queryClient.setQueryData(['skip'], 'ignored')
@@ -153,7 +209,7 @@ describe('setupCoreRouterSsrQueryIntegration', () => {
   })
 
   it('uses custom hydrate options for the initial payload and streamed queries', async () => {
-    const queryClient = new QueryClient()
+    const queryClient = track(new QueryClient())
     const router: TestRouter = {
       isServer: false,
       options: {},
@@ -206,3 +262,255 @@ describe('setupCoreRouterSsrQueryIntegration', () => {
     expect(queryClient.getQueryData(['streamed'])).toBe('stream-hydrated')
   })
 })
+
+// GC reclamation tests are non-deterministic by nature (V8 makes no
+// guarantee about WeakRef collection timing). Run them on demand only:
+//   RUN_SSR_GC_TESTS=1 pnpm vitest
+// The vite config gates --expose-gc on the same env var; outside of that
+// gc() is unavailable and the describe is skipped.
+const gcAvailable = typeof (globalThis as any).gc === 'function'
+const gcTestsEnabled = process.env.RUN_SSR_GC_TESTS === '1' && gcAvailable
+
+async function forceGc() {
+  // Multiple passes; V8 may need several GC cycles to collect WeakRef
+  // targets, especially with closure chains.
+  for (let i = 0; i < 6; i++) {
+    ;(globalThis as any).gc()
+    await new Promise((r) => setTimeout(r, 0))
+  }
+}
+
+// Reproduces TanStack/router#7402: per-request Router + QueryClient must be
+// reclaimable by GC after SSR cleanup. Without the onCleanup teardown, the
+// queryCache subscriber closure + gcTime setTimeout handles pin the
+// QueryClient (and transitively the Router via router.context) for the full
+// gcTime window (default 5min) per request.
+describe.runIf(gcTestsEnabled)('SSR memory: GC reclamation', () => {
+  it('queryClient + router are reclaimable after cleanup', async () => {
+    let queryClient: QueryClient | null = new QueryClient({
+      defaultOptions: { queries: { gcTime: 5 * 60 * 1000 } },
+    })
+    let serverRouter: ReturnType<typeof createServerRouter> | null =
+      createServerRouter()
+
+    serverRouter.router.serverSsr = undefined
+    setupCoreRouterSsrQueryIntegration({
+      router: serverRouter.router as any,
+      queryClient,
+    })
+    serverRouter.attachServerSsr()
+
+    // Populate cache w/ active gcTime timers (the leak anchor).
+    queryClient.setQueryData(['a'], 'data-a')
+    queryClient.setQueryData(['b'], 'data-b')
+
+    // Run a full SSR cycle: dehydrate (registers onCleanup) -> finishRender.
+    await serverRouter.router.options.dehydrate?.()
+    serverRouter.setDehydrated(true)
+    serverRouter.finishRender()
+
+    const qcRef = new WeakRef(queryClient)
+    const routerRef = new WeakRef(serverRouter.router)
+    const cacheRef = new WeakRef(queryClient.getQueryCache())
+
+    // Simulate full request teardown.
+    serverRouter.triggerCleanup()
+
+    // Drop all strong refs.
+    queryClient = null
+    serverRouter = null
+
+    await forceGc()
+
+    expect(qcRef.deref(), 'QueryClient should be GCd').toBeUndefined()
+    expect(routerRef.deref(), 'Router should be GCd').toBeUndefined()
+    expect(cacheRef.deref(), 'QueryCache should be GCd').toBeUndefined()
+  })
+
+  it('without cleanup, queryClient is retained (control)', async () => {
+    let queryClient: QueryClient | null = new QueryClient({
+      defaultOptions: { queries: { gcTime: 5 * 60 * 1000 } },
+    })
+    let serverRouter: ReturnType<typeof createServerRouter> | null =
+      createServerRouter()
+
+    serverRouter.router.serverSsr = undefined
+    setupCoreRouterSsrQueryIntegration({
+      router: serverRouter.router as any,
+      queryClient,
+    })
+    serverRouter.attachServerSsr()
+
+    queryClient.setQueryData(['a'], 'data-a')
+    await serverRouter.router.options.dehydrate?.()
+
+    const qcRef = new WeakRef(queryClient)
+
+    // Drop strong refs WITHOUT triggering cleanup.
+    queryClient = null
+    serverRouter = null
+
+    try {
+      await forceGc()
+
+      // Subscriber closure + gcTime timers keep it alive. This is the bug
+      // we are guarding against; if this ever passes (returns undefined) the
+      // production retention chain has changed and the cleanup-based test
+      // above may also need re-validation.
+      expect(qcRef.deref()).toBeDefined()
+    } finally {
+      // Avoid leaving the retained client + gcTime timers alive for up to
+      // 5 minutes after the test finishes.
+      qcRef.deref()?.clear()
+    }
+  })
+})
+
+// =====================================================================
+// CI-stable cleanup behavior tests. These do not rely on GC timing; they
+// assert the observable side-effects that make GC reclamation possible.
+// =====================================================================
+describe('SSR cleanup: deterministic behavior', () => {
+  it('teardown runs when cleanup fires before dehydrate (loader redirect/error case)', async () => {
+    const queryClient = track(new QueryClient())
+    const { router, triggerCleanup, attachServerSsr, setDehydrated } =
+      createServerRouter()
+
+    router.serverSsr = undefined
+    setupCoreRouterSsrQueryIntegration({
+      router: router as any,
+      queryClient,
+    })
+    attachServerSsr()
+
+    // Cleanup registration happens when server SSR attaches, before loaders.
+    setDehydrated(true)
+    await queryClient.fetchQuery({
+      queryKey: ['early'],
+      queryFn: () => 'data',
+    })
+
+    expect(queryClient.getQueryData(['early'])).toBe('data')
+
+    // Trigger cleanup as createRequestHandler's finally block would.
+    triggerCleanup()
+
+    // After cleanup the cache must be cleared (gcTime timers gone).
+    expect(queryClient.getQueryData(['early'])).toBeUndefined()
+  })
+
+  it('cancels in-flight queries on cleanup (signal aborted)', async () => {
+    const queryClient = track(new QueryClient())
+    const { router, triggerCleanup, attachServerSsr, setDehydrated } =
+      createServerRouter()
+
+    router.serverSsr = undefined
+    setupCoreRouterSsrQueryIntegration({
+      router: router as any,
+      queryClient,
+    })
+    attachServerSsr()
+    setDehydrated(true)
+
+    let observedAborted = false
+    const queryStarted = createDeferred<void>()
+    const inflight = queryClient.fetchQuery({
+      queryKey: ['slow'],
+      queryFn: ({ signal }) =>
+        new Promise<string>((_resolve, reject) => {
+          signal.addEventListener('abort', () => {
+            observedAborted = true
+            reject(new Error('aborted'))
+          })
+          // Signal the test once the queryFn has actually started and the
+          // abort listener is wired up. No real timers required.
+          queryStarted.resolve()
+        }),
+    })
+    // Swallow the rejection from fetchQuery
+    inflight.catch(() => {})
+
+    await queryStarted.promise
+
+    triggerCleanup()
+    // Flush microtasks so the abort event handler runs.
+    await Promise.resolve()
+    await Promise.resolve()
+
+    expect(observedAborted).toBe(true)
+  })
+
+  it('cleanup is idempotent: listener runs exactly once even with repeated triggers', async () => {
+    const queryClient = track(new QueryClient())
+    const {
+      router,
+      triggerCleanup,
+      attachServerSsr,
+      setDehydrated,
+      cleanupListenerCount,
+    } = createServerRouter()
+
+    router.serverSsr = undefined
+    setupCoreRouterSsrQueryIntegration({
+      router: router as any,
+      queryClient,
+    })
+    attachServerSsr()
+    setDehydrated(true)
+
+    // Cleanup was registered at setup because serverSsr was already attached.
+    await queryClient.fetchQuery({
+      queryKey: ['x'],
+      queryFn: () => 'data',
+    })
+    expect(cleanupListenerCount()).toBe(1)
+    expect(queryClient.getQueryData(['x'])).toBe('data')
+
+    triggerCleanup()
+    // Cache cleared by teardown.
+    expect(queryClient.getQueryData(['x'])).toBeUndefined()
+
+    // Second trigger after listeners already drained: no throw, no
+    // re-registration (cleanupRegistered flag prevents re-subscribe).
+    expect(() => triggerCleanup()).not.toThrow()
+    expect(cleanupListenerCount()).toBe(0)
+  })
+
+  it('registers cleanup when serverSsr attaches after subscriber setup', async () => {
+    // Simulate user code prepopulating the cache inside getRouter() BEFORE
+    // attachRouterServerSsrUtils() runs. queryCache subscriber fires while
+    // serverSsr is undefined; cleanup still registers at attach time, before
+    // router.load() can throw in beforeLoad.
+    const queryClient = track(new QueryClient())
+    const {
+      router,
+      triggerCleanup,
+      attachServerSsr,
+      setDehydrated,
+      cleanupListenerCount,
+    } = createServerRouter()
+    // Detach to simulate pre-attach state.
+    router.serverSsr = undefined
+
+    setupCoreRouterSsrQueryIntegration({
+      router: router as any,
+      queryClient,
+    })
+
+    // Prepopulate before attach; queryCache event fires while serverSsr is
+    // undefined. This must not be the registration point.
+    await queryClient.fetchQuery({
+      queryKey: ['pre'],
+      queryFn: () => 'early',
+    })
+    expect(cleanupListenerCount()).toBe(0)
+
+    // attachRouterServerSsrUtils equivalent. No onBeforeLoad/dehydrate needed.
+    attachServerSsr()
+    setDehydrated(true)
+    expect(cleanupListenerCount()).toBe(1)
+
+    triggerCleanup()
+    expect(queryClient.getQueryData(['pre'])).toBeUndefined()
+  })
+})
diff --git a/packages/router-ssr-query-core/vite.config.ts b/packages/router-ssr-query-core/vite.config.ts
index 6a1940e56e..811b179d2d 100644
--- a/packages/router-ssr-query-core/vite.config.ts
+++ b/packages/router-ssr-query-core/vite.config.ts
@@ -1,8 +1,15 @@
+import path from 'node:path'
 import { defineConfig, mergeConfig } from 'vitest/config'
 import { tanstackViteConfig } from '@tanstack/vite-config'
 import packageJson from './package.json'
 import type { ViteUserConfig } from 'vitest/config'
 
+// GC/WeakRef tests are flaky in CI because V8 does not guarantee reclamation
+// timing. They are env-gated and only run with RUN_SSR_GC_TESTS=1. When the
+// flag is set we additionally enable --expose-gc and use the forks pool so
+// globalThis.gc() is available.
+const runGcTests = process.env.RUN_SSR_GC_TESTS === '1'
+
 const config = defineConfig({
   test: {
     name: packageJson.name,
@@ -10,6 +17,17 @@ const config = defineConfig({
     watch: false,
     environment: 'jsdom',
     typecheck: { enabled: true },
+    alias: {
+      // For tests only, resolve to development.ts which returns undefined
+      // so that router.isServer fallback is used (mirrors router-core).
+      '@tanstack/router-core/isServer': path.resolve(
+        __dirname,
+        '../router-core/src/isServer/development.ts',
+      ),
+    },
+    ...(runGcTests
+      ? { pool: 'forks' as const, execArgv: ['--expose-gc'] }
+      : {}),
   },
 })
 
diff --git a/packages/solid-router/src/ssr/renderRouterToStream.tsx b/packages/solid-router/src/ssr/renderRouterToStream.tsx
index 9f386d7d97..8914c117d9 100644
--- a/packages/solid-router/src/ssr/renderRouterToStream.tsx
+++ b/packages/solid-router/src/ssr/renderRouterToStream.tsx
@@ -1,11 +1,38 @@
 import * as Solid from 'solid-js/web'
 import { isbot } from 'isbot'
-import { transformReadableStreamWithRouter } from '@tanstack/router-core/ssr/server'
+import {
+  createSsrStreamResponse,
+  transformReadableStreamWithRouter,
+} from '@tanstack/router-core/ssr/server'
 import { makeSsrSerovalPlugin } from '@tanstack/router-core'
 import type { JSXElement } from 'solid-js'
 import type { ReadableStream } from 'node:stream/web'
 import type { AnyRouter } from '@tanstack/router-core'
 
+const noop = () => {}
+
+// Bot responses wait for the server renderer before streaming. If the request
+// disconnects during that wait, unblock so the pipe can abort and clean up.
+async function waitForReadyOrAbort(
+  ready: Promise<unknown>,
+  signal: AbortSignal,
+) {
+  let cleanup = noop
+  try {
+    await Promise.race([
+      ready,
+      new Promise<void>((resolve) => {
+        const onAbort = () => resolve()
+        cleanup = () => signal.removeEventListener('abort', onAbort)
+        signal.addEventListener('abort', onAbort, { once: true })
+        if (signal.aborted) resolve()
+      }),
+    ])
+  } finally {
+    cleanup()
+  }
+}
+
 export const renderRouterToStream = async ({
   request,
   router,
@@ -42,17 +69,111 @@ export const renderRouterToStream = async ({
     } as any,
   )
 
+  // Solid's `pipeTo(w)` takes a single arg (no signal overload) and locks
+  // `w` via `w.getWriter()`. To still own the lifecycle we hand Solid a
+  // proxy WritableStream that forwards into an inner writer we control on
+  // the real TransformStream writable. Aborting the inner writer errors
+  // the underlying readable (which our router transform reads from),
+  // surfacing the cancel through the response pipeline.
+  //
+  // RESIDUAL RISK: solid-js@1.x does NOT expose a disposal hook on
+  // `renderToStream`, and its internal write loop swallows writer
+  // rejections (`writer.write(...).catch(() => {})` in
+  // solid-js/web/dist/server.js). So aborting the inner writer stops
+  // outbound bytes but does not terminate Solid's render continuation
+  // if a Suspense/resource never resolves — those pending promise
+  // continuations remain scheduled and can retain children/context/
+  // request references via captured closures until natural completion
+  // or process exit. The request-scoped router graph itself is released
+  // by ServerSsr.cleanup() through the router stream lifecycle, so the leak
+  // is bounded to whatever the user's Suspense/resource closures capture.
+  // A hard upstream-abort guarantee would require a disposal API in solid-js.
+  const innerWriter = writable.getWriter()
+  let writerDone = false
+  const releaseWriter = () => {
+    try {
+      innerWriter.releaseLock()
+    } catch {
+      // already released / errored
+    }
+  }
+  const abortSolidPipe = (reason?: unknown) => {
+    if (writerDone) return
+    writerDone = true
+    void innerWriter
+      .abort(reason)
+      .catch(() => {})
+      .finally(releaseWriter)
+  }
+
+  const onRequestAbort = () => {
+    abortSolidPipe(request.signal.reason)
+  }
+
+  // Wire request abort before the bot all-ready wait. Otherwise a disconnect
+  // during `await stream` can leave this callback pending forever.
+  if (request.signal.aborted) {
+    onRequestAbort()
+  } else {
+    request.signal.addEventListener('abort', onRequestAbort, { once: true })
+    router.serverSsr?.onCleanup(() => {
+      request.signal.removeEventListener('abort', onRequestAbort)
+    })
+  }
+
   if (isbot(request.headers.get('User-Agent'))) {
-    await stream
+    await waitForReadyOrAbort(
+      Promise.resolve(stream as unknown),
+      request.signal,
+    )
+  }
+
+  const solidWritable = new WritableStream({
+    write(chunk) {
+      return innerWriter.write(chunk)
+    },
+    close() {
+      writerDone = true
+      return innerWriter.close().finally(releaseWriter)
+    },
+    abort(reason) {
+      writerDone = true
+      return innerWriter.abort(reason).finally(releaseWriter)
+    },
+  })
+
+  if (!request.signal.aborted) {
+    try {
+      void Promise.resolve(stream.pipeTo(solidWritable) as unknown).catch(
+        (err: any) => {
+          if (
+            writerDone ||
+            err?.name === 'AbortError' ||
+            err?.code === 'ABORT_ERR'
+          )
+            return
+          console.error('Error in Solid render stream:', err)
+          abortSolidPipe(err)
+        },
+      )
+    } catch (err: any) {
+      if (err?.name !== 'AbortError' && err?.code !== 'ABORT_ERR') {
+        console.error('Error in Solid render stream:', err)
+      }
+      abortSolidPipe(err)
+    }
   }
-  stream.pipeTo(writable)
 
   const responseStream = transformReadableStreamWithRouter(
     router,
     readable as unknown as ReadableStream,
+    { onAbort: abortSolidPipe },
+  )
+  return createSsrStreamResponse(
+    router,
+    new Response(responseStream as any, {
+      status: router.stores.statusCode.get(),
+      headers: responseHeaders,
+    }),
   )
-  return new Response(responseStream as any, {
-    status: router.stores.statusCode.get(),
-    headers: responseHeaders,
-  })
 }
diff --git a/packages/solid-router/tests/renderRouterToStream.test.tsx b/packages/solid-router/tests/renderRouterToStream.test.tsx
new file mode 100644
index 0000000000..ba5ee51ca0
--- /dev/null
+++ b/packages/solid-router/tests/renderRouterToStream.test.tsx
@@ -0,0 +1,147 @@
+import { afterEach, describe, expect, test, vi } from 'vitest'
+import { attachRouterServerSsrUtils } from '@tanstack/router-core/ssr/server'
+import { createMemoryHistory, createRootRoute, createRouter } from '../src'
+import type * as SolidWeb from 'solid-js/web'
+
+const solidMocks = vi.hoisted(() => ({
+  renderToStream: vi.fn(),
+  pipeTo: vi.fn(),
+}))
+
+vi.mock('solid-js/web', async () => {
+  const actual = await vi.importActual<typeof SolidWeb>('solid-js/web')
+  return {
+    ...actual,
+    renderToStream: solidMocks.renderToStream,
+  }
+})
+
+// Imported after mock so the wrapper picks up the mocked binding.
+const { renderRouterToStream } = await import('../src/ssr/renderRouterToStream')
+
+function unwrapResponse(
+  result: Awaited<ReturnType<typeof renderRouterToStream>>,
+) {
+  return result.response
+}
+
+afterEach(() => {
+  solidMocks.renderToStream.mockReset()
+  solidMocks.pipeTo.mockReset()
+  vi.restoreAllMocks()
+})
+
+async function buildRouter() {
+  const rootRoute = createRootRoute({
+    component: () => null,
+  })
+  const router = createRouter({
+    history: createMemoryHistory({ initialEntries: ['/'] }),
+    routeTree: rootRoute,
+  })
+  router.isServer = true
+  attachRouterServerSsrUtils({ router, manifest: undefined })
+  await router.load()
+  return router
+}
+
+function drainBody(response: Response) {
+  const reader = response.body!.getReader()
+  return (async () => {
+    for (;;) {
+      const { done } = await reader.read()
+      if (done) return true
+    }
+  })().catch(() => true)
+}
+
+describe('renderRouterToStream - bot abort', () => {
+  test('request abort during bot wait returns and terminates response stream', async () => {
+    const neverReady = new Promise<void>(() => {})
+    solidMocks.pipeTo.mockImplementationOnce(
+      (writable: WritableStream<Uint8Array>) => {
+        const writer = writable.getWriter()
+        return writer
+          .write(new TextEncoder().encode('<html><body>solid</body></html>'))
+          .catch(() => {})
+      },
+    )
+    solidMocks.renderToStream.mockImplementationOnce(
+      () =>
+        ({
+          then: neverReady.then.bind(neverReady),
+          pipeTo: solidMocks.pipeTo,
+        }) as any,
+    )
+
+    const router = await buildRouter()
+    const abortController = new AbortController()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const responsePromise = renderRouterToStream({
+        request: new Request('http://localhost/', {
+          headers: { 'User-Agent': 'Googlebot' },
+          signal: abortController.signal,
+        }),
+        router,
+        responseHeaders: new Headers(),
+        children: () => null,
+      })
+
+      await Promise.resolve()
+      abortController.abort(new Error('client-gone'))
+
+      const result = await Promise.race([
+        responsePromise,
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+
+      expect(result).not.toBe(false)
+      expect(solidMocks.pipeTo).not.toHaveBeenCalled()
+      const response = unwrapResponse(result as Exclude<typeof result, false>)
+
+      const terminated = await Promise.race([
+        drainBody(response),
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+
+      expect(terminated).toBe(true)
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('pipeTo rejection aborts writer and terminates response stream', async () => {
+    solidMocks.renderToStream.mockImplementationOnce(
+      () =>
+        ({
+          pipeTo: () => Promise.reject(new Error('solid-pipe-failed')),
+        }) as any,
+    )
+
+    const router = await buildRouter()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          children: () => null,
+        }),
+      )
+
+      const terminated = await Promise.race([
+        drainBody(response),
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+
+      expect(terminated).toBe(true)
+      expect(errorSpy).toHaveBeenCalled()
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+})
diff --git a/packages/start-server-core/src/createStartHandler.ts b/packages/start-server-core/src/createStartHandler.ts
index 0952576051..378ed50d2d 100644
--- a/packages/start-server-core/src/createStartHandler.ts
+++ b/packages/start-server-core/src/createStartHandler.ts
@@ -16,6 +16,10 @@ import {
   attachRouterServerSsrUtils,
   getNormalizedURL,
   getOrigin,
+  isSsrResponse,
+  normalizeSsrResponse,
+  replaceSsrResponse,
+  stripSsrResponseBody,
 } from '@tanstack/router-core/ssr/server'
 import {
   getStartContext,
@@ -48,7 +52,11 @@ import type {
   AnySerializationAdapter,
   Register,
 } from '@tanstack/router-core'
-import type { HandlerCallback } from '@tanstack/router-core/ssr/server'
+import type {
+  HandlerCallback,
+  HandlerCallbackResult,
+  SsrResponse,
+} from '@tanstack/router-core/ssr/server'
 import type { FinalManifestOptions } from './finalManifest'
 
 type TODO = any
@@ -194,7 +202,7 @@ function isSpecialResponse(value: unknown): value is Response {
  * Normalize middleware result to context shape
  */
 function handleCtxResult(result: TODO) {
-  if (isSpecialResponse(result)) {
+  if (isSsrResponse(result) || isSpecialResponse(result)) {
     return { response: result }
   }
   return result
@@ -203,8 +211,70 @@ function handleCtxResult(result: TODO) {
 /**
  * Execute a middleware chain
  */
-function executeMiddleware(middlewares: Array<TODO>, ctx: TODO): Promise<TODO> {
+async function executeMiddleware(
+  middlewares: Array<TODO>,
+  ctx: TODO,
+): Promise<{ ctx: TODO; response: HandlerCallbackResult }> {
   let index = -1
+  let streamResponse:
+    | Extract<SsrResponse, { serverSsrCleanup: 'stream' }>
+    | undefined
+
+  const setResponse = (response: TODO) => {
+    if (isSsrResponse(response)) {
+      if (response.serverSsrCleanup === 'stream') {
+        streamResponse = response
+      }
+      ctx.response = response.response
+      return
+    }
+
+    ctx.response = response
+  }
+
+  const disposeStreamResponse = async (reason: string) => {
+    const response = streamResponse
+    if (!response) {
+      return
+    }
+
+    streamResponse = undefined
+    const currentResponse = ctx.response
+    if (
+      currentResponse === response.response ||
+      (currentResponse instanceof Response &&
+        response.response.body !== null &&
+        currentResponse.body === response.response.body)
+    ) {
+      ctx.response = undefined
+    }
+    await response.dispose(reason)
+  }
+
+  const getFinalResponse = async (): Promise<HandlerCallbackResult> => {
+    const response = ctx.response
+    if (!response) {
+      throwRouteHandlerError()
+    }
+
+    if (!streamResponse) {
+      return response
+    }
+
+    if (response === streamResponse.response) {
+      return streamResponse
+    }
+
+    if (
+      streamResponse.response.body !== null &&
+      response.body === streamResponse.response.body
+    ) {
+      return { ...streamResponse, response }
+    }
+
+    await disposeStreamResponse('middleware response replaced')
+    return response
+  }
 
   const next = async (nextCtx?: TODO): Promise<TODO> => {
     // Merge context if provided using safeObjectMerge for prototype pollution prevention
@@ -214,7 +284,9 @@ function executeMiddleware(middlewares: Array<TODO>, ctx: TODO): Promise<TODO> {
       }
       // Copy own properties except context (Object.keys returns only own enumerable properties)
       for (const key of Object.keys(nextCtx)) {
-        if (key !== 'context') {
+        if (key === 'response') {
+          setResponse(nextCtx.response)
+        } else if (key !== 'context') {
           ctx[key] = nextCtx[key]
         }
       }
@@ -229,16 +301,17 @@ function executeMiddleware(middlewares: Array<TODO>, ctx: TODO): Promise<TODO> {
       result = await middleware({ ...ctx, next })
     } catch (err) {
       if (isSpecialResponse(err)) {
-        ctx.response = err
+        setResponse(err)
         return ctx
       }
+      await disposeStreamResponse('middleware error')
       throw err
     }
 
     const normalized = handleCtxResult(result)
     if (normalized) {
       if (normalized.response !== undefined) {
-        ctx.response = normalized.response
+        setResponse(normalized.response)
       }
       if (normalized.context) {
         ctx.context = safeObjectMerge(ctx.context, normalized.context)
@@ -248,7 +321,8 @@ function executeMiddleware(middlewares: Array<TODO>, ctx: TODO): Promise<TODO> {
     return ctx
   }
 
-  return next()
+  await next()
+  return { ctx, response: await getFinalResponse() }
 }
 
 /**
@@ -327,7 +401,7 @@ export function createStartHandler<TRegister = Register>(
     requestOpts,
   ) => {
     let router: AnyRouter | null = null as AnyRouter | null
-    let cbWillCleanup = false as boolean
+    let responseOwnsCleanup = false as boolean
 
     try {
       // normalizing and sanitizing the pathname here for server, so we always deal with the same format during SSR.
@@ -447,21 +521,30 @@ export function createStartHandler<TRegister = Register>(
         const middlewares = flattenedRequestMiddlewares.map(
           (d) => d.options.server,
         )
-        const ctx = await executeMiddleware([...middlewares, serverFnHandler], {
-          request,
-          pathname: url.pathname,
-          handlerType: 'serverFn',
-          context: createNullProtoObject(requestOpts?.context),
-        })
+        const { response: middlewareResponse } = await executeMiddleware(
+          [...middlewares, serverFnHandler],
+          {
+            request,
+            pathname: url.pathname,
+            handlerType: 'serverFn',
+            context: createNullProtoObject(requestOpts?.context),
+          },
+        )
 
-        return handleRedirectResponse(ctx.response, request, getRouter)
+        const result = await handleRedirectResponse(
+          middlewareResponse,
+          request,
+          getRouter,
+        )
+        responseOwnsCleanup = result.serverSsrCleanup === 'stream'
+        return result.response
       }
 
       // Router execution function
       const executeRouter = async (
         serverContext: TODO,
         matchedRoutes?: ReadonlyArray<AnyRoute>,
-      ): Promise<Response> => {
+      ): Promise<SsrResponse> => {
         const acceptHeader = request.headers.get('Accept') || '*/*'
         const acceptParts = acceptHeader.split(',')
         const supportedMimeTypes = ['*/*', 'text/html']
@@ -471,9 +554,11 @@ export function createStartHandler<TRegister = Register>(
         )
 
         if (!isSupported) {
-          return Response.json(
-            { error: 'Only HTML requests are supported here' },
-            { status: 500 },
+          return normalizeSsrResponse(
+            Response.json(
+              { error: 'Only HTML requests are supported here' },
+              { status: 500 },
+            ),
           )
         }
 
@@ -503,7 +588,7 @@ export function createStartHandler<TRegister = Register>(
         await routerInstance.load()
 
         if (routerInstance.state.redirect) {
-          return routerInstance.state.redirect
+          return normalizeSsrResponse(routerInstance.state.redirect)
         }
 
         earlyHints?.collectDynamic(routerInstance.stores.matches.get())
@@ -518,13 +603,12 @@ export function createStartHandler<TRegister = Register>(
           router: routerInstance,
         })
         earlyHints?.appendResponseHeaders(responseHeaders)
-        cbWillCleanup = true
-
-        return cb({
+        const response = await cb({
           request,
           router: routerInstance,
           responseHeaders,
         })
+        return normalizeSsrResponse(response)
       }
 
       // Main request handler
@@ -561,7 +645,7 @@ export function createStartHandler<TRegister = Register>(
       const middlewares = flattenedRequestMiddlewares.map(
         (d) => d.options.server,
       )
-      const ctx = await executeMiddleware(
+      const { response: middlewareResponse } = await executeMiddleware(
         [...middlewares, requestHandlerMiddleware],
         {
           request,
@@ -571,14 +655,19 @@ export function createStartHandler<TRegister = Register>(
         },
       )
 
-      return handleRedirectResponse(ctx.response, request, getRouter)
+      const response = await handleRedirectResponse(
+        middlewareResponse,
+        request,
+        getRouter,
+      )
+      responseOwnsCleanup = response.serverSsrCleanup === 'stream'
+      return response.response
     } finally {
-      if (router && !cbWillCleanup) {
+      if (router?.serverSsr && !responseOwnsCleanup) {
         // Clean up router SSR state if it was set up but won't be cleaned up by the callback
         // (e.g., in redirect cases or early returns before the callback is invoked).
-        // When the callback runs, it handles cleanup (either via transformStreamWithRouter
-        // for streaming, or directly in renderRouterToString for non-streaming).
-        router.serverSsr?.cleanup()
+        // Transformed streaming response bodies clean up when consumed/cancelled.
+        router.serverSsr.cleanup()
       }
       router = null
     }
@@ -588,25 +677,30 @@ export function createStartHandler<TRegister = Register>(
 }
 
 async function handleRedirectResponse(
-  response: Response,
+  response: HandlerCallbackResult,
   request: Request,
   getRouter: () => Promise<AnyRouter>,
-): Promise<Response> {
-  if (!isRedirect(response)) {
-    return response
+): Promise<SsrResponse> {
+  const ssrResponse = normalizeSsrResponse(response)
+  if (!isRedirect(ssrResponse.response)) {
+    return ssrResponse
   }
 
-  if (isResolvedRedirect(response)) {
+  if (isResolvedRedirect(ssrResponse.response)) {
     if (request.headers.get('x-tsr-serverFn') === 'true') {
-      return Response.json(
-        { ...response.options, isSerializedRedirect: true },
-        { headers: response.headers },
+      return replaceSsrResponse(
+        ssrResponse,
+        Response.json(
+          { ...ssrResponse.response.options, isSerializedRedirect: true },
+          { headers: ssrResponse.response.headers },
+        ),
+        'redirect response replaced',
       )
     }
-    return response
+    return ssrResponse
   }
 
-  const opts = response.options
+  const opts = ssrResponse.response.options
   if (opts.to && typeof opts.to === 'string' && !opts.to.startsWith('/')) {
     throw new Error(
       `Server side redirects must use absolute paths via the 'href' or 'to' options. The redirect() method's "to" property accepts an internal path only. Use the "href" property to provide an external URL. Received: ${JSON.stringify(opts)}`,
@@ -629,16 +723,20 @@ async function handleRedirectResponse(
   }
 
   const router = await getRouter()
-  const redirect = router.resolveRedirect(response)
+  const redirect = router.resolveRedirect(ssrResponse.response)
 
   if (request.headers.get('x-tsr-serverFn') === 'true') {
-    return Response.json(
-      { ...response.options, isSerializedRedirect: true },
-      { headers: response.headers },
+    return replaceSsrResponse(
+      ssrResponse,
+      Response.json(
+        { ...ssrResponse.response.options, isSerializedRedirect: true },
+        { headers: ssrResponse.response.headers },
+      ),
+      'redirect response replaced',
     )
   }
 
-  return redirect
+  return replaceSsrResponse(ssrResponse, redirect, 'redirect response replaced')
 }
 
 async function handleServerRoutes({
@@ -655,10 +753,10 @@ async function handleServerRoutes({
   executeRouter: (
     serverContext: any,
     matchedRoutes?: ReadonlyArray<AnyRoute>,
-  ) => Promise<Response>
+  ) => Promise<SsrResponse>
   context: any
   executedRequestMiddlewares: Set<AnyRequestMiddleware>
-}): Promise<Response> {
+}): Promise<SsrResponse> {
   const router = await getRouter()
   const rewrittenUrl = executeRewriteInput(router.rewrite, url)
   const pathname = rewrittenUrl.pathname
@@ -728,11 +826,10 @@ async function handleServerRoutes({
   }
 
   // Final middleware: execute router with matched routes for dev styles
-  routeMiddlewares.push((ctx: TODO) =>
-    executeRouter(ctx.context, matchedRoutes),
-  )
+  routeMiddlewares.push(((ctx: TODO) =>
+    executeRouter(ctx.context, matchedRoutes)) as TODO)
 
-  const ctx = await executeMiddleware(routeMiddlewares, {
+  const { ctx, response } = await executeMiddleware(routeMiddlewares, {
     request,
     context,
     params: routeParams,
@@ -747,13 +844,9 @@ async function handleServerRoutes({
       throwRouteHandlerError()
     }
 
-    const resolved = await handleRedirectResponse(
-      ctx.response,
-      request,
-      getRouter,
-    )
-    return new Response(null, resolved)
+    const resolved = await handleRedirectResponse(response, request, getRouter)
+    return stripSsrResponseBody(resolved, 'HEAD body stripped')
   }
 
-  return ctx.response
+  return normalizeSsrResponse(response)
 }
diff --git a/packages/start-server-core/tests/createStartHandler.test.ts b/packages/start-server-core/tests/createStartHandler.test.ts
index bf93350b06..5b7c7d3a7a 100644
--- a/packages/start-server-core/tests/createStartHandler.test.ts
+++ b/packages/start-server-core/tests/createStartHandler.test.ts
@@ -1,9 +1,330 @@
-import { describe, expect, it, vi } from 'vitest'
+import { afterAll, afterEach, describe, expect, it, vi } from 'vitest'
+import { createMemoryHistory } from '@tanstack/history'
+import { createMiddleware } from '@tanstack/start-client-core'
+import { BaseRootRoute, BaseRoute, RouterCore } from '@tanstack/router-core'
+import {
+  createNonReactiveMutableStore,
+  createNonReactiveReadonlyStore,
+} from '@tanstack/router-core'
+import {
+  attachRouterServerSsrUtils,
+  createSsrStreamResponse,
+} from '@tanstack/router-core/ssr/server'
+import { createStartHandler } from '../src/createStartHandler'
 import {
   getStaticHandlerInlineCssDefault,
   resolveInlineCssForRequest,
 } from '../src/inlineCss'
 
+const startMocks = vi.hoisted(() => {
+  const previousServerFnBase = process.env.TSS_SERVER_FN_BASE
+  process.env.TSS_SERVER_FN_BASE = '/_serverFn/'
+  return {
+    previousServerFnBase,
+    requestMiddleware: [] as Array<any>,
+    serverFnResult: undefined as undefined | Response | object,
+    router: undefined as undefined | ReturnType<typeof makeRouter>,
+  }
+})
+
+vi.mock('#tanstack-start-entry', () => ({
+  startInstance: {
+    getOptions: () => ({
+      requestMiddleware: startMocks.requestMiddleware,
+      serializationAdapters: [],
+    }),
+  },
+}))
+
+vi.mock('#tanstack-router-entry', () => ({
+  getRouter: () => startMocks.router,
+}))
+
+vi.mock('../src/server-functions-handler', () => ({
+  handleServerAction: () => startMocks.serverFnResult,
+}))
+
+const getStoreConfig = () => ({
+  createMutableStore: createNonReactiveMutableStore,
+  createReadonlyStore: createNonReactiveReadonlyStore,
+  batch: (fn: () => void) => fn(),
+})
+
+function makeRouter() {
+  const rootRoute = new BaseRootRoute({})
+  const indexRoute = new BaseRoute({
+    getParentRoute: () => rootRoute,
+    path: '/',
+    component: () => null,
+  })
+  const router = new RouterCore(
+    {
+      history: createMemoryHistory({ initialEntries: ['/'] }),
+      routeTree: rootRoute.addChildren([indexRoute]),
+    },
+    getStoreConfig,
+  )
+  router.isServer = true
+  return router
+}
+
+function makeStreamResponse(router: ReturnType<typeof makeRouter>) {
+  attachRouterServerSsrUtils({ router: router as any, manifest: undefined })
+  const stream = new ReadableStream({
+    start(controller) {
+      controller.enqueue(new TextEncoder().encode('stream'))
+    },
+    cancel() {
+      router.serverSsr?.cleanup()
+    },
+  })
+  return createSsrStreamResponse(router as any, new Response(stream))
+}
+
+afterEach(() => {
+  startMocks.requestMiddleware = []
+  startMocks.serverFnResult = undefined
+  startMocks.router = undefined
+  vi.unstubAllEnvs()
+})
+
+afterAll(() => {
+  if (startMocks.previousServerFnBase === undefined) {
+    delete (process.env as Partial<NodeJS.ProcessEnv>).TSS_SERVER_FN_BASE
+  } else {
+    process.env.TSS_SERVER_FN_BASE = startMocks.previousServerFnBase
+  }
+})
+
+describe('createStartHandler SSR cleanup ownership', () => {
+  it('preserves serverFn stream cleanup ownership through early return', async () => {
+    startMocks.requestMiddleware = []
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(ssrResponse.response)
+    expect(dispose).not.toHaveBeenCalled()
+    expect(router.serverSsr).toBeDefined()
+
+    await response.body!.cancel('done')
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('disposes stream response replaced by middleware result', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    const replacement = new Response('replacement')
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        await next()
+        return replacement
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(replacement)
+    expect(dispose).toHaveBeenCalledOnce()
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('exposes Response to middleware while preserving stream ownership', async () => {
+    startMocks.requestMiddleware = []
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const seenHeaders = [] as Array<Headers | undefined>
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        const result = await next()
+        seenHeaders.push(result.response.headers)
+        result.response.headers.set('x-test', 'true')
+        return result
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(ssrResponse.response)
+    expect(seenHeaders).toEqual([ssrResponse.response.headers])
+    expect(response.headers.get('x-test')).toBe('true')
+    expect(router.serverSsr).toBeDefined()
+
+    await response.body!.cancel('done')
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('preserves stream ownership through return next', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    startMocks.requestMiddleware = [
+      createMiddleware().server(({ next }) => {
+        return next()
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(ssrResponse.response)
+    expect(dispose).not.toHaveBeenCalled()
+    expect(router.serverSsr).toBeDefined()
+
+    await response.body!.cancel('done')
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('preserves stream ownership when middleware wraps same body', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    let wrappedResponse: Response | undefined
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        const result = await next()
+        wrappedResponse = new Response(result.response.body, result.response)
+        wrappedResponse.headers.set('x-wrapped', 'true')
+        return wrappedResponse
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(wrappedResponse)
+    expect(response).not.toBe(ssrResponse.response)
+    expect(response.headers.get('x-wrapped')).toBe('true')
+    expect(dispose).not.toHaveBeenCalled()
+    expect(router.serverSsr).toBeDefined()
+
+    await response.body!.cancel('done')
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('disposes stream response on middleware error after next', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        await next()
+        throw new Error('middleware failed')
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response.status).toBe(500)
+    expect(dispose).toHaveBeenCalledOnce()
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('disposes stream response replaced by thrown response', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    const replacement = new Response('handled', { status: 418 })
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        await next()
+        throw replacement
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(replacement)
+    expect(dispose).toHaveBeenCalledOnce()
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  it('honors in-place response assignment on returned context', async () => {
+    const router = makeRouter()
+    startMocks.router = router
+    const ssrResponse = makeStreamResponse(router)
+    startMocks.serverFnResult = ssrResponse
+    const dispose = vi.spyOn(ssrResponse as any, 'dispose')
+    const replacement = new Response('replacement')
+    startMocks.requestMiddleware = [
+      createMiddleware().server(async ({ next }) => {
+        const result = await next()
+        result.response = replacement
+        return result
+      }),
+    ]
+
+    const handler = createStartHandler(() => new Response('unused'))
+    const response = await handler(
+      new Request('http://localhost/_serverFn/test', {
+        headers: { 'x-tsr-serverFn': 'true' },
+      }),
+      {},
+    )
+
+    expect(response).toBe(replacement)
+    expect(dispose).toHaveBeenCalledOnce()
+    expect(router.serverSsr).toBeUndefined()
+  })
+})
+
 describe('createStartHandler inlineCss option', () => {
   const request = new Request('https://example.com/')
 
diff --git a/packages/start-server-core/tests/fixtures/start-manifest.ts b/packages/start-server-core/tests/fixtures/start-manifest.ts
new file mode 100644
index 0000000000..27ee4ced1f
--- /dev/null
+++ b/packages/start-server-core/tests/fixtures/start-manifest.ts
@@ -0,0 +1,6 @@
+export const tsrStartManifest = () => ({
+  clientEntry: '/assets/client.js',
+  routes: {
+    __root__: {},
+  },
+})
diff --git a/packages/start-server-core/vite.config.ts b/packages/start-server-core/vite.config.ts
index fd629aaeed..8205090d41 100644
--- a/packages/start-server-core/vite.config.ts
+++ b/packages/start-server-core/vite.config.ts
@@ -1,6 +1,7 @@
 import { defineConfig, mergeConfig } from 'vitest/config'
 import { tanstackViteConfig } from '@tanstack/vite-config'
 import packageJson from './package.json'
+import { fileURLToPath } from 'node:url'
 // this needs to be imported from the actual file instead of from 'index.tsx'
 // so we don't trigger the import of a `?script-string` import before the minifyScriptPlugin is setup
 import { VIRTUAL_MODULES } from './src/virtual-modules'
@@ -14,25 +15,46 @@ const config = defineConfig({
   },
 })
 
+const fakeStartEntry = fileURLToPath(
+  new URL('../start-client-core/src/fake-entries/start.ts', import.meta.url),
+)
+const fakeRouterEntry = fileURLToPath(
+  new URL('../start-client-core/src/fake-entries/router.ts', import.meta.url),
+)
+const fakeStartManifest = fileURLToPath(
+  new URL('./tests/fixtures/start-manifest.ts', import.meta.url),
+)
+
 export default mergeConfig(
   config,
-  tanstackViteConfig({
-    tsconfigPath: './tsconfig.build.json',
-    srcDir: './src',
-    entry: [
-      './src/index.tsx',
-      './src/createServerRpc.ts',
-      './src/createSsrRpc.ts',
-      './src/fake-start-server-fn-resolver.ts',
-      './src/empty-plugin-adapters.ts',
-    ],
-    externalDeps: [
-      ...Object.values(VIRTUAL_MODULES),
-      '#tanstack-start-entry',
-      '#tanstack-router-entry',
-      '#tanstack-start-server-fn-resolver',
-      '#tanstack-start-plugin-adapters',
-    ],
-    cjs: false,
-  }),
+  mergeConfig(
+    tanstackViteConfig({
+      tsconfigPath: './tsconfig.build.json',
+      srcDir: './src',
+      entry: [
+        './src/index.tsx',
+        './src/createServerRpc.ts',
+        './src/createSsrRpc.ts',
+        './src/fake-start-server-fn-resolver.ts',
+        './src/empty-plugin-adapters.ts',
+      ],
+      externalDeps: [
+        ...Object.values(VIRTUAL_MODULES),
+        '#tanstack-start-entry',
+        '#tanstack-router-entry',
+        '#tanstack-start-server-fn-resolver',
+        '#tanstack-start-plugin-adapters',
+      ],
+      cjs: false,
+    }),
+    defineConfig({
+      resolve: {
+        alias: {
+          '#tanstack-start-entry': fakeStartEntry,
+          '#tanstack-router-entry': fakeRouterEntry,
+          'tanstack-start-manifest:v': fakeStartManifest,
+        },
+      },
+    }),
+  ),
 )
diff --git a/packages/vue-router/src/ssr/renderRouterToStream.tsx b/packages/vue-router/src/ssr/renderRouterToStream.tsx
index 75c717128a..3b122fda6b 100644
--- a/packages/vue-router/src/ssr/renderRouterToStream.tsx
+++ b/packages/vue-router/src/ssr/renderRouterToStream.tsx
@@ -2,7 +2,10 @@ import { ReadableStream as NodeReadableStream } from 'node:stream/web'
 import * as Vue from 'vue'
 import { pipeToWebWritable, renderToString } from 'vue/server-renderer'
 import { isbot } from 'isbot'
-import { transformReadableStreamWithRouter } from '@tanstack/router-core/ssr/server'
+import {
+  createSsrStreamResponse,
+  transformReadableStreamWithRouter,
+} from '@tanstack/router-core/ssr/server'
 import type { AnyRouter } from '@tanstack/router-core'
 import type { Component } from 'vue'
 
@@ -11,27 +14,46 @@ function prependDoctype(
 ): NodeReadableStream<Uint8Array> {
   const encoder = new TextEncoder()
   let sentDoctype = false
+  let reader: ReadableStreamDefaultReader<Uint8Array> | undefined
+  const releaseReader = () => {
+    try {
+      reader?.releaseLock()
+    } catch {
+      // ignore
+    }
+    reader = undefined
+  }
 
   return new NodeReadableStream<Uint8Array>({
-    start(controller) {
-      const reader = readable.getReader()
-
-      async function pump(): Promise<void> {
-        const { done, value } = await reader.read()
+    start() {
+      reader = readable.getReader()
+    },
+    async pull(controller) {
+      if (!sentDoctype) {
+        sentDoctype = true
+        controller.enqueue(encoder.encode('<!DOCTYPE html>'))
+        return
+      }
+      try {
+        const { done, value } = await reader!.read()
         if (done) {
           controller.close()
+          releaseReader()
           return
         }
-
-        if (!sentDoctype) {
-          sentDoctype = true
-          controller.enqueue(encoder.encode('<!DOCTYPE html>'))
-        }
         controller.enqueue(value)
-        return pump()
+      } catch (err) {
+        controller.error(err)
+        releaseReader()
       }
-
-      pump().catch((err) => controller.error(err))
+    },
+    async cancel(reason) {
+      try {
+        await reader?.cancel(reason)
+      } catch {
+        // ignore
+      }
+      releaseReader()
     },
   })
 }
@@ -50,35 +72,116 @@ export const renderRouterToStream = async ({
   const app = Vue.createSSRApp(App, { router })
 
   if (isbot(request.headers.get('User-Agent'))) {
-    let fullHtml = await renderToString(app)
+    try {
+      let cleanupAbortListener: (() => void) | undefined
+      const abortPromise = new Promise<never>((_, reject) => {
+        if (request.signal.aborted) {
+          reject(request.signal.reason)
+          return
+        }
+        const onRequestAbort = () => reject(request.signal.reason)
+        request.signal.addEventListener('abort', onRequestAbort, { once: true })
+        cleanupAbortListener = () => {
+          request.signal.removeEventListener('abort', onRequestAbort)
+        }
+      })
 
-    const htmlOpenIndex = fullHtml.indexOf('<html')
-    const htmlCloseIndex = fullHtml.indexOf('</html>')
+      let fullHtml = await Promise.race([
+        renderToString(app),
+        abortPromise,
+      ]).finally(() => cleanupAbortListener?.())
 
-    if (htmlOpenIndex !== -1 && htmlCloseIndex !== -1) {
-      fullHtml = fullHtml.slice(htmlOpenIndex, htmlCloseIndex + 7)
-    } else if (htmlOpenIndex !== -1) {
-      fullHtml = fullHtml.slice(htmlOpenIndex)
-    }
+      router.serverSsr!.setRenderFinished()
+      const injectedHtml = router.serverSsr!.takeBufferedHtml()
+      if (injectedHtml) {
+        fullHtml = fullHtml.replace(`</body>`, () => `${injectedHtml}</body>`)
+      }
 
-    return new Response(`<!DOCTYPE html>${fullHtml}`, {
-      status: router.stores.statusCode.get(),
-      headers: responseHeaders,
-    })
+      const htmlOpenIndex = fullHtml.indexOf('<html')
+      const htmlCloseIndex = fullHtml.indexOf('</html>')
+
+      if (htmlOpenIndex !== -1 && htmlCloseIndex !== -1) {
+        fullHtml = fullHtml.slice(htmlOpenIndex, htmlCloseIndex + 7)
+      } else if (htmlOpenIndex !== -1) {
+        fullHtml = fullHtml.slice(htmlOpenIndex)
+      }
+
+      return new Response(`<!DOCTYPE html>${fullHtml}`, {
+        status: router.stores.statusCode.get(),
+        headers: responseHeaders,
+      })
+    } finally {
+      router.serverSsr?.cleanup()
+    }
   }
 
   const { writable, readable } = new TransformStream()
+  const innerWriter = writable.getWriter()
+  let writerDone = false
+  const releaseWriter = () => {
+    try {
+      innerWriter.releaseLock()
+    } catch {
+      // already released / errored
+    }
+  }
+  const abortVuePipe = (reason?: unknown) => {
+    if (writerDone) return
+    writerDone = true
+    void innerWriter
+      .abort(reason)
+      .catch(() => {})
+      .finally(releaseWriter)
+  }
 
-  pipeToWebWritable(app, {}, writable)
+  const vueWritable = new WritableStream({
+    write(chunk) {
+      return innerWriter.write(chunk)
+    },
+    close() {
+      writerDone = true
+      return innerWriter.close().finally(releaseWriter)
+    },
+    abort(reason) {
+      writerDone = true
+      return innerWriter.abort(reason).finally(releaseWriter)
+    },
+  })
+
+  // `pipeToWebWritable` returns void (see @vue/server-renderer). Pass a
+  // proxy writable so request aborts can abort the real TransformStream
+  // writer even while Vue holds a lock on the proxy writable.
+  try {
+    pipeToWebWritable(app, {}, vueWritable)
+  } catch (err) {
+    console.error('Error in Vue pipeToWebWritable:', err)
+    // Setup failed before any pipe was wired; abort writable so the
+    // readable side errors instead of hanging until the lifetime timeout.
+    abortVuePipe(err)
+  }
+
+  if (request.signal.aborted) {
+    abortVuePipe(request.signal.reason)
+  } else {
+    const onRequestAbort = () => abortVuePipe(request.signal.reason)
+    request.signal.addEventListener('abort', onRequestAbort, { once: true })
+    router.serverSsr?.onCleanup(() => {
+      request.signal.removeEventListener('abort', onRequestAbort)
+    })
+  }
 
   const doctypedStream = prependDoctype(readable)
   const responseStream = transformReadableStreamWithRouter(
     router,
     doctypedStream,
+    { onAbort: abortVuePipe },
   )
 
-  return new Response(responseStream as any, {
-    status: router.stores.statusCode.get(),
-    headers: responseHeaders,
-  })
+  return createSsrStreamResponse(
+    router,
+    new Response(responseStream as any, {
+      status: router.stores.statusCode.get(),
+      headers: responseHeaders,
+    }),
+  )
 }
diff --git a/packages/vue-router/tests/renderRouterToStream.test.tsx b/packages/vue-router/tests/renderRouterToStream.test.tsx
new file mode 100644
index 0000000000..781096185f
--- /dev/null
+++ b/packages/vue-router/tests/renderRouterToStream.test.tsx
@@ -0,0 +1,165 @@
+import { afterEach, describe, expect, test, vi } from 'vitest'
+import {
+  attachRouterServerSsrUtils,
+  normalizeSsrResponse,
+} from '@tanstack/router-core/ssr/server'
+import { createMemoryHistory, createRootRoute, createRouter } from '../src'
+import type * as VueServerRenderer from 'vue/server-renderer'
+
+const rendererMocks = vi.hoisted(() => ({
+  pipeToWebWritable: vi.fn(),
+  renderToString: vi.fn(),
+}))
+
+vi.mock('vue/server-renderer', async () => {
+  const actual = await vi.importActual<typeof VueServerRenderer>(
+    'vue/server-renderer',
+  )
+  return {
+    ...actual,
+    pipeToWebWritable: rendererMocks.pipeToWebWritable,
+    renderToString: rendererMocks.renderToString,
+  }
+})
+
+// Imported after mock so the wrapper picks up the mocked binding.
+const { renderRouterToStream } = await import('../src/ssr/renderRouterToStream')
+
+function unwrapResponse(
+  result: Awaited<ReturnType<typeof renderRouterToStream>>,
+) {
+  return normalizeSsrResponse(result).response
+}
+
+afterEach(() => {
+  rendererMocks.pipeToWebWritable.mockReset()
+  rendererMocks.renderToString.mockReset()
+  vi.restoreAllMocks()
+})
+
+async function buildRouter() {
+  const rootRoute = createRootRoute({
+    component: { template: '<div/>' } as any,
+  })
+  const router = createRouter({
+    history: createMemoryHistory({ initialEntries: ['/'] }),
+    routeTree: rootRoute,
+  })
+  router.isServer = true
+  attachRouterServerSsrUtils({ router, manifest: undefined })
+  await router.load()
+  return router
+}
+
+function drainBody(response: Response) {
+  const reader = response.body!.getReader()
+  return (async () => {
+    for (;;) {
+      const { done } = await reader.read()
+      if (done) return true
+    }
+  })().catch(() => true)
+}
+
+describe('renderRouterToStream - sync setup failures', () => {
+  test('bot string response injects final scripts and cleans up', async () => {
+    rendererMocks.renderToString.mockResolvedValueOnce(
+      '<html><body><main>bot</main></body></html>',
+    )
+    const router = await buildRouter()
+    await router.serverSsr!.dehydrate()
+    const cleanup = vi.spyOn(router.serverSsr!, 'cleanup')
+
+    const response = unwrapResponse(
+      await renderRouterToStream({
+        request: new Request('http://localhost/', {
+          headers: { 'User-Agent': 'Googlebot' },
+        }),
+        router,
+        responseHeaders: new Headers(),
+        App: { template: '<div/>' } as any,
+      }),
+    )
+
+    const html = await response.text()
+    expect(html).toContain('$_TSR.e()')
+    expect(html.indexOf('$_TSR.e()')).toBeLessThan(html.indexOf('</body>'))
+    expect(cleanup).toHaveBeenCalledOnce()
+    expect(router.serverSsr).toBeUndefined()
+  })
+
+  test('pipeToWebWritable sync throw terminates response stream', async () => {
+    rendererMocks.pipeToWebWritable.mockImplementationOnce(() => {
+      throw new Error('forced-sync-setup-throw')
+    })
+    const router = await buildRouter()
+
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/'),
+          router,
+          responseHeaders: new Headers(),
+          App: { template: '<div/>' } as any,
+        }),
+      )
+
+      const terminated = await Promise.race([
+        drainBody(response),
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+
+      expect(terminated).toBe(true)
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+
+  test('request abort aborts Vue writer and terminates response stream', async () => {
+    let vueWriter: WritableStreamDefaultWriter<Uint8Array> | undefined
+    rendererMocks.pipeToWebWritable.mockImplementationOnce(
+      (
+        _app: unknown,
+        _context: unknown,
+        writable: WritableStream<Uint8Array>,
+      ) => {
+        vueWriter = writable.getWriter()
+      },
+    )
+
+    const router = await buildRouter()
+    const abortController = new AbortController()
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    try {
+      const response = unwrapResponse(
+        await renderRouterToStream({
+          request: new Request('http://localhost/', {
+            signal: abortController.signal,
+          }),
+          router,
+          responseHeaders: new Headers(),
+          App: { template: '<div/>' } as any,
+        }),
+      )
+
+      expect(vueWriter).toBeDefined()
+      abortController.abort(new Error('client-gone'))
+
+      await expect(
+        vueWriter!.write(new TextEncoder().encode('<div/>')),
+      ).rejects.toBeTruthy()
+
+      const terminated = await Promise.race([
+        drainBody(response),
+        new Promise<false>((resolve) => setTimeout(() => resolve(false), 2000)),
+      ])
+
+      expect(terminated).toBe(true)
+    } finally {
+      errorSpy.mockRestore()
+      router.serverSsr?.cleanup()
+    }
+  })
+})