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chore: upgrade h3 and cookie-es #7044

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62cf03d
upgrade and unpin h3 in start-server-core
ulrichstark Mar 26, 2026
0713e9b
handle that h3's parseCookies returns undefined values
ulrichstark Mar 26, 2026
97b4906
bump cookie-es
birkskyum Mar 29, 2026
4d84574
remove unnecessary any
ulrichstark Mar 29, 2026
c15834b
try nx's workaround for malformed paths
ulrichstark Mar 29, 2026
75c727f
Revert "try nx's workaround for malformed paths"
ulrichstark Mar 29, 2026
dcff88a
prevent prototype pollution
ulrichstark Mar 29, 2026
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2 changes: 1 addition & 1 deletion packages/router-core/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,7 @@
},
"dependencies": {
"@tanstack/history": "workspace:*",
"cookie-es": "^2.0.0",
"cookie-es": "^3.0.0",
"seroval": "^1.4.2",
"seroval-plugins": "^1.4.2"
},
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4 changes: 2 additions & 2 deletions packages/start-server-core/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -82,13 +82,13 @@
"@tanstack/router-core": "workspace:*",
"@tanstack/start-client-core": "workspace:*",
"@tanstack/start-storage-context": "workspace:*",
"h3-v2": "npm:h3@2.0.1-rc.16",
"h3": "2.0.1-rc.19",
"seroval": "^1.4.2"
},
"devDependencies": {
"@standard-schema/spec": "^1.0.0",
"@tanstack/intent": "^0.0.14",
"cookie-es": "^2.0.0",
"cookie-es": "^3.0.0",
"fetchdts": "^0.1.6",
"vite": "*",
"@types/node": ">=20"
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20 changes: 15 additions & 5 deletions packages/start-server-core/src/request-response.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ import {
unsealSession as h3_unsealSession,
updateSession as h3_updateSession,
useSession as h3_useSession,
} from 'h3-v2'
} from 'h3'
import type {
RequestHeaderMap,
RequestHeaderName,
Expand Down Expand Up @@ -147,8 +147,7 @@ export function getRequest(): Request {
}

export function getRequestHeaders(): TypedHeaders<RequestHeaderMap> {
// TODO `as any` not needed when fetchdts is updated
return getH3Event().req.headers as any
return getH3Event().req.headers
}

export function getRequestHeader(name: RequestHeaderName): string | undefined {
Expand Down Expand Up @@ -284,7 +283,16 @@ export function setResponseStatus(code?: number, text?: string): void {
*/
export function getCookies(): Record<string, string> {
const event = getH3Event()
return h3_parseCookies(event)
const cookies = h3_parseCookies(event)
const normalizedCookies: Record<string, string> = Object.create(null)

for (const [name, value] of Object.entries(cookies)) {
if (value !== undefined) {
normalizedCookies[name] = value
}
}

return normalizedCookies
}

/**
Expand All @@ -296,7 +304,9 @@ export function getCookies(): Record<string, string> {
* ```
*/
export function getCookie(name: string): string | undefined {
return getCookies()[name] || undefined
const event = getH3Event()
const cookies = h3_parseCookies(event)
return cookies[name] || undefined
Comment on lines +307 to +309
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@coderabbitai coderabbitai bot Mar 26, 2026

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⚠️ Potential issue | 🟡 Minor

🧩 Analysis chain

🏁 Script executed:

# Check the file exists and view lines 307-309
wc -l packages/start-server-core/src/request-response.ts
sed -n '305,315p' packages/start-server-core/src/request-response.ts

Repository: TanStack/router

Length of output: 407

🏁 Script executed:

# Let's also look for the getCookie function definition and context
sed -n '305,320p' packages/start-server-core/src/request-response.ts

Repository: TanStack/router

Length of output: 493

🏁 Script executed:

# Search for where h3_parseCookies is imported from
rg "h3_parseCookies" packages/start-server-core/src/request-response.ts -B 5 -A 5

Repository: TanStack/router

Length of output: 1108

🏁 Script executed:

# Check package.json to find h3 version
rg '"h3"' packages/start-server-core/package.json

Repository: TanStack/router

Length of output: 83

🏁 Script executed:

# Search for any tests or usage examples of getCookie with empty values
rg "getCookie" packages/start-server-core --type ts -A 3 -B 1 | head -50

Repository: TanStack/router

Length of output: 1351

🏁 Script executed:

# Check if there are any comments or documentation about cookie behavior
rg "cookie" packages/start-server-core/src/request-response.ts -i -B 2 -A 2

Repository: TanStack/router

Length of output: 3291

🏁 Script executed:

# Search for tests related to getCookie function
find packages/start-server-core -name "*.test.*" -o -name "*.spec.*" | xargs rg "getCookie|cookie" 2>/dev/null | head -30

Repository: TanStack/router

Length of output: 41

🏁 Script executed:

# Check if there's any TypeScript type definition or JSDoc for parseCookies
rg "parseCookies" --type ts -B 5 -A 10 | head -50

Repository: TanStack/router

Length of output: 3939

🌐 Web query:

h3 parseCookies TypeScript return type empty string values

💡 Result:

In the h3 library (unjs/h3), the parseCookies(event) utility parses the Cookie header from the request and returns a Record<string, string> (object mapping cookie names to their values as strings). Cookie values are always strings, including empty strings ("") if the cookie was set with an empty value (e.g., name=; Path=/). This is standard behavior for Cookie header parsing using libraries like cookie (jshttp/cookie), which h3 relies on internally. TypeScript treats Record<string, string> as all values being non-nullable strings, so empty string values are fully compatible—no type errors occur. If no cookies are present, it returns {} (empty object), which is also valid. Examples from h3 docs and source: - parseCookies(event) → { cookieName: "cookieValue" } or { cookieName: "" } - getCookie(event, name) → string | undefined (wrapper around parseCookies) No issues or bugs reported specifically about empty string values in TypeScript context. If experiencing type mismatches, ensure proper typing: const cookies: Record<string, string> = parseCookies(event);. For source confirmation, early h3 versions used parse(req.headers.cookie || '') from 'cookie', returning Record<string, string>. Current versions maintain this signature per docs and utils pages.

Citations:

Preserve empty cookie values in getCookie().

Line 309 uses || undefined, which converts valid empty cookie values ('') into undefined. This loses information about whether a cookie was explicitly set to an empty value versus not being set at all. Return the indexed value directly to preserve this distinction.

Suggested fix 
 export function getCookie(name: string): string | undefined {
   const event = getH3Event()
   const cookies = h3_parseCookies(event)
-  return cookies[name] || undefined
+  return cookies[name]
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
const event = getH3Event()
const cookies = h3_parseCookies(event)
return cookies[name] || undefined
export function getCookie(name: string): string | undefined {
const event = getH3Event()
const cookies = h3_parseCookies(event)
return cookies[name]
}
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@packages/start-server-core/src/request-response.ts` around lines 307 - 309,
The getCookie implementation is converting empty-string cookie values to
undefined by using "cookies[name] || undefined"; update getCookie to return the
indexed value directly (i.e., return cookies[name]) so that explicit empty
values are preserved; locate the getCookie function where getH3Event() and
h3_parseCookies(event) are used and remove the "|| undefined" fallback.

}

/**
Expand Down
48 changes: 41 additions & 7 deletions pnpm-lock.yaml
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