assistant-ui · AVGVSTVS96 · Dec 1, 2025
diff --git a/app/api/chat/route.ts b/app/api/chat/route.ts
@@ -1,9 +1,5 @@
 import { openai } from "@ai-sdk/openai";
-import {
-  streamText,
-  convertToModelMessages,
-  type UIMessage,
-} from "ai";
+import { streamText, convertToModelMessages, type UIMessage } from "ai";
 
 export async function POST(req: Request) {
   const { messages }: { messages: UIMessage[] } = await req.json();

diff --git a/biome.json b/biome.json
@@ -0,0 +1,153 @@
+{
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": false,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 80,
+    "lineEnding": "lf"
+  },
+  "assist": {
+    "enabled": false
+  },
+  "linter": {
+    "enabled": true,
+    "domains": {
+      "react": "all",
+      "next": "all"
+    },
+    "rules": {
+      "recommended": true,
+      "suspicious": {
+        "noExplicitAny": "off",
+        "noArrayIndexKey": "off",
+        "noEmptyInterface": "off",
+        "useIterableCallbackReturn": "off",
+        "noThenProperty": "off",
+        "noConfusingVoidType": "off",
+        "noImplicitAnyLet": "off",
+        "noAssignInExpressions": "off",
+        "noRedeclare": "off",
+        "noConfusingLabels": {
+          "level": "error",
+          "options": {
+            "allowedLabels": ["DEV"]
+          }
+        },
+        "noDoubleEquals": "off",
+        "noPrototypeBuiltins": "off",
+        "noDocumentCookie": "off"
+      },
+      "style": {
+        "noNamespace": "off",
+        "useImportType": "off",
+        "noNonNullAssertion": "off",
+        "useComponentExportOnlyModules": "off"
+      },
+      "correctness": {
+        "noUnusedVariables": {
+          "level": "warn",
+          "options": {
+            "ignoreRestSiblings": true
+          }
+        },
+        "useExhaustiveDependencies": "off",
+        "useHookAtTopLevel": "off",
+        "noSwitchDeclarations": "off",
+        "noUnsafeOptionalChaining": "off",
+        "useUniqueElementIds": "off"
+      },
+      "complexity": {
+        "noForEach": "off",
+        "noBannedTypes": "off",
+        "noUselessConstructor": "off",
+        "noStaticOnlyClass": "off",
+        "useArrowFunction": "off",
+        "noThisInStatic": "off",
+        "useFlatMap": "off",
+        "useLiteralKeys": "off"
+      },
+      "a11y": {
+        "useKeyWithClickEvents": "off",
+        "noSvgWithoutTitle": "off",
+        "noStaticElementInteractions": "off",
+        "useFocusableInteractive": "off",
+        "useButtonType": "off",
+        "useSemanticElements": "off"
+      },
+      "security": {
+        "noDangerouslySetInnerHtml": "off"
+      },
+      "performance": {
+        "noImgElement": "off"
+      },
+      "nursery": {
+        "useSortedClasses": {
+          "fix": "safe",
+          "level": "error",
+          "options": {
+            "attributes": ["className"],
+            "functions": ["clsx", "cva", "tw", "twMerge", "cn", "twJoin", "tv"]
+          }
+        }
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "enabled": true,
+      "quoteStyle": "double",
+      "jsxQuoteStyle": "double",
+      "quoteProperties": "asNeeded",
+      "trailingCommas": "all",
+      "semicolons": "always",
+      "arrowParentheses": "always",
+      "bracketSpacing": true,
+      "bracketSameLine": false,
+      "attributePosition": "auto"
+    },
+    "parser": {
+      "unsafeParameterDecoratorsEnabled": true
+    }
+  },
+  "json": {
+    "formatter": {
+      "enabled": true,
+      "trailingCommas": "none"
+    },
+    "parser": {
+      "allowComments": true,
+      "allowTrailingCommas": false
+    }
+  },
+  "css": {
+    "parser": {
+      "cssModules": false,
+      "tailwindDirectives": true
+    },
+    "formatter": {
+      "enabled": false
+    },
+    "linter": {
+      "enabled": false
+    }
+  },
+  "files": {
+    "includes": [
+      "**",
+      "!**/dist",
+      "!**/node_modules",
+      "!**/.next",
+      "!**/.vercel",
+      "!**/out",
+      "!**/.source",
+      "!**/next-env.d.ts"
+    ]
+  }
+}
diff --git a/components/assistant-ui/attachment.tsx b/components/assistant-ui/attachment.tsx
@@ -97,7 +97,7 @@ const AttachmentPreviewDialog: FC<PropsWithChildren> = ({ children }) => {
       >
         {children}
       </DialogTrigger>
-      <DialogContent className="aui-attachment-preview-dialog-content p-2 sm:max-w-3xl [&_svg]:text-background [&>button]:rounded-full [&>button]:bg-foreground/60 [&>button]:p-1 [&>button]:opacity-100 [&>button]:!ring-0 [&>button]:hover:[&_svg]:text-destructive">
+      <DialogContent className="aui-attachment-preview-dialog-content [&>button]:!ring-0 p-2 sm:max-w-3xl [&>button]:rounded-full [&>button]:bg-foreground/60 [&>button]:p-1 [&>button]:opacity-100 [&_svg]:text-background [&>button]:hover:[&_svg]:text-destructive">
         <DialogTitle className="aui-sr-only sr-only">
           Image Attachment Preview
         </DialogTitle>
@@ -190,7 +190,7 @@ const AttachmentRemove: FC = () => {
     <AttachmentPrimitive.Remove asChild>
       <TooltipIconButton
         tooltip="Remove file"
-        className="aui-attachment-tile-remove absolute top-1.5 right-1.5 size-3.5 rounded-full bg-white text-muted-foreground opacity-100 shadow-sm hover:!bg-white [&_svg]:text-black hover:[&_svg]:text-destructive"
+        className="aui-attachment-tile-remove hover:!bg-white absolute top-1.5 right-1.5 size-3.5 rounded-full bg-white text-muted-foreground opacity-100 shadow-sm [&_svg]:text-black hover:[&_svg]:text-destructive"
         side="top"
       >
         <XIcon className="aui-attachment-remove-icon size-3 dark:stroke-[2.5px]" />
@@ -225,7 +225,7 @@ export const ComposerAddAttachment: FC = () => {
         side="bottom"
         variant="ghost"
         size="icon"
-        className="aui-composer-add-attachment size-[34px] rounded-full p-1 text-xs font-semibold hover:bg-muted-foreground/15 dark:border-muted-foreground/15 dark:hover:bg-muted-foreground/30"
+        className="aui-composer-add-attachment size-[34px] rounded-full p-1 font-semibold text-xs hover:bg-muted-foreground/15 dark:border-muted-foreground/15 dark:hover:bg-muted-foreground/30"
         aria-label="Add Attachment"
       >
         <PlusIcon className="aui-attachment-add-icon size-5 stroke-[1.5px]" />

diff --git a/components/assistant-ui/markdown-text.tsx b/components/assistant-ui/markdown-text.tsx
@@ -35,7 +35,7 @@ const CodeHeader: FC<CodeHeaderProps> = ({ language, code }) => {
   };
 
   return (
-    <div className="aui-code-header-root mt-4 flex items-center justify-between gap-4 rounded-t-lg bg-muted-foreground/15 px-4 py-2 text-sm font-semibold text-foreground dark:bg-muted-foreground/20">
+    <div className="aui-code-header-root mt-4 flex items-center justify-between gap-4 rounded-t-lg bg-muted-foreground/15 px-4 py-2 font-semibold text-foreground text-sm dark:bg-muted-foreground/20">
       <span className="aui-code-header-language lowercase [&>span]:text-xs">
         {language}
       </span>
@@ -70,7 +70,7 @@ const defaultComponents = memoizeMarkdownComponents({
   h1: ({ className, ...props }) => (
     <h1
       className={cn(
-        "aui-md-h1 mb-8 scroll-m-20 text-4xl font-extrabold tracking-tight last:mb-0",
+        "aui-md-h1 mb-8 scroll-m-20 font-extrabold text-4xl tracking-tight last:mb-0",
         className,
       )}
       {...props}
@@ -79,7 +79,7 @@ const defaultComponents = memoizeMarkdownComponents({
   h2: ({ className, ...props }) => (
     <h2
       className={cn(
-        "aui-md-h2 mt-8 mb-4 scroll-m-20 text-3xl font-semibold tracking-tight first:mt-0 last:mb-0",
+        "aui-md-h2 mt-8 mb-4 scroll-m-20 font-semibold text-3xl tracking-tight first:mt-0 last:mb-0",
         className,
       )}
       {...props}
@@ -88,7 +88,7 @@ const defaultComponents = memoizeMarkdownComponents({
   h3: ({ className, ...props }) => (
     <h3
       className={cn(
-        "aui-md-h3 mt-6 mb-4 scroll-m-20 text-2xl font-semibold tracking-tight first:mt-0 last:mb-0",
+        "aui-md-h3 mt-6 mb-4 scroll-m-20 font-semibold text-2xl tracking-tight first:mt-0 last:mb-0",
         className,
       )}
       {...props}
@@ -97,7 +97,7 @@ const defaultComponents = memoizeMarkdownComponents({
   h4: ({ className, ...props }) => (
     <h4
       className={cn(
-        "aui-md-h4 mt-6 mb-4 scroll-m-20 text-xl font-semibold tracking-tight first:mt-0 last:mb-0",
+        "aui-md-h4 mt-6 mb-4 scroll-m-20 font-semibold text-xl tracking-tight first:mt-0 last:mb-0",
         className,
       )}
       {...props}
@@ -106,7 +106,7 @@ const defaultComponents = memoizeMarkdownComponents({
   h5: ({ className, ...props }) => (
     <h5
       className={cn(
-        "aui-md-h5 my-4 text-lg font-semibold first:mt-0 last:mb-0",
+        "aui-md-h5 my-4 font-semibold text-lg first:mt-0 last:mb-0",
         className,
       )}
       {...props}
@@ -205,7 +205,7 @@ const defaultComponents = memoizeMarkdownComponents({
   pre: ({ className, ...props }) => (
     <pre
       className={cn(
-        "aui-md-pre overflow-x-auto !rounded-t-none rounded-b-lg bg-black p-4 text-white",
+        "aui-md-pre !rounded-t-none overflow-x-auto rounded-b-lg bg-black p-4 text-white",
         className,
       )}
       {...props}

diff --git a/components/assistant-ui/reasoning.tsx b/components/assistant-ui/reasoning.tsx
@@ -80,7 +80,7 @@ const GradientFade: FC<{ className?: string }> = ({ className }) => (
     className={cn(
       "aui-reasoning-fade pointer-events-none absolute inset-x-0 bottom-0 z-10 h-16",
       "bg-[linear-gradient(to_top,var(--color-background),transparent)]",
-      "animate-in fade-in-0",
+      "fade-in-0 animate-in",
       "group-data-[state=open]/collapsible-content:animate-out",
       "group-data-[state=open]/collapsible-content:fade-out-0",
       "group-data-[state=open]/collapsible-content:delay-[calc(var(--animation-duration)*0.75)]", // calc for timing the delay
@@ -102,7 +102,7 @@ const ReasoningTrigger: FC<{ active: boolean; className?: string }> = ({
 }) => (
   <CollapsibleTrigger
     className={cn(
-      "aui-reasoning-trigger group/trigger -mb-2 flex max-w-[75%] items-center gap-2 py-2 text-sm text-muted-foreground transition-colors hover:text-foreground",
+      "aui-reasoning-trigger group/trigger -mb-2 flex max-w-[75%] items-center gap-2 py-2 text-muted-foreground text-sm transition-colors hover:text-foreground",
       className,
     )}
   >
@@ -147,7 +147,7 @@ const ReasoningContent: FC<
 > = ({ className, children, "aria-busy": ariaBusy }) => (
   <CollapsibleContent
     className={cn(
-      "aui-reasoning-content relative overflow-hidden text-sm text-muted-foreground outline-none",
+      "aui-reasoning-content relative overflow-hidden text-muted-foreground text-sm outline-none",
       "group/collapsible-content ease-out",
       "data-[state=closed]:animate-collapsible-up",
       "data-[state=open]:animate-collapsible-down",

diff --git a/components/assistant-ui/thread-list.tsx b/components/assistant-ui/thread-list.tsx
@@ -63,7 +63,7 @@ const ThreadListSkeleton: FC = () => {
 
 const ThreadListItem: FC = () => {
   return (
-    <ThreadListItemPrimitive.Root className="aui-thread-list-item flex items-center gap-2 rounded-lg transition-all hover:bg-muted focus-visible:bg-muted focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none data-active:bg-muted">
+    <ThreadListItemPrimitive.Root className="aui-thread-list-item flex items-center gap-2 rounded-lg transition-all hover:bg-muted focus-visible:bg-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring data-active:bg-muted">
       <ThreadListItemPrimitive.Trigger className="aui-thread-list-item-trigger flex-grow px-3 py-2 text-start">
         <ThreadListItemTitle />
       </ThreadListItemPrimitive.Trigger>