diff --git a/README.md b/README.md
index a261408..16ea278 100644
--- a/README.md
+++ b/README.md
@@ -180,6 +180,35 @@ const { text, status } = useStream(
 );
 ```
 
+### Svelte (beta)
+
+Svelte 5 bindings are community-supported and in beta. They need `svelte` and
+[`convex-svelte`](https://github.com/get-convex/convex-svelte), with
+`setupConvex` called in a parent component. Reactive inputs are passed as
+getters. See [`example-svelte/`](./example-svelte/) for the chat app.
+
+```svelte
+<script lang="ts">
+  import { useStream } from "@convex-dev/persistent-text-streaming/svelte";
+
+  let { chat, driven }: { chat: Doc<"chats">; driven: boolean } = $props();
+
+  const stream = useStream(
+    api.chat.getChatBody,
+    new URL(`${convexSiteUrl}/chat-stream`),
+    () => driven,
+    () => chat.streamId as StreamId,
+    // Optional, read when a stream starts:
+    // () => ({ authToken, headers }),
+  );
+</script>
+
+<p>{stream.text}</p>
+```
+
+`stream.text` and `stream.status` update as the stream progresses. The HTTP
+request only starts in the browser, never during server-side rendering.
+
 ## Design Philosophy
 
 This component balances HTTP streaming with database persistence to try to
diff --git a/example-svelte/README.md b/example-svelte/README.md
new file mode 100644
index 0000000..3ddf677
--- /dev/null
+++ b/example-svelte/README.md
@@ -0,0 +1,18 @@
+# Svelte Chat Example App
+
+The chat app from [`example/`](../example/) built with Svelte 5 and the
+`@convex-dev/persistent-text-streaming/svelte` bindings. It shares the Convex
+backend in `example/convex` and the dependencies in the root `package.json`.
+
+## Running the app
+
+From the repository root:
+
+```bash
+npm install
+npm run dev # in one terminal
+npm run dev:svelte # in another terminal
+```
+
+Set `OPENAI_API_KEY` as described in the
+[React example's README](../example/README.md#establishing-your-openai_api_key).
diff --git a/example-svelte/index.html b/example-svelte/index.html
new file mode 100644
index 0000000..9fa6600
--- /dev/null
+++ b/example-svelte/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Convex Chat Example (Svelte)</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
+
diff --git a/example-svelte/src/App.svelte b/example-svelte/src/App.svelte
new file mode 100644
index 0000000..67b1188
--- /dev/null
+++ b/example-svelte/src/App.svelte
@@ -0,0 +1,12 @@
+<script lang="ts">
+  import { setupConvex } from "convex-svelte";
+  import ChatWindow from "./components/ChatWindow.svelte";
+
+  const convexUrl = import.meta.env.VITE_CONVEX_URL;
+  setupConvex(convexUrl);
+</script>
+
+<main class="flex min-h-screen flex-col">
+  <ChatWindow />
+</main>
+
diff --git a/example-svelte/src/app.css b/example-svelte/src/app.css
new file mode 100644
index 0000000..ab3e8d2
--- /dev/null
+++ b/example-svelte/src/app.css
@@ -0,0 +1,17 @@
+@import "tailwindcss";
+
+:root {
+  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
diff --git a/example-svelte/src/components/ChatWindow.svelte b/example-svelte/src/components/ChatWindow.svelte
new file mode 100644
index 0000000..69b13b5
--- /dev/null
+++ b/example-svelte/src/components/ChatWindow.svelte
@@ -0,0 +1,129 @@
+<script lang="ts">
+  import { useQuery, useConvexClient } from "convex-svelte";
+  import { SvelteSet } from "svelte/reactivity";
+  import MessageItem from "./MessageItem.svelte";
+  import ServerMessage from "./ServerMessage.svelte";
+  import { api } from "../../../example/convex/_generated/api";
+  import type { Id } from "../../../example/convex/_generated/dataModel";
+
+  const client = useConvexClient();
+  const messages = useQuery(api.messages.listMessages, () => ({}));
+
+  // Messages this session sent, so only their streams are driven over HTTP.
+  const drivenIds = new SvelteSet<string>();
+  let isStreaming = $state(false);
+  let inputValue = $state("");
+  let messagesEndRef = $state<HTMLDivElement | null>(null);
+  let inputRef = $state<HTMLInputElement | null>(null);
+
+  function focusInput() {
+    inputRef?.focus();
+  }
+
+  function scrollToBottom(behavior: ScrollBehavior = "smooth") {
+    messagesEndRef?.scrollIntoView({ behavior });
+  }
+
+  // Scroll to bottom when window resizes
+  $effect(() => {
+    function handleResize() {
+      scrollToBottom();
+    }
+    window.addEventListener("resize", handleResize);
+    return () => window.removeEventListener("resize", handleResize);
+  });
+
+  async function handleSubmit(e: SubmitEvent) {
+    e.preventDefault();
+    if (!inputValue.trim()) return;
+
+    const prompt = inputValue;
+    inputValue = "";
+
+    const chatId: Id<"userMessages"> = await client.mutation(
+      api.messages.sendMessage,
+      { prompt },
+    );
+
+    drivenIds.add(chatId);
+    isStreaming = true;
+  }
+
+  async function clearAllMessages() {
+    await client.mutation(api.messages.clearMessages, {});
+    inputValue = "";
+    isStreaming = false;
+    focusInput();
+  }
+
+  function stopStreaming() {
+    isStreaming = false;
+    focusInput();
+  }
+</script>
+
+<div class="flex-1 flex flex-col h-full bg-white">
+  <div class="flex-1 overflow-y-auto py-6 px-4 md:px-8 lg:px-12">
+    <div class="w-full max-w-5xl mx-auto space-y-6">
+      {#if messages.isLoading}
+        <div class="text-center text-gray-500">Loading messages...</div>
+      {:else if messages.error}
+        <div class="text-center text-red-500">
+          Error loading messages: {messages.error.message}
+        </div>
+      {:else if messages.data && messages.data.length === 0}
+        <div class="text-center text-gray-500">
+          No messages yet. Start the conversation!
+        </div>
+      {:else if messages.data}
+        {#each messages.data as message (message._id)}
+          <MessageItem {message} isUser={true}>
+            {message.prompt}
+          </MessageItem>
+          <MessageItem {message} isUser={false}>
+            <ServerMessage
+              {message}
+              isDriven={drivenIds.has(message._id)}
+              {stopStreaming}
+              {scrollToBottom}
+            />
+          </MessageItem>
+        {/each}
+      {/if}
+      <div bind:this={messagesEndRef}></div>
+    </div>
+  </div>
+
+  <div class="border-t border-gray-200 py-6 px-4 md:px-8 lg:px-12">
+    <form onsubmit={handleSubmit} class="w-full max-w-5xl mx-auto">
+      <div class="flex items-center gap-3">
+        <input
+          bind:this={inputRef}
+          bind:value={inputValue}
+          placeholder="Type your message..."
+          disabled={isStreaming}
+          class="flex-1 p-4 border border-gray-300 rounded-lg focus:border-blue-500 focus:ring-1 focus:ring-blue-500 outline-none text-base text-black"
+        />
+        <button
+          type="submit"
+          disabled={!inputValue.trim() || isStreaming}
+          class="px-8 py-4 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors disabled:bg-gray-400 disabled:text-gray-200 font-medium"
+        >
+          Send
+        </button>
+        <button
+          type="button"
+          disabled={!messages.data || messages.data.length < 2 || isStreaming}
+          onclick={clearAllMessages}
+          class="px-8 py-4 bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors disabled:bg-gray-400 disabled:text-gray-200 font-medium"
+        >
+          Clear Chat
+        </button>
+      </div>
+      {#if isStreaming}
+        <div class="text-xs text-gray-500 mt-2">AI is responding...</div>
+      {/if}
+    </form>
+  </div>
+</div>
+
diff --git a/example-svelte/src/components/MessageItem.svelte b/example-svelte/src/components/MessageItem.svelte
new file mode 100644
index 0000000..b6b47a3
--- /dev/null
+++ b/example-svelte/src/components/MessageItem.svelte
@@ -0,0 +1,53 @@
+<script lang="ts">
+  import type { Doc } from "../../../example/convex/_generated/dataModel";
+  import type { Snippet } from "svelte";
+
+  let {
+    message,
+    isUser,
+    children,
+  }: {
+    message: Doc<"userMessages">;
+    isUser: boolean;
+    children: Snippet;
+  } = $props();
+
+  const formattedDate = $derived(
+    new Date(message._creationTime).toLocaleDateString(),
+  );
+  const formattedTime = $derived(
+    new Date(message._creationTime).toLocaleTimeString(),
+  );
+</script>
+
+{#if isUser}
+  <div class="flex items-center gap-4 my-4">
+    <div class="flex-1 h-px bg-gray-200"></div>
+    <div class="text-sm text-gray-500">
+      {formattedDate}
+      {formattedTime}
+    </div>
+    <div class="flex-1 h-px bg-gray-200"></div>
+  </div>
+{/if}
+
+<div class="flex gap-4 {isUser ? 'justify-end' : 'justify-start'}">
+  <div class="flex gap-4 max-w-[95%] md:max-w-[85%] {isUser && 'flex-row-reverse'}">
+    <div
+      class="flex h-10 w-10 shrink-0 items-center justify-center rounded-full {isUser
+        ? 'bg-blue-600 text-white'
+        : 'bg-gray-300 text-gray-700'} font-medium text-sm"
+    >
+      {isUser ? "U" : "AI"}
+    </div>
+
+    <div
+      class="rounded-lg px-5 py-4 text-base {isUser
+        ? 'bg-blue-600 text-white'
+        : 'bg-gray-100 border border-gray-200 text-gray-900'}"
+    >
+      {@render children()}
+    </div>
+  </div>
+</div>
+
diff --git a/example-svelte/src/components/ServerMessage.svelte b/example-svelte/src/components/ServerMessage.svelte
new file mode 100644
index 0000000..3010810
--- /dev/null
+++ b/example-svelte/src/components/ServerMessage.svelte
@@ -0,0 +1,57 @@
+<script lang="ts">
+  import { getConvexSiteUrl, safeHref } from "@/lib/utils";
+  import type { StreamId } from "@convex-dev/persistent-text-streaming";
+  import { useStream } from "@convex-dev/persistent-text-streaming/svelte";
+  import { api } from "../../../example/convex/_generated/api";
+  import type { Doc } from "../../../example/convex/_generated/dataModel";
+  import type { HTMLAnchorAttributes } from "svelte/elements";
+  import Markdown from "svelte-exmarkdown";
+
+  let {
+    message,
+    isDriven,
+    stopStreaming,
+    scrollToBottom,
+  }: {
+    message: Doc<"userMessages">;
+    isDriven: boolean;
+    stopStreaming: () => void;
+    scrollToBottom: () => void;
+  } = $props();
+
+  const stream = useStream(
+    api.streaming.getStreamBody,
+    new URL(`${getConvexSiteUrl()}/chat-stream`),
+    () => isDriven,
+    () => message.responseStreamId as StreamId,
+  );
+
+  const isCurrentlyStreaming = $derived(
+    isDriven && (stream.status === "pending" || stream.status === "streaming"),
+  );
+
+  $effect(() => {
+    if (!isDriven) return;
+    if (isCurrentlyStreaming) return;
+    stopStreaming();
+  });
+
+  $effect(() => {
+    if (!stream.text) return;
+    scrollToBottom();
+  });
+</script>
+
+<div class="md-answer">
+  <!-- Raw HTML in the model output renders as text, like react-markdown. -->
+  <Markdown md={stream.text || "Thinking..."}>
+    {#snippet a({ href, children, ...rest }: HTMLAnchorAttributes)}
+      <a {...rest} href={href ? safeHref(href) : undefined}>
+        {@render children?.()}
+      </a>
+    {/snippet}
+  </Markdown>
+  {#if stream.status === "error"}
+    <div class="text-red-500 mt-2">Error loading response</div>
+  {/if}
+</div>
diff --git a/example-svelte/src/lib/utils.ts b/example-svelte/src/lib/utils.ts
new file mode 100644
index 0000000..8a5e888
--- /dev/null
+++ b/example-svelte/src/lib/utils.ts
@@ -0,0 +1,22 @@
+// Keeps relative, http(s), and mailto links and drops every other scheme,
+// such as `javascript:`. Similar to react-markdown's default URL transform,
+// which also allows a few more schemes and applies to images too.
+export function safeHref(href: string) {
+  const scheme = /^([^:/?#]+):/.exec(href)?.[1];
+  return !scheme || /^(https?|mailto)$/i.test(scheme) ? href : undefined;
+}
+
+export function getConvexSiteUrl() {
+  let convexSiteUrl;
+  if (import.meta.env.VITE_CONVEX_URL.includes(".cloud")) {
+    convexSiteUrl = import.meta.env.VITE_CONVEX_URL.replace(
+      /\.cloud$/,
+      ".site",
+    );
+  } else {
+    const url = new URL(import.meta.env.VITE_CONVEX_URL);
+    url.port = String(Number(url.port) + 1);
+    convexSiteUrl = url.toString();
+  }
+  return convexSiteUrl;
+}
diff --git a/example-svelte/src/main.ts b/example-svelte/src/main.ts
new file mode 100644
index 0000000..e8ddb4c
--- /dev/null
+++ b/example-svelte/src/main.ts
@@ -0,0 +1,10 @@
+import App from "./App.svelte";
+import "./app.css";
+import { mount } from "svelte";
+
+const app = mount(App, {
+  target: document.getElementById("app")!,
+});
+
+export default app;
+
diff --git a/example-svelte/src/vite-env.d.ts b/example-svelte/src/vite-env.d.ts
new file mode 100644
index 0000000..f3c063b
--- /dev/null
+++ b/example-svelte/src/vite-env.d.ts
@@ -0,0 +1,11 @@
+/// <reference types="svelte" />
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_CONVEX_URL: string;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}
+
diff --git a/example-svelte/tsconfig.json b/example-svelte/tsconfig.json
new file mode 100644
index 0000000..09c3404
--- /dev/null
+++ b/example-svelte/tsconfig.json
@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "lib": ["DOM", "DOM.Iterable", "ESNext"],
+    "skipLibCheck": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    },
+    "noEmit": true
+  },
+  "include": ["./src", "vite.config.ts"]
+}
diff --git a/example-svelte/vite.config.ts b/example-svelte/vite.config.ts
new file mode 100644
index 0000000..f675023
--- /dev/null
+++ b/example-svelte/vite.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from "vite";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+import tailwindcss from "@tailwindcss/vite";
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  envDir: "../",
+  plugins: [svelte(), tailwindcss()],
+  resolve: {
+    alias: {
+      "@": "/src",
+    },
+  },
+});
diff --git a/package-lock.json b/package-lock.json
index 77eb86c..bd30251 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "@edge-runtime/vm": "5.0.0",
         "@eslint/eslintrc": "3.3.5",
         "@eslint/js": "9.39.4",
+        "@sveltejs/vite-plugin-svelte": "7.3.1",
         "@tailwindcss/vite": "4.2.2",
         "@types/node": "22.20.1",
         "@types/react": "19.2.14",
@@ -21,17 +22,22 @@
         "chokidar-cli": "3.0.0",
         "clsx": "2.1.1",
         "convex": "1.46.0",
+        "convex-svelte": "0.14.0",
         "convex-test": "0.0.64",
         "eslint": "9.39.4",
         "eslint-plugin-react-hooks": "7.0.1",
         "eslint-plugin-react-refresh": "0.5.2",
         "globals": "17.5.0",
+        "happy-dom": "20.14.5",
         "openai": "7.0.0",
         "pkg-pr-new": "0.0.66",
         "prettier": "3.8.3",
         "react": "19.2.5",
         "react-dom": "19.2.5",
         "react-markdown": "10.1.0",
+        "svelte": "5.57.2",
+        "svelte-check": "4.7.6",
+        "svelte-exmarkdown": "5.0.2",
         "tailwind-merge": "3.5.0",
         "tailwindcss": "4.2.2",
         "typescript": "5.9.3",
@@ -41,8 +47,24 @@
       },
       "peerDependencies": {
         "convex": "^1.32.0",
+        "convex-svelte": ">=0.0.12 <0.16.0",
         "react": "~18.3.1 || ^19.0.0",
-        "react-dom": "~18.3.1 || ^19.0.0"
+        "react-dom": "~18.3.1 || ^19.0.0",
+        "svelte": "^5.0.0"
+      },
+      "peerDependenciesMeta": {
+        "convex-svelte": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        },
+        "svelte": {
+          "optional": true
+        }
       }
     },
     "node_modules/@actions/core": {
@@ -668,9 +690,9 @@
       }
     },
     "node_modules/@jridgewell/sourcemap-codec": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
-      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
+      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
       "dev": true,
       "license": "MIT"
     },
@@ -1273,6 +1295,56 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@sveltejs/acorn-typescript": {
+      "version": "1.0.13",
+      "resolved": "https://registry.npmjs.org/@sveltejs/acorn-typescript/-/acorn-typescript-1.0.13.tgz",
+      "integrity": "sha512-wgKggnhZVL9Bfx1OaKKTrYY9BFRk6C8UAkQNUcIv1+llzYrIqy+RZm5HPKzn0NpEBvTVhTqB4kQyllZywsRBRQ==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "acorn": "^8.9.0"
+      }
+    },
+    "node_modules/@sveltejs/load-config": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/@sveltejs/load-config/-/load-config-0.2.3.tgz",
+      "integrity": "sha512-VT3qmUb8pRV2QrZjd8iAmtg8lf4W0TIjZbvXtz5MKei/q96teWZgGJyyidJzOjzZzvdq616eSRVeMYIQChUTAQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18.0.0"
+      }
+    },
+    "node_modules/@sveltejs/vite-plugin-svelte": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@sveltejs/vite-plugin-svelte/-/vite-plugin-svelte-7.3.1.tgz",
+      "integrity": "sha512-ZPsLN8B1e/En+Ak5s4V7srFDT532oS0qieLsQwu63NGKsS+iAjoO2Js1BochlHlglcU+Pt7WAO3C5Ee+4f6gVA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "deepmerge": "^4.3.1",
+        "magic-string": "^1.0.0",
+        "obug": "^2.1.0",
+        "vitefu": "^1.1.2"
+      },
+      "engines": {
+        "node": "^20.19 || ^22.12 || >=24"
+      },
+      "peerDependencies": {
+        "svelte": "^5.46.4",
+        "vite": "^8.0.0-beta.7 || ^8.0.0"
+      }
+    },
+    "node_modules/@sveltejs/vite-plugin-svelte/node_modules/magic-string": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-1.4.3.tgz",
+      "integrity": "sha512-z12OxmaPGE0F4xlpGdjuAUckipLpQlTAuAmyGhNoD7ODpYUzvDfvtxUbjM/jwznyP178oju/KDdyi220wNJ0RQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.6.0"
+      }
+    },
     "node_modules/@tailwindcss/node": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.2.2.tgz",
@@ -1649,9 +1721,9 @@
       "license": "MIT"
     },
     "node_modules/@types/estree": {
-      "version": "1.0.8",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
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@@ -5109,6 +5623,16 @@
         "ufo": "^1.6.3"
       }
     },
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+      "resolved": "https://registry.npmjs.org/mri/-/mri-1.2.0.tgz",
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+      "license": "MIT",
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+      }
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       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -5607,6 +6131,25 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/remark-gfm": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/remark-gfm/-/remark-gfm-4.0.1.tgz",
+      "integrity": "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "mdast-util-gfm": "^3.0.0",
+        "micromark-extension-gfm": "^3.0.0",
+        "remark-parse": "^11.0.0",
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+        "unified": "^11.0.0"
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       "version": "11.0.0",
       "resolved": "https://registry.npmjs.org/remark-parse/-/remark-parse-11.0.0.tgz",
@@ -5642,6 +6185,22 @@
         "url": "https://opencollective.com/unified"
       }
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+    "node_modules/remark-stringify": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/remark-stringify/-/remark-stringify-11.0.0.tgz",
+      "integrity": "sha512-1OSmLd3awB/t8qdoEOMazZkNsfVTeY4fTsgzcQFdXNq8ToTN4ZGwrMnlda4K6smTFKD+GRV6O48i6Z4iKgPPpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "mdast-util-to-markdown": "^2.0.0",
+        "unified": "^11.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
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       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -5710,6 +6269,48 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/runed": {
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+      "resolved": "https://registry.npmjs.org/runed/-/runed-0.37.1.tgz",
+      "integrity": "sha512-MeFY73xBW8IueWBm012nNFIGy19WUGPLtknavyUPMpnyt350M47PhGSGrGoSLbidwn+Zlt/O0cp8/OZE3LASWA==",
+      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/huntabyte",
+        "https://github.com/sponsors/tglide"
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "dequal": "^2.0.3",
+        "esm-env": "^1.0.0",
+        "lz-string": "^1.5.0"
+      },
+      "peerDependencies": {
+        "@sveltejs/kit": "^2.21.0",
+        "svelte": "^5.7.0",
+        "zod": "^4.1.0"
+      },
+      "peerDependenciesMeta": {
+        "@sveltejs/kit": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/sade": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/sade/-/sade-1.8.1.tgz",
+      "integrity": "sha512-xal3CZX1Xlo/k4ApwCFrHVACi9fBqJ7V+mwhBsuf/1IOKbBy098Fex+Wa/5QMubw09pSZ/u8EY8PWgevJsXp1A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "mri": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/scheduler": {
       "version": "0.27.0",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
@@ -5911,6 +6512,104 @@
         "node": ">=8"
       }
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+    "node_modules/svelte": {
+      "version": "5.57.2",
+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.57.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@jridgewell/sourcemap-codec": "^1.6.0",
+        "@sveltejs/acorn-typescript": "^1.0.13",
+        "@types/estree": "^1.0.9",
+        "acorn": "^8.18.0",
+        "aria-query": "5.3.1",
+        "axobject-query": "^4.1.0",
+        "clsx": "^2.1.1",
+        "devalue": "^5.9.2",
+        "esm-env": "^1.2.1",
+        "esrap": "^2.3.6",
+        "is-reference": "^3.0.3",
+        "locate-character": "^3.0.0",
+        "magic-string": "^0.30.11",
+        "zimmerframe": "^1.1.2"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/svelte-check": {
+      "version": "4.7.6",
+      "resolved": "https://registry.npmjs.org/svelte-check/-/svelte-check-4.7.6.tgz",
+      "integrity": "sha512-t2scM//ZuVbSY/T2w6FSBw1v9s2NEmh/g+sy1lqtosW5ylBV5AF4wFb1Ts9Kf3MbfPDUDJDZ9L436YT0SPTdvw==",
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+        "@sveltejs/load-config": "^0.2.3",
+        "chokidar": "^4.0.1",
+        "fdir": "^6.2.0",
+        "picocolors": "^1.0.0",
+        "sade": "^1.7.4"
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+      "bin": {
+        "svelte-check": "bin/svelte-check"
+      },
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+    "node_modules/svelte-check/node_modules/chokidar": {
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+    "node_modules/svelte-check/node_modules/readdirp": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
+      "integrity": "sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14.18.0"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/svelte-exmarkdown": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/svelte-exmarkdown/-/svelte-exmarkdown-5.0.2.tgz",
+      "integrity": "sha512-/GhWbh0TBd7OPsL6IhQZm4BVuglP5MP4lVwBDnIF8IYfmHfwfY0z/nu78L8FDwJM2pP+DW8045g+jUhM357U1w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "remark-gfm": "^4.0.1",
+        "remark-parse": "^11.0.0",
+        "remark-rehype": "^11.1.2",
+        "unified": "^11.0.5"
+      },
+      "peerDependencies": {
+        "svelte": "^5.1.3"
+      }
+    },
     "node_modules/tailwind-merge": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/tailwind-merge/-/tailwind-merge-3.5.0.tgz",
@@ -6407,6 +7106,26 @@
         }
       }
     },
+    "node_modules/vitefu": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/vitefu/-/vitefu-1.1.3.tgz",
+      "integrity": "sha512-ub4okH7Z5KLjb6hDyjqrGXqWtWvoYdU3IGm/NorpgHncKoLTCfRIbvlhBm7r0YstIaQRYlp4yEbFqDcKSzXSSg==",
+      "dev": true,
+      "license": "MIT",
+      "workspaces": [
+        "tests/deps/*",
+        "tests/projects/*",
+        "tests/projects/workspace/packages/*"
+      ],
+      "peerDependencies": {
+        "vite": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "vite": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/vitest": {
       "version": "4.1.4",
       "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.4.tgz",
@@ -6497,6 +7216,16 @@
         }
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -6744,6 +7473,13 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/zimmerframe": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.5.tgz",
+      "integrity": "sha512-msJxIvYDYcoNL+PJsu+7qmpDWsYmAxTY+2TNYXXF0hzBzBk0BMecOqDOG/EckUoKCuKwObfbugIl8QpqHDXeFA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/zod": {
       "version": "4.1.12",
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.1.12.tgz",
diff --git a/package.json b/package.json
index 59e41d1..6869192 100644
--- a/package.json
+++ b/package.json
@@ -17,12 +17,13 @@
   "scripts": {
     "dev": "convex dev --start 'npm run dev:build'",
     "dev:frontend": "cd example && vite --clearScreen false",
+    "dev:svelte": "cd example-svelte && vite --clearScreen false",
     "dev:build": "chokidar 'tsconfig*.json' 'src/**/*.ts' -i '**/*.test.ts' -c 'npm run build:codegen' --initial",
     "predev": "convex init && npm run build:codegen",
     "build": "tsc --project ./tsconfig.build.json",
     "build:codegen": "npx convex codegen --component-dir ./src/component && npm run build",
     "build:clean": "rm -rf dist *.tsbuildinfo && npm run build:codegen",
-    "typecheck": "tsc --noEmit && tsc -p example && tsc -p example/convex",
+    "typecheck": "tsc --noEmit && tsc -p example && tsc -p example/convex && svelte-check --tsconfig example-svelte/tsconfig.json",
     "lint": "eslint .",
     "test": "vitest run --typecheck",
     "test:watch": "vitest --typecheck --clearScreen false",
@@ -47,6 +48,11 @@
       "types": "./dist/react/index.d.ts",
       "default": "./dist/react/index.js"
     },
+    "./svelte": {
+      "types": "./dist/svelte/index.svelte.d.ts",
+      "svelte": "./dist/svelte/index.svelte.js",
+      "default": "./dist/svelte/index.svelte.js"
+    },
     "./test": "./src/test.ts",
     "./_generated/component.js": {
       "types": "./dist/component/_generated/component.d.ts"
@@ -62,14 +68,31 @@
   },
   "peerDependencies": {
     "convex": "^1.32.0",
+    "convex-svelte": ">=0.0.12 <0.16.0",
     "react": "~18.3.1 || ^19.0.0",
-    "react-dom": "~18.3.1 || ^19.0.0"
+    "react-dom": "~18.3.1 || ^19.0.0",
+    "svelte": "^5.0.0"
+  },
+  "peerDependenciesMeta": {
+    "react": {
+      "optional": true
+    },
+    "react-dom": {
+      "optional": true
+    },
+    "svelte": {
+      "optional": true
+    },
+    "convex-svelte": {
+      "optional": true
+    }
   },
   "devDependencies": {
     "@convex-dev/eslint-plugin": "^5.0.0",
     "@edge-runtime/vm": "5.0.0",
     "@eslint/eslintrc": "3.3.5",
     "@eslint/js": "9.39.4",
+    "@sveltejs/vite-plugin-svelte": "7.3.1",
     "@tailwindcss/vite": "4.2.2",
     "@types/node": "22.20.1",
     "@types/react": "19.2.14",
@@ -78,17 +101,22 @@
     "chokidar-cli": "3.0.0",
     "clsx": "2.1.1",
     "convex": "1.46.0",
+    "convex-svelte": "0.14.0",
     "convex-test": "0.0.64",
     "eslint": "9.39.4",
     "eslint-plugin-react-hooks": "7.0.1",
     "eslint-plugin-react-refresh": "0.5.2",
     "globals": "17.5.0",
+    "happy-dom": "20.14.5",
     "openai": "7.0.0",
     "pkg-pr-new": "0.0.66",
     "prettier": "3.8.3",
     "react": "19.2.5",
     "react-dom": "19.2.5",
     "react-markdown": "10.1.0",
+    "svelte": "5.57.2",
+    "svelte-check": "4.7.6",
+    "svelte-exmarkdown": "5.0.2",
     "tailwind-merge": "3.5.0",
     "tailwindcss": "4.2.2",
     "typescript": "5.9.3",
diff --git a/src/svelte/index.svelte.test.ts b/src/svelte/index.svelte.test.ts
new file mode 100644
index 0000000..3bb83ec
--- /dev/null
+++ b/src/svelte/index.svelte.test.ts
@@ -0,0 +1,298 @@
+// @vitest-environment happy-dom
+// Effects only run in client builds, which a DOM environment selects.
+import { flushSync } from "svelte";
+import { SvelteMap } from "svelte/reactivity";
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
+import type { StreamBody, StreamId } from "../client/index.js";
+import { useStream } from "./index.svelte.js";
+
+// Stands in for the Convex subscription: a subscribed stream id returns the
+// body stored for it, and "skip" returns nothing. The map is reactive, so a
+// later write reaches the hook like a subscription update. The factory only
+// reads `persisted` when a test runs, after this module has initialized it.
+const persisted = new SvelteMap<string, StreamBody>();
+vi.mock("convex-svelte", () => ({
+  useQuery: (
+    _query: unknown,
+    getArgs: () => { streamId: string } | "skip",
+  ) => ({
+    get data() {
+      const args = getArgs();
+      return args === "skip" ? undefined : persisted.get(args.streamId);
+    },
+  }),
+}));
+
+const query = {} as Parameters<typeof useStream>[0];
+const url = new URL("https://example.convex.site/chat-stream");
+
+type FetchInit = {
+  body: string;
+  headers: Record<string, string>;
+  signal: AbortSignal;
+};
+type Options = { authToken: string; headers: Record<string, string> };
+const fetchMock = vi.fn<(url: URL, init: FetchInit) => Promise<Response>>();
+
+function controlledResponse() {
+  let controller!: ReadableStreamDefaultController<Uint8Array>;
+  const body = new ReadableStream<Uint8Array>({
+    start(c) {
+      controller = c;
+    },
+  });
+  return { response: new Response(body), controller };
+}
+
+function render(
+  initial: { driven: boolean; streamId?: string },
+  getOpts?: Parameters<typeof useStream>[4],
+) {
+  const props = $state(initial);
+  let stream!: Readonly<StreamBody>;
+  const destroy = $effect.root(() => {
+    stream = useStream(
+      query,
+      url,
+      () => props.driven,
+      () => props.streamId as StreamId | undefined,
+      getOpts,
+    );
+  });
+  flushSync();
+  return { props, stream, destroy };
+}
+
+const requestedIds = () =>
+  fetchMock.mock.calls.map(([, init]) => JSON.parse(init.body).streamId);
+
+let consoleError: ReturnType<typeof vi.spyOn>;
+
+beforeEach(() => {
+  persisted.clear();
+  fetchMock.mockReset();
+  vi.stubGlobal("fetch", fetchMock);
+  consoleError = vi.spyOn(console, "error").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+});
+
+describe("useStream (svelte)", () => {
+  test("decodes characters split across chunks", async () => {
+    const { response, controller } = controlledResponse();
+    fetchMock.mockResolvedValue(response);
+    const { stream, destroy } = render({ driven: true, streamId: "a" });
+
+    const bytes = new TextEncoder().encode("héllo 👋");
+    // Split inside "é" (2 bytes) and inside the emoji (4 bytes).
+    controller.enqueue(bytes.slice(0, 2));
+    controller.enqueue(bytes.slice(2, 9));
+    controller.enqueue(bytes.slice(9));
+    controller.close();
+
+    await vi.waitFor(() => expect(stream.status).toBe("done"));
+    expect(stream.text).toBe("héllo 👋");
+    destroy();
+  });
+
+  test("a new streamId resets the text and starts a new request", async () => {
+    const first = controlledResponse();
+    const second = controlledResponse();
+    fetchMock
+      .mockResolvedValueOnce(first.response)
+      .mockResolvedValueOnce(second.response);
+    const { props, stream, destroy } = render({ driven: true, streamId: "a" });
+
+    first.controller.enqueue(new TextEncoder().encode("first"));
+    await vi.waitFor(() => expect(stream.text).toBe("first"));
+
+    props.streamId = "b";
+    flushSync();
+    expect(stream).toMatchObject({ text: "", status: "pending" });
+    expect(requestedIds()).toEqual(["a", "b"]);
+    expect(fetchMock.mock.calls[0][1].signal.aborted).toBe(true);
+
+    second.controller.enqueue(new TextEncoder().encode("second"));
+    second.controller.close();
+    await vi.waitFor(() => expect(stream.status).toBe("done"));
+    expect(stream.text).toBe("second");
+    destroy();
+  });
+
+  test("an undefined streamId shows empty text and pending", async () => {
+    const { response, controller } = controlledResponse();
+    fetchMock.mockResolvedValue(response);
+    const { props, stream, destroy } = render({ driven: true, streamId: "a" });
+
+    controller.enqueue(new TextEncoder().encode("done text"));
+    controller.close();
+    await vi.waitFor(() => expect(stream.status).toBe("done"));
+
+    props.streamId = undefined;
+    flushSync();
+    expect(stream).toMatchObject({ text: "", status: "pending" });
+    destroy();
+  });
+
+  test("switching to a stream this session does not drive hides the last one", async () => {
+    const { response, controller } = controlledResponse();
+    fetchMock.mockResolvedValue(response);
+    const { props, stream, destroy } = render({ driven: true, streamId: "a" });
+
+    controller.enqueue(new TextEncoder().encode("done text"));
+    controller.close();
+    await vi.waitFor(() => expect(stream.status).toBe("done"));
+
+    props.driven = false;
+    props.streamId = "b";
+    flushSync();
+    expect(stream).toMatchObject({ text: "", status: "pending" });
+
+    persisted.set("b", { text: "from the database", status: "done" });
+    expect(stream).toMatchObject({ text: "from the database", status: "done" });
+    destroy();
+  });
+
+  test("does not restart when the getter re-runs with the same streamId", () => {
+    fetchMock.mockReturnValue(new Promise(() => {}));
+    const message = $state({ current: { streamId: "a" } });
+    const destroy = $effect.root(() => {
+      useStream(
+        query,
+        url,
+        () => true,
+        () => message.current.streamId as StreamId,
+      );
+    });
+    flushSync();
+
+    message.current = { streamId: "a" };
+    flushSync();
+
+    expect(requestedIds()).toEqual(["a"]);
+    expect(fetchMock.mock.calls[0][1].signal.aborted).toBe(false);
+    destroy();
+  });
+
+  test("teardown aborts the request without reporting an error", async () => {
+    // Like the real fetch, reject once the request is aborted.
+    fetchMock.mockImplementation(
+      (_url, init) =>
+        new Promise((_resolve, reject) => {
+          init.signal.addEventListener("abort", () =>
+            reject(new DOMException("Aborted", "AbortError")),
+          );
+        }),
+    );
+    const { stream, destroy } = render({ driven: true, streamId: "a" });
+
+    destroy();
+
+    expect(fetchMock.mock.calls[0][1].signal.aborted).toBe(true);
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    expect(stream.status).toBe("pending");
+    expect(consoleError).not.toHaveBeenCalled();
+  });
+
+  test("a response settling after a switch does not leak into the next stream", async () => {
+    fetchMock
+      .mockResolvedValueOnce(new Response(null, { status: 205 }))
+      .mockReturnValueOnce(new Promise(() => {}));
+    const { props, stream, destroy } = render({ driven: true, streamId: "a" });
+
+    // Switch before the first response's continuation runs.
+    props.streamId = "b";
+    flushSync();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(stream.status).toBe("pending");
+    destroy();
+  });
+
+  test("a rejected fetch falls back to the persisted body", async () => {
+    persisted.set("a", { text: "partial", status: "streaming" });
+    fetchMock.mockRejectedValue(new TypeError("Failed to fetch"));
+    const { stream, destroy } = render({ driven: true, streamId: "a" });
+
+    await vi.waitFor(() => expect(stream.text).toBe("partial"));
+    persisted.set("a", { text: "partial and more", status: "done" });
+    expect(stream).toMatchObject({ text: "partial and more", status: "done" });
+    destroy();
+  });
+
+  test("resuming a stream before its first chunk persists does not POST again", async () => {
+    // Like the real fetch, reject once the request is aborted.
+    fetchMock.mockImplementation(
+      (_url, init) =>
+        new Promise((_resolve, reject) => {
+          init.signal.addEventListener("abort", () =>
+            reject(new DOMException("Aborted", "AbortError")),
+          );
+        }),
+    );
+    persisted.set("a", { text: "", status: "pending" });
+    const { props, stream, destroy } = render({ driven: true, streamId: "a" });
+
+    props.driven = false;
+    flushSync();
+    props.driven = true;
+    flushSync();
+    persisted.set("a", { text: "first chunk", status: "streaming" });
+
+    expect(requestedIds()).toEqual(["a"]);
+    expect(stream).toMatchObject({ text: "first chunk", status: "streaming" });
+
+    // A new stream still streams over HTTP, and its request stays open.
+    const b = controlledResponse();
+    fetchMock.mockResolvedValueOnce(b.response);
+    props.streamId = "b";
+    flushSync();
+    expect(requestedIds()).toEqual(["a", "b"]);
+    expect(stream).toMatchObject({ text: "", status: "pending" });
+
+    b.controller.enqueue(new TextEncoder().encode("from http"));
+    await vi.waitFor(() =>
+      expect(stream).toMatchObject({ text: "from http", status: "streaming" }),
+    );
+    expect(fetchMock.mock.calls[1][1].signal.aborted).toBe(false);
+    destroy();
+  });
+
+  test.each([
+    ["the token", (o: Options) => (o.authToken = "new")],
+    ["a header", (o: Options) => (o.headers["X-Trace"] = "new")],
+  ])("changing %s does not restart the request", (_name, change) => {
+    fetchMock.mockReturnValue(new Promise(() => {}));
+    const options = $state<Options>({
+      authToken: "old",
+      headers: { "X-Trace": "old" },
+    });
+    const { destroy } = render({ driven: true, streamId: "a" }, () => options);
+
+    change(options);
+    flushSync();
+
+    expect(fetchMock).toHaveBeenCalledTimes(1);
+    expect(fetchMock.mock.calls[0][1].signal.aborted).toBe(false);
+    expect(fetchMock.mock.calls[0][1].headers).toMatchObject({
+      Authorization: "Bearer old",
+      "X-Trace": "old",
+    });
+    destroy();
+  });
+
+  test.each([205, 500])(
+    "a %i response falls back to the persisted body",
+    async (status) => {
+      persisted.set("a", { text: "from the database", status: "done" });
+      fetchMock.mockResolvedValue(new Response(null, { status }));
+      const { stream, destroy } = render({ driven: true, streamId: "a" });
+
+      await vi.waitFor(() => expect(stream.text).toBe("from the database"));
+      destroy();
+    },
+  );
+});
diff --git a/src/svelte/index.svelte.ts b/src/svelte/index.svelte.ts
new file mode 100644
index 0000000..003e70b
--- /dev/null
+++ b/src/svelte/index.svelte.ts
@@ -0,0 +1,186 @@
+/// Svelte helpers for persistent text streaming.
+import type { StreamStatus } from "../component/schema.js";
+import { useQuery } from "convex-svelte";
+import { untrack } from "svelte";
+import type { StreamBody, StreamId } from "../client/index.js";
+import type { FunctionReference } from "convex/server";
+
+/**
+ * Svelte 5 version of the React `useStream` hook. Call it while a component
+ * initializes. Reactive inputs are getters so Svelte can track them.
+ *
+ * @param getPersistentBody - A query function reference that returns the body
+ * of a stream using the component's `getStreamBody` method.
+ * @param streamUrl - The URL of the http action that will kick off the stream
+ * generation and stream the result back to the client using the component's
+ * `stream` method.
+ * @param getDriven - Returns whether this particular session is driving the
+ * stream. Return true if this is the client session that first created the
+ * stream using the component's `createStream` method. If you're simply
+ * reloading an existing stream, return false.
+ * @param getStreamId - Returns the ID of the stream. While it returns
+ * undefined, the text is empty and the status is `pending`.
+ * @param getOpts - Returns request options. They are read when a stream
+ * starts, so a changed auth token applies to the next stream without
+ * aborting the current one.
+ * @returns A reactive object with the `text` and `status` of the stream.
+ */
+export function useStream(
+  getPersistentBody: FunctionReference<
+    "query",
+    "public",
+    { streamId: string },
+    StreamBody
+  >,
+  streamUrl: URL,
+  getDriven: () => boolean,
+  getStreamId: () => StreamId | undefined,
+  getOpts?: () => {
+    // If provided, this will be passed as the Authorization header.
+    authToken?: string | null;
+    // If provided, these will be passed as additional headers.
+    headers?: Record<string, string>;
+  },
+): Readonly<StreamBody> {
+  let streamBody = $state("");
+  let streamEnded = $state<boolean | null>(null);
+  // Set when this session drives a stream it already requested once.
+  let resumed = $state(false);
+
+  // Every stream ID this hook has POSTed. Aborting a request does not stop
+  // the backend writer, so a second POST for the same ID could start a
+  // second writer on the same stream. Holds one entry per stream seen.
+  const attempted = new Set<StreamId>();
+
+  // Deriveds only notify dependents when their value changes, so the effect
+  // below never re-runs because a getter re-ran with the same id.
+  const driven = $derived(getDriven());
+  const streamId = $derived(getStreamId());
+
+  const usePersistence = $derived(
+    // Something is wrong with the stream, so we need to use the database value.
+    streamEnded === false ||
+      // The HTTP stream for this ID was already used, so only the database
+      // has the full text.
+      resumed ||
+      // If we're not driving the stream, we must use the database value.
+      !driven,
+  );
+
+  const persistentBody = useQuery(getPersistentBody, () =>
+    usePersistence && streamId ? { streamId } : "skip",
+  );
+
+  // Effects only run in the browser, so SSR never sends the request.
+  $effect(() => {
+    // Reset state from any previous stream, also when this one is missing or
+    // not driven, so the body never shows the last stream's text.
+    streamBody = "";
+    streamEnded = null;
+    if (!driven || !streamId) {
+      return;
+    }
+
+    // Branch on a local, not on `resumed`: reading the state here would make
+    // the effect re-run, and abort the new stream, when it resets to false.
+    const isResume = attempted.has(streamId);
+    resumed = isResume;
+    if (isResume) {
+      return;
+    }
+    attempted.add(streamId);
+
+    const controller = new AbortController();
+    // Read every option untracked: a changed token or header applies to the
+    // next stream and must not abort the current one.
+    const headers = untrack(() => {
+      const opts = getOpts?.();
+      return {
+        "Content-Type": "application/json",
+        ...opts?.headers,
+        ...(opts?.authToken
+          ? { Authorization: `Bearer ${opts.authToken}` }
+          : {}),
+      };
+    });
+
+    void (async () => {
+      try {
+        const response = await fetch(streamUrl, {
+          method: "POST",
+          body: JSON.stringify({ streamId }),
+          headers,
+          signal: controller.signal,
+        });
+        // A response that settled just before teardown must not write into
+        // the state of the next stream.
+        if (controller.signal.aborted) return;
+
+        if (response.status === 205) {
+          console.error("Stream already finished", response);
+          streamEnded = false;
+          return;
+        }
+        if (!response.ok) {
+          console.error("Failed to reach streaming endpoint", response);
+          streamEnded = false;
+          return;
+        }
+        if (!response.body) {
+          console.error("No body in response", response);
+          streamEnded = false;
+          return;
+        }
+
+        const reader = response.body.getReader();
+        // One decoder per stream keeps multi-byte characters intact when they
+        // are split across chunks.
+        const decoder = new TextDecoder();
+
+        for (;;) {
+          const { done, value } = await reader.read();
+          if (controller.signal.aborted) return;
+          const text = decoder.decode(value, { stream: !done });
+          if (text) {
+            streamBody += text;
+          }
+          if (done) {
+            streamEnded = true;
+            return;
+          }
+        }
+      } catch (e) {
+        if (!controller.signal.aborted) {
+          console.error("Error reading stream", e);
+          streamEnded = false;
+        }
+      }
+    })();
+
+    return () => {
+      controller.abort();
+    };
+  });
+
+  const body = $derived.by((): StreamBody => {
+    if (persistentBody.data) {
+      return persistentBody.data;
+    }
+    let status: StreamStatus;
+    if (streamEnded === null) {
+      status = streamBody.length > 0 ? "streaming" : "pending";
+    } else {
+      status = streamEnded ? "done" : "error";
+    }
+    return { text: streamBody, status };
+  });
+
+  return {
+    get text() {
+      return body.text;
+    },
+    get status() {
+      return body.status;
+    },
+  };
+}
diff --git a/vitest.config.js b/vitest.config.js
index e9408f8..af01f24 100644
--- a/vitest.config.js
+++ b/vitest.config.js
@@ -1,6 +1,12 @@
 import { defineConfig } from "vitest/config";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
 
 export default defineConfig({
+  // Compiles runes in `*.svelte.ts` modules; other files are untouched.
+  plugins: [svelte({ configFile: false })],
+  // Only affects tests in a DOM environment, so Svelte loads its client
+  // runtime there. Edge-runtime tests resolve with the SSR conditions.
+  resolve: { conditions: ["browser"] },
   test: {
     environment: "edge-runtime",
     typecheck: {