mirror of
https://github.com/oven-sh/bun
synced 2026-02-13 12:29:07 +00:00
248 lines
6.3 KiB
Markdown
248 lines
6.3 KiB
Markdown
As of Bun v1.1.44, we've added initial support for bundling frontend apps directly in Bun's HTTP server: `Bun.serve()`. Run your frontend and backend in the same app with no extra steps.
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To get started, import your HTML files and pass them to the `static` option in `Bun.serve()`.
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```ts
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import dashboard from "./dashboard.html";
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import homepage from "./index.html";
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Bun.serve({
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// Add HTML imports to `static`
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static: {
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// Bundle & route index.html to "/"
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"/": homepage,
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// Bundle & route dashboard.html to "/dashboard"
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"/dashboard": dashboard,
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},
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// Enable development mode for:
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// - Detailed error messages
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// - Rebuild on request
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development: true,
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// Handle API requests
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async fetch(req) {
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// ...your API code
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if (req.url.endsWith("/api/users")) {
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const users = await Bun.sql`SELECT * FROM users`;
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return Response.json(users);
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}
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// Return 404 for unmatched routes
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return new Response("Not Found", { status: 404 });
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},
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});
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```
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You'll need to run your app with `bun --experimental-html` to enable this feature:
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```bash
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$ bun --experimental-html run app.ts
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```
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## HTML imports are routes
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The web starts with HTML, and so does Bun's fullstack dev server.
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To specify entrypoints to your frontend, import HTML files into your JavaScript/TypeScript/TSX/JSX files.
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```ts
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import dashboard from "./dashboard.html";
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import homepage from "./index.html";
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```
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These HTML files are used as routes in Bun's dev server you can pass to `Bun.serve()`.
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```ts
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Bun.serve({
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static: {
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"/": homepage,
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"/dashboard": dashboard,
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}
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fetch(req) {
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// ... api requests
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},
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});
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```
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When you make a request to `/dashboard` or `/`, Bun automatically bundles the `<script>` and `<link>` tags in the HTML files, exposes them as static routes, and serves the result.
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An index.html file like this:
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```html#index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Home</title>
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<link rel="stylesheet" href="./reset.css" />
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<link rel="stylesheet" href="./styles.css" />
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="./sentry-and-preloads.ts"></script>
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<script type="module" src="./my-app.tsx"></script>
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</body>
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</html>
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```
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Becomes something like this:
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```html#index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Home</title>
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<link rel="stylesheet" href="/index-[hash].css" />
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/index-[hash].js"></script>
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</body>
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</html>
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```
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### How to use with React
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To use React in your client-side code, import `react-dom/client` and render your app.
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{% codetabs %}
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```ts#src/backend.ts
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import dashboard from "./public/dashboard.html";
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import { serve } from "bun";
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serve({
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static: {
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"/": dashboard,
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},
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async fetch(req) {
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// ...api requests
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return new Response("hello world");
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},
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});
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```
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```ts#src/frontend.tsx
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import "./styles.css";
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import { createRoot } from "react-dom/client";
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import { App } from "./app.tsx";
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document.addEventListener("DOMContentLoaded", () => {
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const root = createRoot(document.getElementById("root"));
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root.render(<App />);
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});
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```
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```html#public/dashboard.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Dashboard</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="../src/frontend.tsx"></script>
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</body>
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</html>
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```
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```css#src/styles.css
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body {
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background-color: red;
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}
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```
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```tsx#src/app.tsx
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export function App() {
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return <div>Hello World</div>;
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}
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```
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{% /codetabs %}
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### Development mode
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When building locally, enable development mode by setting `development: true` in `Bun.serve()`.
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```js-diff
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import homepage from "./index.html";
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import dashboard from "./dashboard.html";
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Bun.serve({
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static: {
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"/": homepage,
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"/dashboard": dashboard,
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}
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+ development: true,
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fetch(req) {
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// ... api requests
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},
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});
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```
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When `development` is `true`, Bun will:
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- Include the `SourceMap` header in the response so that devtools can show the original source code
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- Disable minification
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- Re-bundle assets on each request to a .html file
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#### Production mode
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When serving your app in production, set `development: false` in `Bun.serve()`.
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- Enable in-memory caching of bundled assets. Bun will bundle assets lazily on the first request to an `.html` file, and cache the result in memory until the server restarts.
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- Enables `Cache-Control` headers and `ETag` headers
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- Minifies JavaScript/TypeScript/TSX/JSX files
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## How this works
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Bun uses [`HTMLRewriter`](/docs/api/html-rewriter) to scan for `<script>` and `<link>` tags in HTML files, uses them as entrypoints for [Bun's bundler](/docs/bundler), generates an optimized bundle for the JavaScript/TypeScript/TSX/JSX and CSS files, and serves the result.
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1. **`<script>` processing**
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- Transpiles TypeScript, JSX, and TSX in `<script>` tags
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- Bundles imported dependencies
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- Generates sourcemaps for debugging
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- Minifies when `development` is not `true` in `Bun.serve()`
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```html
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<script type="module" src="./counter.tsx"></script>
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```
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2. **`<link>` processing**
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- Processes CSS imports and `<link>` tags
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- Concatenates CSS files
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- Rewrites `url` and asset paths to include content-addressable hashes in URLs
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```html
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<link rel="stylesheet" href="./styles.css" />
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```
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3. **`<img>` & asset processing**
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- Links to assets are rewritten to include content-addressable hashes in URLs
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- Small assets in CSS files are inlined into `data:` URLs, reducing the total number of HTTP requests sent over the wire
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4. **Rewrite HTML**
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- Combines all `<script>` tags into a single `<script>` tag with a content-addressable hash in the URL
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- Combines all `<link>` tags into a single `<link>` tag with a content-addressable hash in the URL
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- Outputs a new HTML file
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5. **Serve**
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- All the output files from the bundler are exposed as static routes, using the same mechanism internally as when you pass a `Response` object to [`static` in `Bun.serve()`](/docs/api/http#static-routes).
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This works similarly to how [`Bun.build` processes HTML files](/docs/bundler/html).
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## This is a work in progress
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- Client-side hot reloading isn't wired up yet. It will be in the future.
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- This doesn't support `bun build` yet. It also will in the future.
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- We haven't figured out plugins yet. This probably will live in `bunfig.toml` with the same API as in `Bun.build` otherwise.
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