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‎docs/latest/advanced/vite.md‎

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@@ -85,6 +85,158 @@ changes to components, islands, and CSS are reflected in the browser instantly
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without a full page reload. This is powered by Prefresh, Preact's fast refresh
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implementation.
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## Migrating from the Builder to Vite
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If your Fresh 2 project was created with `--builder` (or predates the Vite
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plugin), it uses the legacy [`Builder`](/docs/advanced/builder) class wired up
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in `dev.ts`. Migrating to Vite is mostly a matter of swapping `dev.ts` for a
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`vite.config.ts`, moving CSS into the module graph, and updating `deno.json`.
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### 1. Update `deno.json`
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Add the Vite plugin and `vite` itself to your imports, drop the Builder-only
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Tailwind packages (if any), and point `compilerOptions.types` at Vite's client
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types so HMR and asset imports type-check:
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```diff deno.json
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{
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"nodeModulesDir": "manual",
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"tasks": {
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- "dev": "deno run -A --watch=static/,routes/ dev.ts",
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- "build": "deno run -A dev.ts build",
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+ "dev": "vite",
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+ "build": "vite build",
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"start": "deno serve -A _fresh/server.js"
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},
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"imports": {
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"fresh": "jsr:@fresh/core@^2",
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"preact": "npm:preact@^10",
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"@preact/signals": "npm:@preact/signals@^2",
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+ "@fresh/plugin-vite": "jsr:@fresh/plugin-vite@^1",
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+ "vite": "npm:vite@^7",
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+ "@types/babel__core": "npm:@types/babel__core@^7"
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},
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"compilerOptions": {
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"jsx": "precompile",
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"jsxImportSource": "preact",
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+ "types": ["vite/client"]
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}
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}
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```
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If you were using `@fresh/plugin-tailwind` / `@fresh/plugin-tailwindcss-v3`,
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remove those imports — Vite has a first-party Tailwind plugin (see step 4).
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### 2. Replace `dev.ts` with `vite.config.ts`
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Delete `dev.ts` and create a `vite.config.ts` at the project root:
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```ts vite.config.ts
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import { defineConfig } from "vite";
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import { fresh } from "@fresh/plugin-vite";
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export default defineConfig({
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plugins: [fresh()],
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});
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```
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If you passed options to `new Builder({ ... })` (custom `serverEntry`,
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`islandDir`, `routeDir`, `staticDir`, `ignore`), pass the equivalent options to
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`fresh({ ... })` — the names match. See [Configuration](#configuration) above.
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Any `builder.registerIsland("jsr:@scope/pkg/Island.tsx")` calls become
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`fresh({ islandSpecifiers: ["jsr:@scope/pkg/Island.tsx"] })`.
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### 3. Add a `client.ts` entry
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The Builder discovered CSS by scanning `static/`. Vite needs CSS to be part of
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the module graph so it can hash, bundle, and hot-reload it. Move your stylesheet
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out of `static/` and import it from a new `client.ts` file:
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```diff Project structure
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<project root>
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- ├── static/styles.css
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+ ├── assets/styles.css
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+ ├── client.ts
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├── vite.config.ts
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└── main.ts
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```
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```ts client.ts
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// Import CSS files here for hot module reloading to work.
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import "./assets/styles.css";
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```
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Then remove the manual `<link>` from your app wrapper — Vite injects the
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stylesheet for you:
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```diff routes/_app.tsx
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>My App</title>
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- <link rel="stylesheet" href="/styles.css" />
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</head>
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```
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Static assets that are not part of the JS/CSS graph (favicons, images served by
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URL, robots.txt, …) stay in `static/`.
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### 4. Switch the Tailwind plugin (if applicable)
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Replace the Builder-side Tailwind plugin with the official Vite plugin:
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```diff deno.json
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"imports": {
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- "@fresh/plugin-tailwind": "jsr:@fresh/plugin-tailwind@^1",
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- "@tailwindcss/postcss": "npm:@tailwindcss/postcss@^4",
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- "postcss": "npm:postcss@^8",
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+ "@tailwindcss/vite": "npm:@tailwindcss/vite@^4",
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"tailwindcss": "npm:tailwindcss@^4"
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}
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```
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```ts vite.config.ts
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import { defineConfig } from "vite";
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import { fresh } from "@fresh/plugin-vite";
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import tailwindcss from "@tailwindcss/vite";
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export default defineConfig({
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plugins: [fresh(), tailwindcss()],
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});
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```
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Make sure your stylesheet starts with `@import "tailwindcss";` and is imported
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from `client.ts`.
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### 5. Verify
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Run `deno install` to pull in the new npm packages, then:
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```sh Terminal
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deno task dev # starts Vite with HMR
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deno task build # writes _fresh/server.js and client assets
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deno task start # deno serve -A _fresh/server.js
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```
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The output layout under `_fresh/` is the same as the Builder produced, so
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deployment configuration (Deno Deploy, Docker, `deno compile`) does not need to
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change.
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### Checklist
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- [ ] `dev.ts` removed, `vite.config.ts` added
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- [ ] `client.ts` created and imports your CSS
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- [ ] Stylesheet moved out of `static/` and the `<link>` removed from `_app.tsx`
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- [ ] `deno.json` tasks point at `vite` / `vite build`
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- [ ] `@fresh/plugin-vite`, `vite`, and `@types/babel__core` in `imports`
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- [ ] `"vite/client"` in `compilerOptions.types`
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- [ ] Tailwind (if used) switched to `@tailwindcss/vite`
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> [info]: If you get stuck, run `deno run -Ar jsr:@fresh/init` in a scratch
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> directory and diff the generated project against yours — the generator is the
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> source of truth for a working Vite-based Fresh setup.
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## Debugging
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To debug Vite resolution issues, run Vite with the `--debug` flag:

‎packages/fresh/src/runtime/client/dev_hmr.ts‎

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let ws: WebSocket;
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let revision = 0;
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6-
let reconnectTimer: number;
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let reconnectTimer: ReturnType<typeof setTimeout>;
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const backoff = [
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// Wait 100ms initially, because we could also be
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// disconnected because of a form submit.

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