Migration from v1

Config Options Change

• The following options have been removed and should be implemented via plugins:

  • resolvers
  • transforms
  • indexHtmlTransforms

• jsx and enableEsbuild have been removed; Use the new esbuild option instead.

• CSS related options are now nested under css.

• All build-specific options are now nested under build.

  • rollupInputOptions and rollupOutputOptions are replaced by build.rollupOptions.
  • esbuildTarget is now build.target.
  • emitManifest is now build.manifest.
  • The following build options have been removed since they can be achieved via plugin hooks or other options:
    • entry
    • rollupDedupe
    • emitAssets
    • emitIndex
    • shouldPreload
    • configureBuild

• All server-specific options are now nested under server.

  • hostname is now server.host.
  • httpsOptions has been removed. server.https can directly accept the options object.
  • chokidarWatchOptions is now server.watch.

• assetsInclude now expects string | RegExp | (string | RegExp)[] instead of a function.

• All Vue specific options are removed; Pass options to the Vue plugin instead.

Alias Behavior Change

alias is now being passed to @rollup/plugin-alias and no longer require start/ending slashes. The behavior is now a direct replacement, so 1.0-style directory alias key should remove the ending slash:

- alias: { '/@foo/': path.resolve(__dirname, 'some-special-dir') }
+ alias: { '/@foo': path.resolve(__dirname, 'some-special-dir') }

Alternatively, you can use the [{ find: RegExp, replacement: string }] option format for more precise control.

Vue Support

Vite 2.0 core is now framework agnostic. Vue support is now provided via @vitejs/plugin-vue. Simply install it and add it in the Vite config:

import vue from '@vitejs/plugin-vue'
export default {
  plugins: [vue()]
}

Custom Blocks Transforms

A custom plugin can be used to transform Vue custom blocks like the one below:

// vite.config.js
import vue from '@vitejs/plugin-vue'
const vueI18nPlugin = {
  name: 'vue-i18n',
  transform(code, id) {
    if (!/vue&type=i18n/.test(id)) {
      return
    }
    if (/\.ya?ml$/.test(id)) {
      code = JSON.stringify(require('js-yaml').safeLoad(code.trim()))
    }
    return `export default Comp => {
      Comp.i18n = ${code}
    }`
  }
}
export default {
  plugins: [vue(), vueI18nPlugin]
}

React Support

React Fast Refresh support is now provided via @vitejs/plugin-react-refresh.

HMR API Change

import.meta.hot.acceptDeps() have been deprecated. import.meta.hot.accept() can now accept single or multiple deps.

Manifest Format Change

The build manifest now uses the following format:

{
  "index.js": {
    "file": "assets/index.acaf2b48.js",
    "imports": [...]
  },
  "index.css": {
    "file": "assets/index.7b7dbd85.css"
  }
  "asset.png": {
    "file": "assets/asset.0ab0f9cd.png"
  }
}

For entry JS chunks, it also lists its imported chunks which can be used to render preload directives.

For Plugin Authors

Vite 2 uses a completely redesigned plugin interface which extends Rollup plugins. Please read the new Plugin Development Guide.

Some general pointers on migrating a v1 plugin to v2:

• resolvers -> use the resolveId hook
• transforms -> use the transform hook
• indexHtmlTransforms -> use the transformIndexHtml hook
• Serving virtual files -> use resolveId + load hooks
• Adding alias, define or other config options -> use the config hook

Since most of the logic should be done via plugin hooks instead of middlewares, the need for middlewares is greatly reduced. The internal server app is now a good old connect instance instead of Koa.