Flow support

Describe the bug

I’m trying to write vite-plugin for removing Flow.js types and i’m getting the error below

Reproduction

1. yarn create @vitejs/app template - vanilla
2. (inside generated folder)

yarn install
yarn add -D flow-remove-types

1. Set main.js content:

/* @flow */

type Type = {};

1. Create vite.config.js:

import removeTypes from "flow-remove-types";

export default {
  plugins: [
    {
      name: "vite-plugin-flow",
      enforce: "pre",
      transform(code) {
        const output = removeTypes(code);

        return {
          code: output.toString(),
          map: null,
        };
      },
    },
  ],
};

1. yarn dev // error

But it starts working if:

1. Remove types from main.js
2. yarn dev
3. Add types to main.js

Sorry if i missed something in the docs.

System Info

• vite version: 2.0.3
• Operating System: Ubuntu 18.04
• Node version: 14.15.4
• Package manager (npm/yarn/pnpm) and version: yarn@1.22.5

Logs (Optional if provided reproduction)

1. Run vite or vite build with the --debug flag.

  vite:config bundled config file loaded in 122ms +0ms
  vite:config using resolved config: {
  vite:config   plugins: [
  vite:config     'vite:pre-alias',
  vite:config     'alias',
  vite:config     'vite-plugin-flow',
  vite:config     'vite:dynamic-import-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:client-inject',
  vite:config     'vite:import-analysis'
  vite:config   ],
  vite:config   server: {},
  vite:config   configFile: '/home/eazymov/Documents/projects/test/vite.config.js',
  vite:config   inlineConfig: {
  vite:config     root: undefined,
  vite:config     base: undefined,
  vite:config     mode: undefined,
  vite:config     configFile: undefined,
  vite:config     logLevel: undefined,
  vite:config     clearScreen: undefined,
  vite:config     server: {}
  vite:config   },
  vite:config   root: '/home/eazymov/Documents/projects/test',
  vite:config   base: '/',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object] ] },
  vite:config   publicDir: '/home/eazymov/Documents/projects/test/public',
  vite:config   command: 'serve',
  vite:config   mode: 'development',
  vite:config   isProduction: false,
  vite:config   optimizeCacheDir: '/home/eazymov/Documents/projects/test/node_modules/.vite',
  vite:config   build: {
  vite:config     target: [ 'es2019', 'edge16', 'firefox60', 'chrome61', 'safari11' ],
  vite:config     polyfillDynamicImport: true,
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     sourcemap: false,
  vite:config     rollupOptions: {},
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     minify: 'terser',
  vite:config     terserOptions: {},
  vite:config     cleanCssOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     brotliSize: true,
  vite:config     chunkSizeWarningLimit: 500
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'development', DEV: true, PROD: false },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen]
  vite:config   },
  vite:config   createResolver: [Function: createResolver]
  vite:config } +2ms
  vite:deps Crawling dependencies using entries:
  vite:deps   /home/eazymov/Documents/projects/test/index.html +0ms
  vite:resolve 1ms   /main.js -> /home/eazymov/Documents/projects/test/main.js +0ms
 > main.js:3:5: error: Expected ";" but found "Type"
    3 │ type Type = {};
      ╵      ~~~~

error when starting dev server:
Error: Build failed with 1 error:
main.js:3:5: error: Expected ";" but found "Type"
    at failureErrorWithLog (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:1171:15)
    at buildResponseToResult (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:907:32)
    at /home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:1002:20
    at /home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:553:9
    at handleIncomingPacket (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:642:9)
    at Socket.readFromStdout (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:520:7)
    at Socket.emit (events.js:315:20)
    at addChunk (internal/streams/readable.js:309:12)
    at readableAddChunk (internal/streams/readable.js:284:9)
    at Socket.Readable.push (internal/streams/readable.js:223:10)
error Command failed with exit code 1.

1. Provide the error log here.

$ vite
 > main.js:3:5: error: Expected ";" but found "Type"
    3 │ type Type = {};
      ╵      ~~~~

error when starting dev server:
Error: Build failed with 1 error:
main.js:3:5: error: Expected ";" but found "Type"
    at failureErrorWithLog (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:1171:15)
    at buildResponseToResult (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:907:32)
    at /home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:1002:20
    at /home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:553:9
    at handleIncomingPacket (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:642:9)
    at Socket.readFromStdout (/home/eazymov/Documents/projects/test/node_modules/esbuild/lib/main.js:520:7)
    at Socket.emit (events.js:315:20)
    at addChunk (internal/streams/readable.js:309:12)
    at readableAddChunk (internal/streams/readable.js:284:9)
    at Socket.Readable.push (internal/streams/readable.js:223:10)
error Command failed with exit code 1.

[wehriam]

See @bunchtogether/vite-plugin-flow for flow support.

[Shinigami92]

@wehriam Hey, did you already created a PR in https://github.com/vitejs/awesome-vite ?