6

我正在为我觉得不应该太难的设置而苦苦挣扎。我希望这三种技术一起工作:

  • webpack 打包代码
  • babel 以便我能够编写现代 JavaScript
  • flow 因为类型检查很有帮助,就像测试和 linter

我已经经历了几次这样的设置,但我在网上找到的文章似乎都没有帮助。


我在我package.jsonrunflowbuild. 类型检查yarn run flow非常有效,babel-node使用yarn run start.

但是当我执行时yarn run build,通过 webpack 出现以下错误:

$ ./node_modules/webpack/bin/webpack.js
Hash: 207d42dac5784520fc99
Version: webpack 3.10.0
Time: 49ms
    Asset     Size  Chunks             Chunk Names
bundle.js  2.65 kB       0  [emitted]  main
   [0] ./src/main.js 181 bytes {0} [built] [failed] [1 error]

ERROR in ./src/main.js
Module parse failed: Unexpected token (3:5)
You may need an appropriate loader to handle this file type.
| // @flow
|
| type Foo = {
|   foo: string,
| };
error Command failed with exit code 2.

在我看来,类型注释没有在正确的位置正确删除。可悲的是,如果我直接在 webpack 中指定 babel 选项而不是.babelrc.

目前,这让我在使用 flow 时捆绑一堆.js文件时遇到了挫折,而我发现几个插件据说可以简单地使用flow预设来剥离流注释,这似乎是 flowtype.org 推荐的。


为了重现性,我的项目文件如下所示:

包.json

{
  …
  "dependencies": {},
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.0.3",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.1",
    "babel-preset-flow": "^6.23.0",
    "flow-bin": "^0.60.1",
    "webpack": "^3.9.1"
  },
  "scripts": {
    "build": "./node_modules/webpack/bin/webpack.js",
    "start": "./node_modules/babel-cli/bin/babel-node.js src/main.js",
    "flow": "./node_modules/flow-bin/cli.js"
  }
}

.flowconfig

[include]
./src

[ignore]

[libs]

[lints]

[options]

.babelrc

 {
   "presets": ["env", "flow"]
 }

webpack.config.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: './src/main.js',
  output: {
    path: __dirname,
    filename: 'bundle.js',
  },
  resolve: {
    modules: [
      path.resolve('./src/'),
      'node_modules',
    ],
    extensions: ['.js'],
  },
  module: {
    rules: [
      {
        test: '/.js$/',
        loader: 'babel-loader',
      },
    ],
  },
};

src/main.js

// @flow

type Foo = {
  foo: string,
};

const defaultFoo: Foo = {
  foo: 'bar',
};

console.log(defaultFoo);
4

1 回答 1

3

下载相关预设并将其添加到 webpack.config.js 中,如下所示:

module: {
  rules: [
    {
      test: /\.js$/,
      exclude: /(node_modules|bower_components)/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['es2015', 'stage-0', 'react']
        }
      }
    }
  ]
}
于 2017-12-21T05:34:29.757 回答