webpack + babel - 转换对象箭头功能不起作用 [英] webpack + babel - transpile object arrow functions doesn't work

问题描述

我正在尝试使用 babel 配置 webpack (5)，使用 babel-loader 转译为 ES5.不幸的是，输出不一致.基本上分为两部分:

I'm trying to configure webpack (5) with babel, using babel-loader to transpile to ES5. Unfortunately, the output is not consistent. Basically, it's divided into two parts:

1. 一些 polyfill:

1. Some polyfills:

我的代码:

如你所见，第一部分包含箭头函数，第二部分没有.我尝试将 @babel/plugin-proposal-class-properties 和 @babel/plugin-transform-arrow-functions 添加到我的 .babelrc 文件，但 class-properties 丢失(启用调试).

As you can see, the first part contains arrow functions, and the second one not. I've tried to add @babel/plugin-proposal-class-properties and @babel/plugin-transform-arrow-functions to my .babelrc file, but the class-properties is missing (with debug enabled).

我必须承认，我不确定 class-properties 是问题所在，但是在 google 上花了几个小时之后，这是我最好的尝试，所以也许我对来源的看法是错误的问题.

I must admit, I'm not sure that the class-properties is the problem, but after spending hours on google it was my best shot, so maybe I'm wrong about the source of the problem.

webpack 文件:

webpack file:

export default {
  entry: './src/index.js',
  mode: 'production',
  output: {
    path: path.resolve(__dirname, '..', '..', 'dist'),
    filename: 'bundle.prod.js'
  },
  module: {
    rules: [
      {
        test: /.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      }
    ]
  }
}

.babelrc 文件:

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "corejs": {
          "version": 3
        },
        "useBuiltIns": "usage",
        "debug": true
      }
    ]
  ],
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-transform-arrow-functions"
  ]
}

节点依赖:

"@babel/core": "7.11.6",
"@babel/plugin-proposal-class-properties": "7.10.4",
"@babel/plugin-transform-arrow-functions": "7.10.4",
"@babel/preset-env": "7.11.5",
"@babel/register": "7.11.5",
"babel-loader": "8.1.0",
"core-js": "3.6.5",
"webpack": "5.0.0",
"webpack-cli": "4.0.0",
"webpack-merge": "5.2.0"

推荐答案

我在使用 webpack v5 时遇到了类似的问题

i had a similar problem with webpack v5

Bootstrap 中的箭头函数

我需要从 webback 更改配置并添加:

i needed to change the config from webback and add:

目标:['es5']

        module: {
            rules: [.....]
        },
        resolve: {
            extensions: [".ts", ".tsx", ".js"]
        },
        target: ['es5']

Weback V5 目标配置

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