javascript - 如何为 IE11 正确使用 babel/corejs3/webpack？

Question

使用我当前的配置(见下文)，我收到此错误:

   [object Error]{description: "Argument ob...", message: "Argument ob...", name: "TypeError", number: -2147418113, stack: "TypeError: ...", Symbol()_7.bs7gi3oa3wi: undefined}

我尝试根据 Symbol()_ ... : undefined} 进行挖掘但我找不到任何明确的迹象。

这是我的 .babel.config.js :

module.exports = function (api) {
    api.cache(true);
    const presets = [
      [
        '@babel/preset-env',
        {
         // modules: false,
          corejs:"3.6.4",
          useBuiltIns: 'usage',
          targets: {
            browsers: [
              "edge >= 16",
              "safari >= 9",
              "firefox >= 57",
              "ie >= 11",
              "ios >= 9",
              "chrome >= 49"
            ]
          }
        }
      ]
    ];
    const plugins= [
        ["@babel/plugin-proposal-decorators", { decoratorsBeforeExport: true }],
        ["@babel/plugin-proposal-class-properties", { "loose": true }]
    ];
    return {
      presets,
      plugins
    }
  }

这是我的 webpackconfig.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
       // exclude: /node_modules/,
       exclude : [
        /\bcore-js\b/,
        /\bwebpack\/buildin\b/
      ],
        use: {
          loader: 'babel-loader',
          options:{
            sourceType: "unambiguous"
          }
        },
      },
    ],
  },
  devtool:"cheap-source-map",
  resolve: {
    extensions: ['*', '.js'],
  },
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'shim.js',
  }
};

我也尝试了很多替代方案，这是我目前使用的， entry:"usage"不排除 node_modules .

这是来自我的 package.json :

 "devDependencies": {
    "@babel/core": "^7.9.0",
    "@babel/plugin-proposal-class-properties": "^7.8.3",
    "@babel/plugin-proposal-decorators": "^7.8.3",
    "@babel/preset-env": "^7.9.5",
    "babel-loader": "^8.1.0",
    "eslint": "^6.8.0",
    "eslint-config-google": "^0.14.0",
    "webpack": "^4.42.1",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.10.3",
    "dotenv-webpack": "^1.7.0"
  },
  "dependencies": {
    "core-js": "^3.6.4",
    "ismobilejs": "^1.0.3",
    "localforage": "1.7.3",
    "postmate": "^1.5.2",
    "uuid": "^7.0.3"
  }

错误似乎来自第一次调用 Postmate图书馆即 new Postmate({...}) (我之前有一个 console.log)。在此电话之前，我有一个到 localforage并且 promise 成功完成。

Answer 1

使用 useBuiltIns: "usage"
您通常必须在代码条目文件中导入要使用的模块(例如 Postmate)；没有填充物； @babel/preset-env 将相应地处理使用的每个 polyfill .此外，corejs 的版本在 @babel/preset-env必须是单个数字(即 3 或 2 )。babel.config.js的内容:

module.exports = function (api) {
  api.cache(true);
  const presets = [
    [
      '@babel/preset-env',
      {
        corejs : {
          version : "3",
          proposals : true
        },
        useBuiltIns: 'usage',
        targets: {
          browsers: [
            "edge >= 16",
            "safari >= 9",
            "firefox >= 57",
            "ie >= 11",
            "ios >= 9",
            "chrome >= 49"
          ]
        }
      }
    ]
  ];
  const plugins= [
      ["@babel/plugin-proposal-decorators", { decoratorsBeforeExport: true }],
      ["@babel/plugin-proposal-class-properties", { "loose": true }]
  ];
  return {
    presets,
    plugins
  }
}

webpackconfig.js的内容:

const path = require('path');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: [
          /\bcore-js\b/,
          /\bwebpack\/buildin\b/
        ],
        use: {
          loader: 'babel-loader',
          options: {
            babelrc: false,
            configFile: path.resolve(__dirname, 'babel.config.js'),
            compact: false,
            cacheDirectory: true,
            sourceMaps: false,
          },
        },
      },
    ],
  },
  devtool: "cheap-source-map",
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'shim.js',
  }
}

入口JS文件内容 src/index.js :

import Postmate from 'postmate';

// Postmate and rest of the code
...

它将生成:

dist/shim.js      177K
dist/shim.js.map  140K

您可以使用 useBuiltIns: "usage" 测试在线分布式示例。在 IE 11 这里: https://zikro.gr/dbg/so/61044894/usage/ . (子 iFrame 有一个按钮，可以将父窗口背景颜色更改为随机颜色)
您可以找到包含整个项目的存储库和 用法示例分支在这个 Github 存储库/分支中: https://github.com/clytras/ie11-postmate/tree/usage
使用 useBuiltIns: "entry"
根据this issue disqussion "using Symbol causes exception in IE11" ， 你必须:

排除 @babel-runtime和 core-js在 .js 的规则中文件。

有corejs: "3"和 useBuiltIns: 'entry'至@babel/preset-env预设在 babel.config.js文件。

必须有core-js/stable和 postmate在您的入口源 JS 文件中导入。

babel.config.js的内容:

module.exports = function (api) {
  api.cache(true);
  const presets = [
    [
      '@babel/preset-env',
      {
        corejs:"3",
        useBuiltIns: 'entry',
        targets: {
          browsers: [
            "edge >= 16",
            "safari >= 9",
            "firefox >= 57",
            "ie >= 11",
            "ios >= 9",
            "chrome >= 49"
          ]
        }
      }
    ]
  ];
  const plugins= [
      ["@babel/plugin-proposal-decorators", { decoratorsBeforeExport: true }],
      ["@babel/plugin-proposal-class-properties", { "loose": true }]
  ];
  return {
    presets,
    plugins
  }
}

webpackconfig.js的内容:

const path = require('path');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /@babel(?:\/|\\{1,2})runtime|core-js/,
        use: {
          loader: 'babel-loader',
          options: {
            babelrc: false,
            configFile: path.resolve(__dirname, 'babel.config.js'),
            compact: false,
            cacheDirectory: true,
            sourceMaps: false,
          },
        },
      },
    ],
  },
  devtool:"cheap-source-map",
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'shim.js',
  }
}

入口JS文件内容 src/index.js :

import 'core-js/stable';
window.Postmate = require('postmate/build/postmate.min.js');

// Postmate and rest of the code
...

它将生成:

dist/shim.js      641K
dist/shim.js.map  459K

您可以在 中测试IE 11 这里: https://zikro.gr/dbg/so/61044894/ .