如何将 babel 与 webpack 一起使用以实现 ie11 兼容性

Question

这是我第一次使用 webpack 和 babel，我的目标是让我的小模板应用与 ie11 兼容。

由于某种原因我忽略了，我的 JS 在 ie11 中根本不起作用，即使我确实在我的配置中将它设置为目标。为了测试它，我在互联网上使用了 ie11，但由于我在 MacOS 上，所以我无法访问堆栈错误。

我在这里错过了什么？

更多信息源代码：https://github.com/VelynnXV/Front-End-Workflow

网站：https://nifty-noether-cafbd5.netlify.app/

app.js

import regeneratorRuntime from "regenerator-runtime";

async function app() {

  console.log('App entry point')
  const template = document.getElementById('app')
  await new Promise(r => setTimeout(() => r(), 2500))
  template.innerHTML = `
  <div class="web-container">
      <div id="">
          Async / awat test
      </div>
  </div>
`
  console.log('App finished')
};
app();

webpack.config.json

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: ['core-js/stable', './src/app.js'],
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'app.js',
  },
  devServer: {
    publicPath: "./src/",
    contentBase: path.join(__dirname, 'dist'),
    compress: true,
    port: 9000,
  },
  plugins: [
    new HtmlWebpackPlugin({ // will generate the html file WITH app.js
      // see plugin here : https://webpack.js.org/plugins/html-webpack-plugin/
      template: './src/index.html',
      filename: './index.html'
    })
  ],
  module: {
    rules: [ // set of rules letting webpack know how to handle .xyz files 
      {
        test: /\.m?js$/, // source: https://webpack.js.org/loaders/babel-loader/
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',

        }
      }
    ],
  },
};

babel.config.js

// babel.config.js

module.exports = api => {
    return {
      plugins: [
        "@babel/plugin-proposal-nullish-coalescing-operator",
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-transform-runtime",
      ],
      
      presets: [
        [
          "@babel/preset-env",
          {
            useBuiltIns: "entry",
            corejs:3,
            // caller.target will be the same as the target option from webpack
            targets: api.caller(caller => caller && caller.target === "node")
              ? { node: "current" }
              : { chrome: "58", ie: "11" }
          }
        ]
      ]
    }
  }
  

package.json

{
  "name": "front-end-workflow",
  "version": "1.0.0",
  "description": "",
  "main": "src/app.js",
  "scripts": {
    "dev": "npm run clean && npm run build && webpack serve",
    "build": "webpack",
    "clean": "rimraf ./dist"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.12.17",
    "@babel/plugin-transform-runtime": "^7.12.17",
    "@babel/preset-env": "^7.12.17",
    "babel-loader": "^8.2.2",
    "css-loader": "^5.0.2",
    "html-loader": "^2.1.0",
    "html-webpack-plugin": "^5.2.0",
    "sass": "^1.32.8",
    "sass-loader": "^11.0.1",
    "style-loader": "^2.0.0",
    "webpack": "^5.23.0",
    "webpack-cli": "^4.5.0",
    "webpack-dev-server": "^3.11.2"
  },
  "dependencies": {
    "@babel/runtime": "^7.6.3",
    "core-js": "^3.3.2"
  }
}

Answer 1

您几乎拥有完整的 IE11 支持配置。您唯一缺少的是 webpack 配置中的 target: "es5" 选项。 Babel 正确地编译了你的文件。 Webpack 还注入了所有必要的 polyfill。但是，您需要告诉 Webpack 何时将代码捆绑在一起以使用目标浏览器可以理解的语法。无论出于何种原因，Webpack 将默认设置为包含箭头函数的 ES 版本。 IE11 控制台显示的错误 (SCRIPT1002:syntax error) 指向捆绑的 app.js 文件中第一次出现的箭头函数。

额外提示：在您的 babel 配置中使用 comments: false 将代码 cmets 从您的包中剥离。这可以稍微减小您的捆绑包的大小。

您可以在您的仓库中 git apply 这个差异来接受更改。

diff --git a/babel.config.js b/babel.config.js
index 8d2442b..273176c 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -2,6 +2,7 @@
 
 module.exports = api => {
     return {
+      comments: false,
       plugins: [
         "@babel/plugin-transform-runtime",
       ],
diff --git a/webpack.config.js b/webpack.config.js
index 2243a11..08af521 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -21,6 +21,7 @@ module.exports = {
       filename: './index.html'
     })
   ],
+  target: "es5",
   module: {
     rules: [ // set of rules letting webpack know how to handle .xyz files using loader
       // see loaders : https://webpack.js.org/loaders/