Webpack 是原始模块大小的三倍多

Question

我设置了我的环境，我在 TypeScript 中编写客户端 JS 代码（以获得使用 TS 的好处）并使用 Webpack 将其捆绑到我的 Firebase 项目中的 public 目录中。我发现 Webpack 似乎给我的代码增加了很多开销。当原始文件小于 100KiB 时，打包仅导入 Firestore 模块的文件最终会产生大约 300KiB 的代码。

这是一个仍然具有相同行为的最小配置：

index.ts

import 'firebase/firestore';

webpack.config.ts

import { Configuration } from 'webpack';
import path from 'path';

const config: Configuration = {
    mode: 'production',
    entry: path.resolve(__dirname, 'index.ts'),
    module: {
        rules: [
            {
                test: /\.ts?$/,
                use: 'ts-loader',
                exclude: /node_modules/,
            },
        ],
    },
    output: {
        path: path.resolve(__dirname, 'dist'),
        publicPath: '/',
        filename: '[name].js',
        chunkFilename: '[chunkhash].js'
      },
    resolve: {
        extensions: [ '.ts', '.js' ],
        modules: ['node_modules'],
    },
    optimization: {
        minimize: true,
    },
}

export default config;

tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "noImplicitReturns": true,
        "noUnusedLocals": true,
        "outDir": "lib",
        "sourceMap": false,
        "strict": true,
        "target": "es2017",
        "esModuleInterop": true,
    },
    "compileOnSave": true,
}

package.json

{
  "name": "webpack-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "firebase": "^8.0.2"
  },
  "devDependencies": {
    "ts-loader": "^8.0.11",
    "ts-node": "^9.0.0",
    "typescript": "^4.0.5",
    "webpack": "^5.4.0",
    "webpack-cli": "^4.2.0"
  }
}

如上所述，当导入的文件小于 100 KiB 时，最终的包大小为 300+ KiB。我该怎么做才能使我的捆绑包大小不增加三倍？

Answer 1

好的，这看起来像是一个已知问题。在this issue in the Firebase JS SDK GitHub (with conversation moving here). It looks like there's a pretty involved workaround here中首次提到，或者我可以使用 Firebase JS SDK 的实验版本。

Webpack 是原始模块大小的三倍多

Webpack more than triples original module size

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