Webpack摇晃的树仍然捆绑了未使用的出口

问题描述 投票:1回答:1

我正在尝试测试Webpack的摇树功能,但似乎无法正常工作。

这是我的文件:

  • index.ts
import { good } from './exports';
console.log(good);
  • exports.ts
export const good = 'good';
export const secret = 'iamasecret';
  • tsconfig.json
{}
  • webpack.config.ts
import { Configuration } from 'webpack';
import  * as TerserPlugin from "terser-webpack-plugin";
const config: Configuration = {
    mode: 'production',
    entry: './index.ts',
    module: {
        rules: [
          {
            test: /\.tsx?$/,
            use: 'ts-loader',
            exclude: /node_modules/,
          },
        ],
      },
      resolve: {
        extensions: [ '.tsx', '.ts', '.js' ]
      },
      optimization: {
        usedExports: true,
        minimizer: [new TerserPlugin()],
      }
}
export default config;
  • package.json
{
  "name": "webpacktest",
  "version": "1.0.0",
  "description": "",
  "main": "index.ts",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/terser-webpack-plugin": "^2.2.0",
    "@types/webpack": "^4.41.11",
    "terser-webpack-plugin": "^2.3.5",
    "ts-loader": "^7.0.0",
    "ts-node": "^8.8.2",
    "typescript": "^3.8.3",
    "webpack": "^4.42.1",
    "webpack-cli": "^3.3.11"
  },
  "sideEffects": false
}

当我运行npx webpack时,它将文件捆绑到dist/main.js中。当我打开该文件时,尽管它是未使用的导出,但秘密字符串仍在其中。有什么方法可以阻止它包含在最终捆绑包中?

typescript webpack bundler tree-shaking
1个回答
1
投票

好,所以我知道了。我需要安装软件包@babel/core@babel/preset-envbabel-loader作为dev-dependencies,并将用于处理TypeScript文件的Webpack配置规则更改为:

    {
        test: /\.tsx?$/,
        use: ['babel-loader','ts-loader'],
        exclude: /node_modules/,
    },

接下来,我创建了一个具有以下内容的.babelrc文件:

{
    "presets": [
        [
            "@babel/preset-env",
            {
                "modules": false
            }
        ]
    ]
}

最后,我将以下几行更改/添加到了tsconfig.json下的compilerOptions

"module": "es6",
"moduleResolution": "node",

使用babel-loader,设置.babelrc配置,并使用"module": "es6",允许我的TypeScript代码摇晃。 "moduleResolution": "node"解决了一个错误,该错误是某些模块无法解决的错误。

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