JavascriptModulesPlugin#

class MyJsMinimizerPlugin {
  apply(compiler) {
    compiler.hooks.compilation.tap(MyJsMinimizerPlugin.name, compilation => {
      // 用来获取 JavascriptModulesPlugin 的 chunkHash 钩子
      const hooks =
        compiler.webpack.javascript.JavascriptModulesPlugin.getCompilationHooks(
          compilation,
        );
      // 由于 JS chunk 被优化，内容改变，所以要更新 JS chunk 的 chunk hash
      hooks.chunkHash.tap(MyJsMinimizerPlugin.name, (chunk, hash) => {
        hash.update(`minimized by ${MyJsMinimizerPlugin.name}`);
      });
      // 优化 JS chunk
      compilation.hooks.processAssets.tap(MyJsMinimizerPlugin.name, assets => {
        optimize(assets);
      });
    });
  }
}