Pure annotations house cleaning: Webpack

[pschroen]

Related issue: #24199

Troubleshooting the remaining side-effects in r142, I've gone through all the /*@__PURE__*/ annotations again with webpack this time.

[pschroen]

This pure annotation isn't needed.

[pschroen]

Object destructuring assignment with a pure annotation doesn't work in webpack/terser.

[pschroen]

FWIW here's my webpack configuration I've been using for troubleshooting tree-shaking, I like having the output as human readable as possible, and process of elimination from bottom to top. 😅

mkdir test
cd test
npm init -y
npm i three webpack webpack-cli

webpack.config.js

const TerserPlugin = require('terser-webpack-plugin');
const path = require('path');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  experiments: {
    outputModule: true,
  },
  optimization: {
    usedExports: true,
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          compress: {
            defaults: false,
            unused: true,
          },
          mangle: false,
          format: {
            comments: true,
            beautify: true,
          },
        },
        extractComments: false,
      }),
    ],
  },
  mode: 'production',
};

src/index.js

import { Vector2 } from 'three';

console.log(new Vector2(0, 1));

npx webpack

[mrdoob]

Thanks!