chore: import upstream snapshot with attribution

tools/client-plugins/browser-scripts/webpack.config.cjs

@@ -0,0 +1,70 @@
+const path = require('path');
+const webpack = require('webpack');
+
+const { version } = require('./package.json');
+
+module.exports = (env = {}) => {
+  const __DEV__ = env.production !== true;
+
+  return {
+    cache: __DEV__ ? { type: 'filesystem' } : false,
+    mode: __DEV__ ? 'development' : 'production',
+    entry: {
+      'sass-compile': './sass-compile.ts',
+      'python-worker': './python-worker.ts',
+      'typescript-worker': './typescript-worker.ts'
+    },
+    devtool: __DEV__ ? 'inline-source-map' : 'source-map',
+    output: {
+      chunkFilename: '[name]-[contenthash].js',
+      path: path.resolve(__dirname, `dist/js/workers/${version}`),
+      clean: false // We handle cleaning in copy-scripts.ts
+    },
+    stats: {
+      // Display bailout reasons
+      optimizationBailout: true
+    },
+    module: {
+      rules: [
+        {
+          test: /\.(js|ts)$/,
+          exclude: /node_modules/,
+          use: {
+            loader: 'babel-loader',
+            options: {
+              babelrc: false,
+              presets: [
+                [
+                  '@babel/preset-env',
+                  { modules: false, targets: '> 0.25%, not dead' }
+                ],
+                '@babel/preset-typescript'
+              ],
+              plugins: [
+                '@babel/plugin-transform-runtime',
+                '@babel/plugin-syntax-dynamic-import'
+              ]
+            }
+          }
+        }
+      ]
+    },
+    plugins: [
+      new webpack.ProvidePlugin({
+        process: 'process/browser'
+      }),
+      new webpack.ProvidePlugin({
+        Buffer: ['buffer', 'Buffer']
+      })
+    ],
+    resolve: {
+      fallback: {
+        buffer: require.resolve('buffer'),
+        util: require.resolve('util'),
+        stream: false,
+        process: require.resolve('process/browser.js')
+      },
+      extensions: ['.js', '.ts']
+    }
+  };
+};