feat: delegate build scripts to edx/frontend-build (#257)

webpack.prod.config.js

@@ -0,0 +1,21 @@
+const glob = require('glob');
+const PurgecssPlugin = require('purgecss-webpack-plugin');
+const { createConfig } = require('@edx/frontend-build');
+
+module.exports = createConfig('webpack-prod', {
+  plugins: [
+    // Scan files for class names and ids and remove unused css
+    new PurgecssPlugin({
+      paths: [].concat(
+        // Scan files in this app
+        glob.sync('src/**/*', { nodir: true }),
+        // Scan files in any edx frontend-component
+        glob.sync('node_modules/@edx/frontend-component*/**/*', { nodir: true }),
+        // Scan files in paragon
+        glob.sync('node_modules/@edx/paragon/**/*', { nodir: true }),
+      ),
+      // Protect react-css-transition class names
+      whitelistPatterns: [/-enter/, /-appear/, /-exit/],
+    }),
+  ],
+});