Ignore proxy-polyfill in workers (#6011)

build-scripts/rollup-plugins/worker-plugin.js

@@ -25,7 +25,7 @@ const defaultOpts = {
   // A RegExp to find `new Workers()` calls. The second capture group _must_
   // capture the provided file name without the quotes.
   workerRegexp: /new Worker\((["'])(.+?)\1(,[^)]+)?\)/g,
-  plugins: ["node-resolve", "commonjs", "babel"],
+  plugins: ["node-resolve", "commonjs", "babel", "terser", "ignore"],
 };
 
 async function getBundledWorker(workerPath, rollupOptions) {