Made polyfill route more flexible

src/polyfill-worker.ts

@@ -5,14 +5,14 @@ import {analyze} from '@10xjs/polyfill-analyzer';
 import allPolyfills from '@10xjs/polyfill-analyzer/dist/polyfills';
 import {PolyfillFeatureList} from 'polyfill-library';
 
-expose(() => {
+expose((fileToWatch) => {
 	const exclude = [
 		"console.markTimeline",
 		"console.timeline",
 		"console.timelineEnd",
 	];
 	const featureList = analyze({
-		source: fs.readFileSync('./public/js/bundle.js', 'utf-8'),
+		source: fs.readFileSync(fileToWatch, 'utf-8'),
 		include: allPolyfills.filter(x => !exclude.includes(x)),
 		// Not all features listed by polyfillLibrary.listAllPolyfills()` can be detected.
 		unsupportedPolyfill: 'ignore',

src/polyfill.ts

@@ -19,23 +19,21 @@ export type PolyfillOptions = {
 	rum: boolean,
 }
 
-const features = new WaitForSync<PolyfillFeatureList>();
+function getRouter(fileToWatch: string, opts?: Partial<PolyfillOptions>): RequestHandler {
+	const features = new WaitForSync<PolyfillFeatureList>();
+	(async () => {
+		const worker = await spawn<WorkerFunction>(new Worker("./polyfill-worker"));
+		const feats = await worker(fileToWatch) as PolyfillFeatureList;
+		await Thread.terminate(worker);
+		return feats;
+	})()
+		.then(feats => {
+			feats["fetch"] = {};
+			Logger.debug("Polyfill analysed:", Object.keys(feats));
+			features.setData(feats);
+		})
+		.catch(err => features.setError(err));
 
-(async () => {
-	const worker = await spawn<WorkerFunction>(new Worker("./polyfill-worker"));
-	const feats = await worker() as PolyfillFeatureList;
-	await Thread.terminate(worker);
-	return feats;
-})()
-	.then(feats => {
-		feats["fetch"] = {};
-		Logger.debug("Polyfill analysed:", Object.keys(feats));
-		features.setData(feats);
-	})
-	.catch(err => features.setError(err));
-
-
-function getRouter(opts?: Partial<PolyfillOptions>): RequestHandler {
 	const options: Partial<PolyfillOptions> = {
 		minify: DefaultConfig.isProduction,
 		unknown: "polyfill",