Add some comments and log out build stats for each bundle

scripts/bundle-esm.js

@@ -4,10 +4,14 @@
 /* eslint-disable guard-for-in */
 /* eslint-disable node/no-extraneous-require */
 
+const bundleReport = require('@parcel/reporter-cli/lib/bundleReport').default;
 const defaultConfigContents = require('@parcel/config-default');
 const Parcel = require('@parcel/core').default;
 const { createWorkerFarm } = require('@parcel/core');
 
+// TODO: maybe it's worth verifying that all syntaxes are bundled?
+// Though this is unlikely to change very often.
+
 const config = {
 	browser: {
 		target: { distDir: 'dist' },
@@ -16,8 +20,8 @@ const config = {
 	},
 	'syntax-css-in-js': {
 		target: { distDir: 'dist' },
-		entry: 'lib/syntaxes/syntax-less.js',
-		// dest: 'dist/syntax-less.js',
+		entry: 'lib/syntaxes/syntax-css-in-js.js',
+		// dest: 'dist/syntax-css-in-js.js',
 	},
 	'syntax-html': {
 		target: { distDir: 'dist' },
@@ -51,6 +55,9 @@ const config = {
 };
 
 let tasks = [];
+
+// Workers have a startup cost. We can keep the workers around between runs,
+// then shut them down when all bundles have been created.
 let workerFarm = createWorkerFarm();
 
 for (const module in config) {
@@ -67,32 +74,35 @@ for (const module in config) {
 			},
 			includeNodeModules: true,
 			isLibrary: false,
-			logLevel: 'verbose',
+			logLevel: 'warn',
 			minify: true,
 			mode: 'production',
 			outputFormat: 'esmodule',
 			patchConsole: false,
 			workerFarm,
 		});
 
-		return await bundler.run();
+		const bundleGraph = await bundler.run();
+		const options = bundler._getResolvedParcelOptions(); // hackety hack. Not a public API
+
+		// log stats. This is similar to setting `logLevel: verbose`, but skips the progress spinner
+		await bundleReport(bundleGraph, options.outputFS, options.projectRoot, options.detailedReport);
+
+		return bundleGraph;
 	};
 
-	tasks.push([module, task]);
+	tasks.push(task);
 }
 
 (async () => {
 	try {
-		for (const [module, task] of tasks) {
-			const res = await task();
-
-			console.log(res.getBundles()[0].stats);
-			console.log(`bundled ${module}`, res);
+		for (const task of tasks) {
+			await task();
 		}
 	} catch (error) {
 		console.error(error);
 	} finally {
-		await workerFarm.end();
+		await workerFarm.end(); // finished bundling, so we can shut the farm.
 	}
 })();