Function withProfiling

test/BenchmarkTestCases.benchmark.mjs:349–397

* @param {string} name name * @param {() => void} fn function * @returns {Promise<void>} function wrapper in profiling code

(name, fn)

 * @returns {Promise<void>} function wrapper in profiling code
 */
async function withProfiling(name, fn) {
	// Ensure the profiles directory exists
	await fs.mkdir(path.join(baseOutputPath, "profiles"), { recursive: true });

	const session = new Session();
	session.connect();

	// Enable and start profiling
	await new Promise(
		/**
		 * @param {(val: void) => void} resolve resolve
		 * @param {(err?: Error) => void} reject reject
		 */
		(resolve, reject) => {
			session.post("Profiler.enable", (err) => {
				if (err) return reject(err);
				session.post("Profiler.start", (err) => {
					if (err) return reject(err);
					resolve();
				});
			});
		}
	);

	// Run the benchmarked function
	// No need to `console.time`, it'll be included in the
	// CPU Profile.
	await fn();

	// Stop profiling and get the CPU profile
	const profile = await new Promise((resolve, reject) => {
		session.post("Profiler.stop", (err, { profile }) => {
			if (err) return reject(err);
			resolve(profile);
		});
	});

	session.disconnect();

	const outputFile = `${sanitizeFilename(name)}-${Date.now()}.cpuprofile`;

	await fs.writeFile(
		path.join(baseOutputPath, "profiles", outputFile),
		JSON.stringify(profile),
		"utf8"
	);

	console.log(`CPU profile saved to ${outputFile}`);
}

/**
 * @param {Webpack} webpack webpack