Function makeNewProfiledTapFn

lib/debug/ProfilingPlugin.js:535–620

(hookName, tracer, { name, type, fn })

 * @returns {PluginFunction} Chainable hooked function.
 */
const makeNewProfiledTapFn = (hookName, tracer, { name, type, fn }) => {
	const defaultCategory = ["blink.user_timing"];

	switch (type) {
		case "promise":
			return (...args) => {
				const id = ++tracer.counter;
				tracer.trace.begin({
					name,
					id,
					cat: defaultCategory
				});
				const promise =
					/** @type {Promise<(...args: EXPECTED_ANY[]) => EXPECTED_ANY>} */
					(fn(...args));
				return promise.then((r) => {
					tracer.trace.end({
						name,
						id,
						cat: defaultCategory
					});
					return r;
				});
			};
		case "async":
			return (...args) => {
				const id = ++tracer.counter;
				tracer.trace.begin({
					name,
					id,
					cat: defaultCategory
				});
				const callback = args.pop();
				fn(
					...args,
					/**
					 * Handles the cat callback for this hook.
					 * @param {...EXPECTED_ANY[]} r result
					 */
					(...r) => {
						tracer.trace.end({
							name,
							id,
							cat: defaultCategory
						});
						callback(...r);
					}
				);
			};
		case "sync":
			return (...args) => {
				const id = ++tracer.counter;
				// Do not instrument ourself due to the CPU
				// profile needing to be the last event in the trace.
				if (name === PLUGIN_NAME) {
					return fn(...args);
				}