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README.md

@perf-tools/keeper (aka PerfKeeper)

PerfKeeper — It's a tool for performance monitoring and profiling your application (also best replacement for console.time).

npm i --save @perf-tools/keeper

Features

Usage

// System keeper
import { system } from '@perf-tools/keeper';


// Custom keeper
import { create } from '@perf-tools/keeper';
import { googleAnalytics } from '@perf-tools/keeper/analytics/google';

const keeper = perfKeeper.create({
	print: true,    // DevTools -> Console
	timeline: true, // DevTools -> Performance -> User timings
	prefix: '⏱',
	analytics: [
		googleAnalytics({prefix: 'MyApp-'}),
	],
});

// 1. Classic usage variant
keeper.time('FooBar');
// ...
keeper.timeEnd('FooBar'); // ⏱FooBar: 37ms

// 2. Shorted usage variant
const timer = keeper.time('FooBar'); // ⏱FooBar: 37ms
// ...
timer.stop();

// 3. Functional usage variant
keeper.time('FooBar', () => { // ⏱FooBar: 37ms
	// ...
});

// 4. Usage variant with groups
const group = keeper.group('App');
group.mark('init'); // starting 'init' timer
// ...

group.mark('prepare'); // ending 'init' and starting 'prepare' timer
// ...

group.mark('render'); // ending 'prepare' and starting 'render' timer
// ...

group.stop(); // starting 'render' timer

// ⏱App: 382ms
//    ⏱init: 243ms
//    ⏱prepare: 19ms
//    ⏱render: 120ms

Inline Usage

<html>
<head>
	<script>
		/**
		 * Replace this comment on the code from this files:
		 *  - ./dist/perf-keeper.js
		 *  - ./dist/perf-keeper.extentions.js
		 *  - ./dist/perf-keeper.analytics.google.js
		 */

		// Setup system keeper
		perfKeeper.system.print(true);
		perfKeeper.system.setAnalytics([perfKeeperAnalyticsGoogle.googleAnalytics()]);
		perfKeeperExtentions.set(perfKeeper.system);

		// Create custom keeper
		var keeper = perfKeeper.create({
			print: true,    // DevTools -> Console
			timeline: true, // DevTools -> Performance
			prefix: '⏱',
			analytics: [
				perfKeeperAnalyticsGoogle.googleAnalytics({
					prefix: 'MyApp-',
				}),
			],
		});
		keeper.group('head');
	</script>

	<script>
		keeper.time('icon');
	</script>
	<link rel="shortcut icon" type="image/x-icon" href="..."/>
	<link rel="apple-touch-icon" href="..." />
	<!-- etc -->
	<script>
		keeper.timeEnd('icon');
		keeper.time('css');
	</script>
	<link type="text/css" rel="stylesheet" href="..."/>
	<!-- etc -->
	<script>
		keeper.timeEnd('css');
		keeper.groupEnd();
	</script>
</head>
<body>
	<script>
		keeper.group('body');
	</script>
	<!-- ... -->
	<script>
		keeper.time('javascript');
	</script>
	<script src="./boot/loader"></script>
	<!-- etc -->
	<script>
		keeper.timeEnd('javascript');

		const gapp = keeper.group('app', true);

		gapp.mark('require');
		require(['app/bootstrap'], (bootstrap) => {
			gapp.mark('boot');
			bootstrap(document);
			gapp.stop();
		});
	</script>
	<!-- ... -->
	<script>
		keeper.groupEnd();
	</script>
</body>
</html>

API

  • create(options: KeeperOptions): PerfKeeper
    • options
      • disabled: boolean — turn off the work PerfKeeper (optional)
      • print: boolean — on/off output to console (optional)
      • perf: Partial<Performance> — custom object like performance (optional)
      • console: Partial<Console> — custom object like console (optional)
      • timeline: boolean — on/off usage DevTools -> User Timings (optional)
      • analytics: Array<(entry: PerfEntry) => void>
      • warn: (msg: string) => void — callback for catching internal warnings (optional)
    • PerfKeeper, instance methods:
      • print: (enable?: boolean) => void
      • disable: (state: boolean) => void
      • setAnalytics: (list: Array<(entry: PerfEntry) => void>) => void
      • add(name: string, start: number, end: number, unit?: string): Entry
      • time(name: string, callback: () => void): Entry — measure execution time of callback
      • time(name: string, start?: number): Entry — start timer
      • timeEnd(name: string, end?: number): void - stop timer by label
      • group(name: string): GroupEntry
      • group(name: string, isolate: true): GroupEntry
      • group(name: string, start: number, isolate?: true): GroupEntry
      • groupEnd(name?: string, end?: number): void
    • Entry
      • id: string — unique identifier
      • unit: 'ms' | 'KiB' | 'fps' | 'raw' — metric unit
      • name: string — name of measure
      • start: number — start mark
      • end: number — end mark
      • parent: PerfGroupEntry | null — reference on parent
      • stop(end?: number): void — complete the measurement (set end prop)
    • GroupEntry (extends Entry)
      • entries: Entry[] — nested metrics
      • add(name: string, start: number, end: number, unit?: string): Entry
      • time(name: string, start?: number): Entry
      • timeEnd(name: string, end?: number): void
      • mark(name: string): void — start the timer with stopping a previous one in the group.
      • group(name: string, unit?: string): GroupEntry
      • stop(end?: number): void — complete the measurement of group (set end prop)

Examples

Console

DevTools / Console

User Timing aka Timeline

DevTools / Timelime

Development