javascript
const {
	SyncHook,
	SyncBailHook,
	SyncWaterfallHook,
	SyncLoopHook,
	AsyncParallelHook,
	AsyncParallelBailHook,
	AsyncSeriesHook,
	AsyncSeriesBailHook,
	AsyncSeriesWaterfallHook
 } = require("tapable");

 shell
npm install --save tapable

 js
const hook = new SyncHook(["arg1", "arg2", "arg3"]);

 js
class Car {
	constructor() {
		this.hooks = {
			accelerate: new SyncHook(["newSpeed"]),
			brake: new SyncHook(),
			calculateRoutes: new AsyncParallelHook(["source", "target", "routesList"])
		};
	}

	/* ... */
}

 js
const myCar = new Car();

// Use the tap method to add a consument
myCar.hooks.brake.tap("WarningLampPlugin", () => warningLamp.on());

 js
myCar.hooks.accelerate.tap("LoggerPlugin", newSpeed => console.log(`Accelerating to ${newSpeed}`));

 js
myCar.hooks.calculateRoutes.tapPromise("GoogleMapsPlugin", (source, target, routesList) => {
	// return a promise
	return google.maps.findRoute(source, target).then(route => {
		routesList.add(route);
	});
});
myCar.hooks.calculateRoutes.tapAsync("BingMapsPlugin", (source, target, routesList, callback) => {
	bing.findRoute(source, target, (err, route) => {
		if(err) return callback(err);
		routesList.add(route);
		// call the callback
		callback();
	});
});

// You can still use sync plugins
myCar.hooks.calculateRoutes.tap("CachedRoutesPlugin", (source, target, routesList) => {
	const cachedRoute = cache.get(source, target);
	if(cachedRoute)
		routesList.add(cachedRoute);
})

 js
class Car {
	/**
	  * You won't get returned value from SyncHook or AsyncParallelHook,
	  * to do that, use SyncWaterfallHook and AsyncSeriesWaterfallHook respectively
	 **/

	setSpeed(newSpeed) {
		// following call returns undefined even when you returned values
		this.hooks.accelerate.call(newSpeed);
	}

	useNavigationSystemPromise(source, target) {
		const routesList = new List();
		return this.hooks.calculateRoutes.promise(source, target, routesList).then((res) => {
			// res is undefined for AsyncParallelHook
			return routesList.getRoutes();
		});
	}

	useNavigationSystemAsync(source, target, callback) {
		const routesList = new List();
		this.hooks.calculateRoutes.callAsync(source, target, routesList, err => {
			if(err) return callback(err);
			callback(null, routesList.getRoutes());
		});
	}
}

 js
myCar.hooks.calculateRoutes.intercept({
	call: (source, target, routesList) => {
		console.log("Starting to calculate routes");
	},
	register: (tapInfo) => {
		// tapInfo = { type: "promise", name: "GoogleMapsPlugin", fn: ... }
		console.log(`${tapInfo.name} is doing its job`);
		return tapInfo; // may return a new tapInfo object
	}
})

 js
myCar.hooks.accelerate.intercept({
	context: true,
	tap: (context, tapInfo) => {
		// tapInfo = { type: "sync", name: "NoisePlugin", fn: ... }
		console.log(`${tapInfo.name} is doing it's job`);

		// `context` starts as an empty object if at least one plugin uses `context: true`.
		// If no plugins use `context: true`, then `context` is undefined.
		if (context) {
			// Arbitrary properties can be added to `context`, which plugins can then access.
			context.hasMuffler = true;
		}
	}
});

myCar.hooks.accelerate.tap({
	name: "NoisePlugin",
	context: true
}, (context, newSpeed) => {
	if (context && context.hasMuffler) {
		console.log("Silence...");
	} else {
		console.log("Vroom!");
	}
});

 js
const keyedHook = new HookMap(key => new SyncHook(["arg"]))

 js
keyedHook.for("some-key").tap("MyPlugin", (arg) => { /* ... */ });
keyedHook.for("some-key").tapAsync("MyPlugin", (arg, callback) => { /* ... */ });
keyedHook.for("some-key").tapPromise("MyPlugin", (arg) => { /* ... */ });

 js
const hook = keyedHook.get("some-key");
if(hook !== undefined) {
	hook.callAsync("arg", err => { /* ... */ });
}

 ts
interface Hook {
	tap: (name: string | Tap, fn: (context?, ...args) => Result) => void,
	tapAsync: (name: string | Tap, fn: (context?, ...args, callback: (err, result: Result) => void) => void) => void,
	tapPromise: (name: string | Tap, fn: (context?, ...args) => Promise<Result>) => void,
	intercept: (interceptor: HookInterceptor) => void
}

interface HookInterceptor {
	call: (context?, ...args) => void,
	loop: (context?, ...args) => void,
	tap: (context?, tap: Tap) => void,
	register: (tap: Tap) => Tap,
	context: boolean
}

interface HookMap {
	for: (key: any) => Hook,
	intercept: (interceptor: HookMapInterceptor) => void
}

interface HookMapInterceptor {
	factory: (key: any, hook: Hook) => Hook
}

interface Tap {
	name: string,
	type: string
	fn: Function,
	stage: number,
	context: boolean,
	before?: string | Array
}

 ts
interface Hook {
	isUsed: () => boolean,
	call: (...args) => Result,
	promise: (...args) => Promise<Result>,
	callAsync: (...args, callback: (err, result: Result) => void) => void,
}

interface HookMap {
	get: (key: any) => Hook | undefined,
	for: (key: any) => Hook
}

 js
const { MultiHook } = require("tapable");

this.hooks.allHooks = new MultiHook([this.hooks.hookA, this.hooks.hookB]);