feat(hooks): client-side hooks module

Similar to server-side, comes with three hook types, filter, action, and static. Behaviour also mimics server-side.

public/src/modules/hooks.js

@@ -0,0 +1,45 @@
+'use strict';
+
+define('hooks', [], () => {
+	const Hooks = {
+		loaded: {},
+	};
+
+	Hooks.register = (hookName, listener) => {
+		Hooks.loaded[hookName] = Hooks.loaded[hookName] || new Set();
+		Hooks.loaded[hookName].add(listener);
+	};
+
+	Hooks.hasListeners = hookName => Hooks.loaded[hookName] && Hooks.loaded[hookName].length > 0;
+
+	const _fireFilterHook = (hookName, data) => {
+		const listeners = Array.from(Hooks.loaded[hookName]);
+		return listeners.reduce((promise, listener) => promise.then(data => listener(data)), Promise.resolve(data));
+	};
+
+	const _fireActionHook = (hookName, data) => {
+		Hooks.loaded[hookName].forEach(listener => listener(data));
+	};
+
+	const _fireStaticHook = (hookName, data) => {
+		const listeners = Array.from(Hooks.loaded[hookName]);
+		return Promise.allSettled(listeners.map(listener => listener(data))).then(() => Promise.resolve(data));
+	};
+
+	Hooks.fire = (hookName, data) => {
+		const type = hookName.split(':').shift();
+
+		switch (type) {
+			case 'filter':
+				return _fireFilterHook(hookName, data);
+
+			case 'action':
+				return _fireActionHook(hookName, data);
+
+			case 'static':
+				return _fireStaticHook(hookName, data);
+		}
+	};
+
+	return Hooks;
+});