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Type Emitter

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This commit is contained in:
Jordan Eldredge 2018-09-17 08:32:52 -07:00
parent 76187eb0cd
commit b4a48d57b8
1 changed files with 8 additions and 6 deletions
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14
js/emitter.js → js/emitter.ts
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@ -1,5 +1,11 @@
export default class Emitter {
on(event, callback) {
_listeners: { [event: string]: Array<(...args: any[]) => void> };
constructor() {
this._listeners = {};
}
on(event: string, callback: (...args: any[]) => void) {
const eventListeners = this._listeners[event] || [];
eventListeners.push(callback);
this._listeners[event] = eventListeners;
@ -9,14 +15,10 @@ export default class Emitter {
return unsubscribe;
}
trigger(event, ...args) {
trigger(event: string, ...args: any[]) {
const callbacks = this._listeners[event];
if (callbacks) {
callbacks.forEach(cb => cb(...args));
}
}
constructor() {
this._listeners = {};
}
}