wavesurfer.js
Version:
Navigable audio waveform player
20 lines (19 loc) • 1.11 kB
TypeScript
export type GeneralEventTypes = {
[EventName: string]: any[];
};
type EventListener<EventTypes extends GeneralEventTypes, EventName extends keyof EventTypes> = (...args: EventTypes[EventName]) => void;
/** A simple event emitter that can be used to listen to and emit events. */
declare class EventEmitter<EventTypes extends GeneralEventTypes> {
private listeners;
/** Subscribe to an event. Returns an unsubscribe function. */
on<EventName extends keyof EventTypes>(eventName: EventName, listener: EventListener<EventTypes, EventName>): () => void;
/** Subscribe to an event only once */
once<EventName extends keyof EventTypes>(eventName: EventName, listener: EventListener<EventTypes, EventName>): () => void;
/** Unsubscribe from an event */
un<EventName extends keyof EventTypes>(eventName: EventName, listener: EventListener<EventTypes, EventName>): void;
/** Clear all events */
unAll(): void;
/** Emit an event */
protected emit<EventName extends keyof EventTypes>(eventName: EventName, ...args: EventTypes[EventName]): void;
}
export default EventEmitter;