@posva/event-emitter/dist/index.js

Type safe and light event emitter / pubsub class

// src/event-emitter.ts
var EventEmitter = class {
  /**
   * A Map of event names to registered handler functions.
   */
  all;
  constructor(all) {
    this.all = all || /* @__PURE__ */ new Map();
  }
  on(type, handler) {
    if (!this.all.has(type)) {
      this.all.set(type, []);
    }
    const handlers = this.all.get(type);
    handlers.push(handler);
    return () => handlers.splice(handlers.indexOf(handler) >>> 0, 1);
  }
  off(type, handler) {
    if (!type) {
      return this.all.clear();
    }
    const handlers = this.all.get(type);
    if (handlers) {
      if (handler) {
        handlers.splice(handlers.indexOf(handler) >>> 0, 1);
      } else {
        this.all.delete(type);
      }
    }
  }
  /**
   * Invoke all handlers for the given type.
   * If present, `'*'` handlers are invoked after type-matched handlers.
   *
   * Note: Manually firing `'*'` handlers is not supported.
   *
   * @param type The event type to invoke
   * @param payload Any value to each handler
   */
  emit(type, ...payload) {
    let handlers = this.all.get(type);
    handlers?.slice().map((handler) => {
      handler(...payload);
    });
    handlers = this.all.get("*");
    if (handlers) {
      handlers.slice().map((handler) => {
        handler(type, payload);
      });
    }
  }
};
export {
  EventEmitter
};
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