"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.ts
var src_exports = {};
__export(src_exports, {
  EventEmitter: () => EventEmitter
});
module.exports = __toCommonJS(src_exports);

// 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);
      });
    }
  }
};
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  EventEmitter
});
//# sourceMappingURL=index.cjs.map