@techmely/utils/emitter.js

Collection of helpful JavaScript / TypeScript utils

/*!
 * @techmely/utils
 * Copyright(c) 2021-2024 Techmely <techmely.creation@gmail.com>
 * MIT Licensed
 */

"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/emitter.ts
var emitter_exports = {};
__export(emitter_exports, {
  default: () => emitter_default,
  emitter: () => emitter
});
module.exports = __toCommonJS(emitter_exports);
function emitter(all) {
  const events = all || /* @__PURE__ */ new Map();
  const getHandlers = (type) => events.get(type);
  function on(type, handler) {
    const handlers = getHandlers(type);
    if (handlers) {
      handlers.push(handler);
    } else {
      events.set(type, [handler]);
    }
  }
  function off(type, handler) {
    const handlers = getHandlers(type);
    if (handlers) {
      if (handler) {
        const indexHandler = handlers.indexOf(handler) >>> 0;
        handlers.splice(indexHandler, 1);
      } else {
        events.set(type, []);
      }
    }
  }
  function emit(type, event) {
    let handlers = getHandlers(type);
    if (handlers) {
      for (const handler of handlers) {
        if (event)
          handler(event);
      }
    }
    handlers = events.get("*");
    if (handlers) {
      for (const handler of handlers) {
        if (event)
          handler(type, event);
      }
    }
  }
  return {
    events,
    on,
    off,
    emit
  };
}
var emitter_default = emitter;
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  emitter
});