@tdb/web/debug.js/node_modules/next/dist/lib/EventEmitter.js

Common condiguration for serving a web-site and testing web-based UI components.

"use strict";

var _interopRequireDefault = require("@babel/runtime-corejs2/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _set = _interopRequireDefault(require("@babel/runtime-corejs2/core-js/set"));

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime-corejs2/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime-corejs2/helpers/createClass"));

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime-corejs2/helpers/defineProperty"));

var EventEmitter =
/*#__PURE__*/
function () {
  function EventEmitter() {
    (0, _classCallCheck2.default)(this, EventEmitter);
    (0, _defineProperty2.default)(this, "listeners", {});
  }

  (0, _createClass2.default)(EventEmitter, [{
    key: "on",
    value: function on(event, cb) {
      if (!this.listeners[event]) {
        this.listeners[event] = new _set.default();
      }

      if (this.listeners[event].has(cb)) {
        throw new Error("The listener already exising in event: ".concat(event));
      }

      this.listeners[event].add(cb);
      return this;
    }
  }, {
    key: "emit",
    value: function emit(event) {
      for (var _len = arguments.length, data = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        data[_key - 1] = arguments[_key];
      }

      var listeners = this.listeners[event];
      var hasListeners = listeners && listeners.size;

      if (!hasListeners) {
        return false;
      }

      listeners.forEach(function (cb) {
        return cb.apply(void 0, data);
      }); // eslint-disable-line standard/no-callback-literal

      return true;
    }
  }, {
    key: "off",
    value: function off(event, cb) {
      this.listeners[event].delete(cb);
      return this;
    }
  }]);
  return EventEmitter;
}();

exports.default = EventEmitter;