@webex/common/dist/events.js

Common utilities for Cisco Webex

"use strict";

var _Object$defineProperty = require("@babel/runtime-corejs2/core-js/object/define-property");
var _interopRequireDefault = require("@babel/runtime-corejs2/helpers/interopRequireDefault");
_Object$defineProperty(exports, "__esModule", {
  value: true
});
exports.proxyEvents = proxyEvents;
exports.transferEvents = transferEvents;
var _apply = _interopRequireDefault(require("@babel/runtime-corejs2/core-js/reflect/apply"));
var _lodash = require("lodash");
/*!
 * Copyright (c) 2015-2020 Cisco Systems, Inc. See LICENSE file.
 */

/**
 * Proxies the event binding methods of emitter onto proxy
 * @param {EventEmitter|EventEmitterProxy} emitter
 * @param {mixed} proxy (probably a promise)
 * @returns {EventEmitter} Returns the source emitter to ease use in promise chains
 */
function proxyEvents(emitter, proxy) {
  ['on', 'once'].forEach(function (key) {
    proxy[key] = function () {
      emitter[key].apply(emitter, arguments);
      return proxy;
    };
  });
  return emitter;
}

/**
 * Given a list of events, fires them on drain when they're emitted from source
 * @param {Array|string} events
 * @param {EventEmitter} source
 * @param {EventEmitter} drain
 * @returns {undefined}
 */
function transferEvents(events, source, drain) {
  events = (0, _lodash.isArray)(events) ? events : [events];
  events.forEach(function (event) {
    if (source.on) {
      source.on(event, function () {
        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }
        return emit.apply(void 0, [drain, event].concat(args));
      });
    }
  });
}

/**
 * Emits an event
 * @param {EventEmitter} target The EventEmitter from which to emit an event
 * @returns {mixed}
 */
function emit(target) {
  var method = target.trigger || target.emit;

  /* istanbul ignore if */
  if (!method) {
    throw new Error('count not determine emit method');
  }
  for (var _len2 = arguments.length, rest = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
    rest[_key2 - 1] = arguments[_key2];
  }
  return (0, _apply.default)(method, target, rest);
}
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