# all files / packages/web3-core-promiEvent/src/ index.js

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     /*
     This file is part of web3.js.

     web3.js is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.

     web3.js is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public License
     along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
     */
    /**
     * @file index.js
     * @author Fabian Vogelsteller <fabian@ethereum.org>
     * @date 2016
     */

    "use strict";

    var EventEmitter = require('eventemitter3');
    var Promise = require("bluebird");

    /**
     * This function generates a defer promise and adds eventEmitter functionality to it
     *
     * @method eventifiedPromise
     */
    var PromiEvent = function PromiEvent(justPromise) {
        var resolve, reject,
            eventEmitter = new Promise(function() {
                resolve = arguments[0];
                reject = arguments[1];
            });

        if(justPromise) {
            return {
                resolve: resolve,
                reject: reject,
                eventEmitter: eventEmitter
            };
        }

        // get eventEmitter
        var emitter = new EventEmitter();

        // add eventEmitter to the promise
        eventEmitter._events = emitter._events;
        eventEmitter.emit = emitter.emit;
        eventEmitter.on = emitter.on;
        eventEmitter.once = emitter.once;
        eventEmitter.off = emitter.off;
        eventEmitter.listeners = emitter.listeners;
        eventEmitter.addListener = emitter.addListener;
        eventEmitter.removeListener = emitter.removeListener;
        eventEmitter.removeAllListeners = emitter.removeAllListeners;

        return {
            resolve: resolve,
            reject: reject,
            eventEmitter: eventEmitter
        };
    };

    module.exports = PromiEvent;