node_modules/jszip/lib/external.js

/* global Promise */
'use strict';

// load the global object first:
// - it should be better integrated in the system (unhandledRejection in node)
// - the environment may have a custom Promise implementation (see zone.js)
var ES6Promise = null;
if (typeof Promise !== "undefined") {
    ES6Promise = Promise;
} else {
    ES6Promise = require("lie");
}

/**
 * Let the user use/change some implementations.
 */
module.exports = {
    Promise: ES6Promise
};