Configring node js.

node_modules/jszip/lib/index.js

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+'use strict';
+
+/**
+ * Representation a of zip file in js
+ * @constructor
+ */
+function JSZip() {
+    // if this constructor is used without `new`, it adds `new` before itself:
+    if(!(this instanceof JSZip)) {
+        return new JSZip();
+    }
+
+    if(arguments.length) {
+        throw new Error("The constructor with parameters has been removed in JSZip 3.0, please check the upgrade guide.");
+    }
+
+    // object containing the files :
+    // {
+    //   "folder/" : {...},
+    //   "folder/data.txt" : {...}
+    // }
+    this.files = {};
+
+    this.comment = null;
+
+    // Where we are in the hierarchy
+    this.root = "";
+    this.clone = function() {
+        var newObj = new JSZip();
+        for (var i in this) {
+            if (typeof this[i] !== "function") {
+                newObj[i] = this[i];
+            }
+        }
+        return newObj;
+    };
+}
+JSZip.prototype = require('./object');
+JSZip.prototype.loadAsync = require('./load');
+JSZip.support = require('./support');
+JSZip.defaults = require('./defaults');
+
+// TODO find a better way to handle this version,
+// a require('package.json').version doesn't work with webpack, see #327
+JSZip.version = "3.1.5";
+
+JSZip.loadAsync = function (content, options) {
+    return new JSZip().loadAsync(content, options);
+};
+
+JSZip.external = require("./external");
+module.exports = JSZip;