require() pako lazily

Author: GarboMuffin

lib/flate.js

@@ -1,7 +1,6 @@
 "use strict";
 var USE_TYPEDARRAY = (typeof Uint8Array !== "undefined") && (typeof Uint16Array !== "undefined") && (typeof Uint32Array !== "undefined");
 
-var pako = require("pako");
 var utils = require("./utils");
 var GenericWorker = require("./stream/GenericWorker");
 
@@ -64,6 +63,7 @@ FlateWorker.prototype.cleanUp = function () {
  * issue #446.
  */
 FlateWorker.prototype._createPako = function () {
+    var pako = require("pako");
     this._pako = new pako[this._pakoAction]({
         chunkSize: 65536,
         raw: true,