Configring node js.

node_modules/jszip/lib/stream/Crc32Probe.js

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+'use strict';
+
+var GenericWorker = require('./GenericWorker');
+var crc32 = require('../crc32');
+var utils = require('../utils');
+
+/**
+ * A worker which calculate the crc32 of the data flowing through.
+ * @constructor
+ */
+function Crc32Probe() {
+    GenericWorker.call(this, "Crc32Probe");
+    this.withStreamInfo("crc32", 0);
+}
+utils.inherits(Crc32Probe, GenericWorker);
+
+/**
+ * @see GenericWorker.processChunk
+ */
+Crc32Probe.prototype.processChunk = function (chunk) {
+    this.streamInfo.crc32 = crc32(chunk.data, this.streamInfo.crc32 || 0);
+    this.push(chunk);
+};
+module.exports = Crc32Probe;