Add typing for barcode

barcode/barcode-tests.ts

@@ -0,0 +1,22 @@
+/// <reference path="barcode.d.ts" />
+import barcode = require('barcode');
+import path = require('path');
+
+var code39 = barcode('code39', {
+    data: "it works",
+    width: 400,
+    height: 100,
+});
+
+code39.getStream(function (err, readStream) {
+    if (err) throw err;
+
+    // 'readStream' is an instance of ReadableStream
+});
+
+var outfile = path.join(__dirname, 'imgs', 'mycode.png');
+code39.saveImage(outfile, function (err) {
+    if (err) throw err;
+
+    console.log('File has been written!');
+});

barcode/barcode.d.ts

@@ -0,0 +1,25 @@
+// Type definitions for barcode
+// Project: https://github.com/samt/barcode
+// Definitions by: Pascal Vomhoff <https://github.com/pvomhoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "barcode" {
+
+    interface BarcodeOptions {
+        data:string|number;
+        width:number;
+        height:number;
+    }
+
+    interface BarcodeResult {
+        getStream(callback:(err:NodeJS.ErrnoException, stream:NodeJS.ReadableStream) => void):void;
+        saveImage(outputfilePath:string, callback:(err:NodeJS.ErrnoException) => void):void;
+        getBase64(callback:(err:NodeJS.ErrnoException, base64String:string) => void):void;
+    }
+
+    function barcode(type:string, options:BarcodeOptions):BarcodeResult;
+
+    export = barcode;
+}