Add batch-stream definitions

batch-stream/batch-stream-tests.ts

@@ -0,0 +1,12 @@
+/// <reference path="../node/node.d.ts" />
+/// <reference path="batch-stream.d.ts" />
+
+import fs = require('fs');
+import BatchStream = require('batch-stream');
+
+var batch = new BatchStream({ size : 5 });
+var stream = fs.createReadStream('/etc/passwd');
+
+stream
+  .pipe(batch)
+  .pipe(fs.createWriteStream('./test.out')); // deals with array input from pipe.

batch-stream/batch-stream.d.ts

@@ -0,0 +1,24 @@
+// Type definitions for batch-stream 0.1.2
+// Project: https://github.com/segmentio/batch-stream
+// Definitions by: Nicholas Penree <http://github.com/drudge>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "batch-stream" {
+  import stream = require('stream');
+
+  interface Options {
+    size?: number;
+    highWaterMark?: number;
+  }
+
+  class BatchStream extends stream.Transform {
+    size: number;
+    batch: any[];
+
+    constructor(options: Options);
+  }
+
+  export = BatchStream;
+}