Add definitions for merge2 (https://github.com/teambition/merge2)

merge2/merge2-tests.ts

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+/// <reference path="merge2.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+import gulp = require('gulp');
+import merge2 = require('merge2');
+
+gulp.task('app-js', () =>
+  merge2(
+      gulp.src('static/src/tpl/*.html'),
+      gulp.src([
+        'static/src/js/app.js',
+        'static/src/js/locale_zh-cn.js',
+        'static/src/js/router.js',
+        'static/src/js/tools.js',
+        'static/src/js/services.js',
+        'static/src/js/filters.js',
+        'static/src/js/directives.js',
+        'static/src/js/controllers.js'
+      ])
+    )
+    .pipe(gulp.dest('static/dist/js/'))
+);
+
+
+var stream1 = gulp.src('*.html');
+var stream2 = gulp.src('*.html');
+var stream3 = gulp.src('*.html');
+var stream4 = gulp.src('*.html');
+var stream5 = gulp.src('*.html');
+var stream6 = gulp.src('*.html');
+var stream7 = gulp.src('*.html');
+
+
+var stream = merge2([stream1, stream2], stream3, {end: false})
+//...
+stream.add(stream4, stream5);
+//..
+stream.end();
+
+
+// equal to merge2([stream1, stream2], stream3)
+var stream = merge2();
+stream.add([stream1, stream2]);
+stream.add(stream3);
+
+
+// merge order:
+//   1. merge `stream1`;
+//   2. merge `stream2` and `stream3` in parallel after `stream1` merged;
+//   3. merge 'stream4' after `stream2` and `stream3` merged;
+var stream = merge2(stream1, [stream2, stream3], stream4);
+
+// merge order:
+//   1. merge `stream5` and `stream6` in parallel after `stream4` merged;
+//   2. merge 'stream7' after `stream5` and `stream6` merged;
+stream.add([stream5, stream6], stream7);
+
+
+// nest merge
+// equal to merge2(stream1, stream2, stream6, stream3, [stream4, stream5]);
+var streamA = merge2(stream1, stream2);
+var streamB = merge2(stream3, [stream4, stream5]);
+var stream = merge2(streamA, streamB);
+streamA.add(stream6);

merge2/merge2.d.ts

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+// Type definitions for merge2 v0.3.6
+// Project: https://github.com/teambition/merge2
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module 'merge2' {
+    interface IOptions {
+        end?: boolean;
+        objectMode?: boolean;
+    }
+
+    interface IMerge2Stream extends NodeJS.ReadWriteStream {
+      add(...args: Array<NodeJS.ReadWriteStream | IMerge2Stream | Array<NodeJS.ReadWriteStream | IMerge2Stream | IOptions>>): IMerge2Stream;
+    }
+
+    function merge2(...args: Array<NodeJS.ReadWriteStream | IMerge2Stream | Array<NodeJS.ReadWriteStream | IMerge2Stream> | IOptions>): IMerge2Stream;
+
+    export = merge2;
+}