diff --git a/gulp-espower/gulp-espower-tests.ts b/gulp-espower/gulp-espower-tests.ts
new file mode 100644
index 0000000000..9240ee82d9
--- /dev/null
+++ b/gulp-espower/gulp-espower-tests.ts
@@ -0,0 +1,15 @@
+/// <reference path="gulp-espower.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+
+import espower = require('gulp-espower');
+import * as gulp from 'gulp';
+
+gulp.src('src/*.coffee')
+    .pipe(espower())
+    .pipe(gulp.dest('out'));
+
+
+gulp.src('src/*.coffee')
+    .pipe(espower({ patterns: ['assert(value, [message])'] }))
+    .pipe(gulp.dest('out'));
diff --git a/gulp-espower/gulp-espower.d.ts b/gulp-espower/gulp-espower.d.ts
new file mode 100644
index 0000000000..984afad9ca
--- /dev/null
+++ b/gulp-espower/gulp-espower.d.ts
@@ -0,0 +1,27 @@
+// Type definitions for gulp-espower
+// Project: https://github.com/power-assert-js/gulp-espower
+// Definitions by: Qubo <https://github.com/tkQubo>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "gulp-espower" {
+
+    namespace espower {
+        interface Espower {
+            /**
+             * @param options Target patterns for power assert feature instrumentation.
+             */
+            (options?: Options): NodeJS.ReadWriteStream;
+        }
+
+        interface Options {
+            patterns: string[];
+        }
+    }
+
+    var espower: espower.Espower;
+
+    export = espower;
+}
+