Add definitions for gulp-useref (https://github.com/jonkemp/gulp-useref)

gulp-useref/gulp-useref-tests.ts

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+/// <reference path="gulp-useref.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+import gulp = require('gulp');
+import useref = require('gulp-useref');
+
+gulp.task('default', () => {
+    var assets = useref.assets();
+
+    return gulp.src('app/*.html')
+        .pipe(assets)
+        .pipe(assets.restore())
+        .pipe(useref())
+        .pipe(gulp.dest('dist'));
+});

gulp-useref/gulp-useref.d.ts

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+// Type definitions for gulp-useref v1.2.0
+// Project: https://github.com/jonkemp/gulp-useref
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module 'gulp-useref' {
+    interface IAssetsOptions {
+        searchPath?: string | string[];
+        noconcat?: boolean;
+    }
+
+    interface IAssetsStream extends NodeJS.ReadWriteStream {
+        restore(): NodeJS.ReadWriteStream;
+    }
+
+    interface IUseref {
+        (options?: any): NodeJS.ReadWriteStream;
+        assets(options?: IAssetsOptions): IAssetsStream;
+    }
+
+    var useref: IUseref;
+    export = useref;
+}