diff --git a/packages/metro/src/lib/sleep.js b/packages/metro/src/lib/sleep.js
deleted file mode 100644
index d3adb14e..00000000
--- a/packages/metro/src/lib/sleep.js
+++ /dev/null
@@ -1,21 +0,0 @@
-/**
- * Copyright (c) 2015-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- *
- * @flow
- * @format
- */
-
-'use strict';
-
-function sleep(duration: number): Promise<void> {
-  return new Promise(resolve => {
-    setTimeout(resolve, duration);
-  });
-}
-
-module.exports = sleep;