From 8c75c214d7ed22692d901b4d798b7165fa5fae71 Mon Sep 17 00:00:00 2001
From: jgw96 <jgw9617@gmail.com>
Date: Tue, 7 Mar 2017 16:12:02 -0600
Subject: [PATCH] chore(util): add requestIdleCallback polyfill

---
 src/util/test/util.spec.ts | 8 ++++++++
 src/util/util.ts           | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/util/test/util.spec.ts b/src/util/test/util.spec.ts
index 91def51a34..301086d7b8 100644
--- a/src/util/test/util.spec.ts
+++ b/src/util/test/util.spec.ts
@@ -340,4 +340,12 @@ describe('util', () => {
 
   });
 
+  describe('requestIdleCallback polyfill', () => {
+
+    it('should return a value lazily', () => {
+      expect(util.requestIonicCallback(() => { return 1; })).toEqual(1);
+    });
+
+  });
+
 });
diff --git a/src/util/util.ts b/src/util/util.ts
index b2fb6488e8..070665399a 100644
--- a/src/util/util.ts
+++ b/src/util/util.ts
@@ -179,6 +179,15 @@ function _assert(actual: any, reason: string) {
   }
 }
 
+/** @private */
+export function requestIonicCallback(functionToLazy: any) {
+  if ('requestIdleCallback' in window) {
+    return (window as any).requestIdleCallback(functionToLazy);
+  } else {
+    return setTimeout(functionToLazy, 500);
+  }
+}
+
 /** @private */
 export { _assert as assert};