From 1ef1272d6dbe8fbcc2d08223cd80ef32ce28a9c9 Mon Sep 17 00:00:00 2001
From: xobotyi <xog3@yandex.ru>
Date: Wed, 1 Apr 2020 08:49:05 +0300
Subject: [PATCH] feat(useRafLoop): implement #1090

---
 docs/useRafLoop.md        |  2 +-
 src/useRafLoop.ts         |  5 ++---
 tests/useRafLoop.test.tsx | 16 ++++++++++++++++
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/docs/useRafLoop.md b/docs/useRafLoop.md
index f124385b..978c5587 100644
--- a/docs/useRafLoop.md
+++ b/docs/useRafLoop.md
@@ -31,5 +31,5 @@ const Demo = () => {
 ```ts
 const [stopLoop, isActive, startLoop] = useRafLoop(callback: CallableFunction, deps?: DependencyList);
 ```
-* `callback` &mdash; function to call each RAF tick
+* `callback(time: number)` &mdash; function to call each RAF tick
 
diff --git a/src/useRafLoop.ts b/src/useRafLoop.ts
index 0eafd9a9..9760ea6b 100644
--- a/src/useRafLoop.ts
+++ b/src/useRafLoop.ts
@@ -1,4 +1,3 @@
-/* eslint-disable */
 import { useEffect, useRef, useState } from 'react';
 
 export type RafLoopReturns = [() => void, boolean, () => void];
@@ -7,8 +6,8 @@ export default function useRafLoop(callback: CallableFunction): RafLoopReturns {
   const raf = useRef<number | null>(null);
   const [isActive, setIsActive] = useState<boolean>(true);
 
-  function loopStep() {
-    callback();
+  function loopStep(time: number) {
+    callback(time);
     raf.current = requestAnimationFrame(loopStep);
   }
 
diff --git a/tests/useRafLoop.test.tsx b/tests/useRafLoop.test.tsx
index 844c7879..36f7d446 100644
--- a/tests/useRafLoop.test.tsx
+++ b/tests/useRafLoop.test.tsx
@@ -99,4 +99,20 @@ describe('useRafLoop', () => {
 
     expect(spy).not.toBeCalled();
   });
+
+  it('should pass timestamp as 1st argument of callback', () => {
+    const spy = jest.fn();
+    const hook = renderHook(() => useRafLoop(spy), { initialProps: false });
+
+    requestAnimationFrame.step();
+
+    act(() => {
+      hook.result.current[0]();
+    });
+
+    requestAnimationFrame.step();
+
+    expect(spy).toHaveBeenCalled();
+    expect(typeof spy.mock.calls[0][0]).toBe('number');
+  });
 });