more specific check for function type (rAF and cAF)

Check specifically that requestAnimationFrame and cancelAnimationFrame are functions, and not just that they are truthy.
facebook · Sep 10, 2019 · 0562fb5 · 0562fb5
1 parent 2dc1147
commit 0562fb5
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/packages/scheduler/src/forks/SchedulerHostConfig.default.js b/packages/scheduler/src/forks/SchedulerHostConfig.default.js
@@ -86,9 +86,13 @@ if (
   // Explicitly bind local references to `window`, in order to support
   // environments where the global `this` is not the window (e.g extensions)
   const requestAnimationFrame =
-    window.requestAnimationFrame && window.requestAnimationFrame.bind(window);
+    typeof window.requestAnimationFrame === 'function'
+      ? window.requestAnimationFrame.bind(window)
+      : undefined;
   const cancelAnimationFrame =
-    window.cancelAnimationFrame && window.cancelAnimationFrame.bind(window);
+    typeof window.cancelAnimationFrame === 'function'
+      ? window.cancelAnimationFrame.bind(window)
+      : undefined;
 
   if (typeof console !== 'undefined') {
     // TODO: Remove fb.me link