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Ensure "addEventListener" exists on "window" for "scheduler" package #13731

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Merged
merged 4 commits into from
Sep 26, 2018
Merged

Ensure "addEventListener" exists on "window" for "scheduler" package #13731

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6553e50
Ensure addEventListener exists on "window"
trueadm Sep 26, 2018
f968b84
Update conditional as per feedback
trueadm Sep 26, 2018
1e99062
fix typo
trueadm Sep 26, 2018
c35bf9f
run prettier
trueadm Sep 26, 2018
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8 changes: 6 additions & 2 deletions packages/scheduler/src/Scheduler.js
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Original file line number Diff line number Diff line change
Expand Up @@ -573,8 +573,12 @@ if (typeof window === 'undefined') {
}
};
// Assumes that we have addEventListener in this environment. Might need
// something better for old IE.
window.addEventListener('message', idleTick, false);
// something better for old IE. Furthermore, "addEventListener" might not
// be available on the window object (if this is a RN mocked window),
// so we should check that it's a function before attaching the listener.
if (typeof window.addEventListener === 'function') {
window.addEventListener('message', idleTick, false);
}

var animationTick = function(rafTime) {
isAnimationFrameScheduled = false;
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