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fix: use == null instead of === undefined for window.event check #36692

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fix: use == null instead of === undefined for window.event check #36692

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3 changes: 2 additions & 1 deletion packages/react-dom-bindings/src/client/ReactDOMUpdatePriority.js
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,8 @@ export function resolveUpdatePriority(): EventPriority {
return updatePriority;
}
const currentEvent = window.event;
if (currentEvent === undefined) {
// IE11 is undefined, IE10 is null
if (currentEvent == null) {
return DefaultEventPriority;
}
return getEventPriority(currentEvent.type);
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