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Fix development mode hang when iframe is removed #19220

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merged 2 commits into from Jul 1, 2020
Merged

Fix development mode hang when iframe is removed #19220

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10ae68a
Fix development mode hang when iframe is removed
gaearon Jun 30, 2020
af57488
Also fix #16734
gaearon Jun 30, 2020
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18 changes: 11 additions & 7 deletions packages/shared/invokeGuardedCallbackImpl.js
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Expand Up @@ -116,12 +116,7 @@ if (__DEV__) {
'event',
);

// Create an event handler for our fake event. We will synchronously
// dispatch our fake event using `dispatchEvent`. Inside the handler, we
// call the user-provided callback.
const funcArgs = Array.prototype.slice.call(arguments, 3);
function callCallback() {
didCall = true;
function restoreAfterDispatch() {
// We immediately remove the callback from event listeners so that
// nested `invokeGuardedCallback` calls do not clash. Otherwise, a
// nested call would trigger the fake event handlers of any call higher
Expand All @@ -138,7 +133,15 @@ if (__DEV__) {
) {
window.event = windowEvent;
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I wonder why this doesn't do

if (windowEventDescriptor) {
    Object.defineProperty(window, 'event', windowEventDescriptor);
}

as below.

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I'm scared to touch it. #11696 (comment)

}
}

// Create an event handler for our fake event. We will synchronously
// dispatch our fake event using `dispatchEvent`. Inside the handler, we
// call the user-provided callback.
const funcArgs = Array.prototype.slice.call(arguments, 3);
function callCallback() {
didCall = true;
restoreAfterDispatch();
func.apply(context, funcArgs);
didError = false;
}
Expand Down Expand Up @@ -195,7 +198,7 @@ if (__DEV__) {
Object.defineProperty(window, 'event', windowEventDescriptor);
}

if (didError) {
if (didCall && didError) {
if (!didSetError) {
// The callback errored, but the error event never fired.
error = new Error(
Expand Down Expand Up @@ -226,6 +229,7 @@ if (__DEV__) {
// https://github.com/facebook/react/issues/16734
// https://github.com/facebook/react/issues/16585
// Fall back to the production implementation.
restoreAfterDispatch();
return invokeGuardedCallbackProd.apply(this, arguments);
}
};
Expand Down