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Improve error boundary handling for unmounted subtrees #20645

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Jan 25, 2021
Merged

Improve error boundary handling for unmounted subtrees #20645

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170 changes: 170 additions & 0 deletions packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ describe('ReactErrorBoundaries', () => {
PropTypes = require('prop-types');
ReactFeatureFlags = require('shared/ReactFeatureFlags');
ReactFeatureFlags.replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
ReactFeatureFlags.skipUnmountedBoundaries = true;
ReactDOM = require('react-dom');
React = require('react');
act = require('react-dom/test-utils').unstable_concurrentAct;
Expand Down Expand Up @@ -2473,4 +2474,173 @@ describe('ReactErrorBoundaries', () => {
'Caught an error: gotta catch em all.',
);
});

it('catches errors thrown in componentWillUnmount', () => {
class LocalErrorBoundary extends React.Component {
state = {error: null};
static getDerivedStateFromError(error) {
Scheduler.unstable_yieldValue(
`ErrorBoundary static getDerivedStateFromError`,
);
return {error};
}
render() {
const {children, id, fallbackID} = this.props;
const {error} = this.state;
if (error) {
Scheduler.unstable_yieldValue(`${id} render error`);
return <Component id={fallbackID} />;
}
Scheduler.unstable_yieldValue(`${id} render success`);
return children || null;
}
}

class Component extends React.Component {
render() {
const {id} = this.props;
Scheduler.unstable_yieldValue('Component render ' + id);
return id;
}
}

class LocalBrokenComponentWillUnmount extends React.Component {
componentWillUnmount() {
Scheduler.unstable_yieldValue(
'BrokenComponentWillUnmount componentWillUnmount',
);
throw Error('Expected');
}

render() {
Scheduler.unstable_yieldValue('BrokenComponentWillUnmount render');
return 'broken';
}
}

const container = document.createElement('div');

ReactDOM.render(
<LocalErrorBoundary id="OuterBoundary" fallbackID="OuterFallback">
<Component id="sibling" />
<LocalErrorBoundary id="InnerBoundary" fallbackID="InnerFallback">
<LocalBrokenComponentWillUnmount />
</LocalErrorBoundary>
</LocalErrorBoundary>,
container,
);

expect(container.firstChild.textContent).toBe('sibling');
expect(container.lastChild.textContent).toBe('broken');
expect(Scheduler).toHaveYielded([
'OuterBoundary render success',
'Component render sibling',
'InnerBoundary render success',
'BrokenComponentWillUnmount render',
]);

ReactDOM.render(
<LocalErrorBoundary id="OuterBoundary" fallbackID="OuterFallback">
<Component id="sibling" />
</LocalErrorBoundary>,
container,
);

// React should skip over the unmounting boundary and find the nearest still-mounted boundary.
expect(container.firstChild.textContent).toBe('OuterFallback');
expect(container.lastChild.textContent).toBe('OuterFallback');
expect(Scheduler).toHaveYielded([
'OuterBoundary render success',
'Component render sibling',
'BrokenComponentWillUnmount componentWillUnmount',
'ErrorBoundary static getDerivedStateFromError',
'OuterBoundary render error',
'Component render OuterFallback',
]);
});

it('catches errors thrown while detaching refs', () => {
class LocalErrorBoundary extends React.Component {
state = {error: null};
static getDerivedStateFromError(error) {
Scheduler.unstable_yieldValue(
`ErrorBoundary static getDerivedStateFromError`,
);
return {error};
}
render() {
const {children, id, fallbackID} = this.props;
const {error} = this.state;
if (error) {
Scheduler.unstable_yieldValue(`${id} render error`);
return <Component id={fallbackID} />;
}
Scheduler.unstable_yieldValue(`${id} render success`);
return children || null;
}
}

class Component extends React.Component {
render() {
const {id} = this.props;
Scheduler.unstable_yieldValue('Component render ' + id);
return id;
}
}

class LocalBrokenCallbackRef extends React.Component {
_ref = ref => {
Scheduler.unstable_yieldValue('LocalBrokenCallbackRef ref ' + !!ref);
if (ref === null) {
throw Error('Expected');
}
};

render() {
Scheduler.unstable_yieldValue('LocalBrokenCallbackRef render');
return <div ref={this._ref}>ref</div>;
}
}

const container = document.createElement('div');

ReactDOM.render(
<LocalErrorBoundary id="OuterBoundary" fallbackID="OuterFallback">
<Component id="sibling" />
<LocalErrorBoundary id="InnerBoundary" fallbackID="InnerFallback">
<LocalBrokenCallbackRef />
</LocalErrorBoundary>
</LocalErrorBoundary>,
container,
);

expect(container.firstChild.textContent).toBe('sibling');
expect(container.lastChild.textContent).toBe('ref');
expect(Scheduler).toHaveYielded([
'OuterBoundary render success',
'Component render sibling',
'InnerBoundary render success',
'LocalBrokenCallbackRef render',
'LocalBrokenCallbackRef ref true',
]);

ReactDOM.render(
<LocalErrorBoundary id="OuterBoundary" fallbackID="OuterFallback">
<Component id="sibling" />
</LocalErrorBoundary>,
container,
);

// React should skip over the unmounting boundary and find the nearest still-mounted boundary.
expect(container.firstChild.textContent).toBe('OuterFallback');
expect(container.lastChild.textContent).toBe('OuterFallback');
expect(Scheduler).toHaveYielded([
'OuterBoundary render success',
'Component render sibling',
'LocalBrokenCallbackRef ref false',
'ErrorBoundary static getDerivedStateFromError',
'OuterBoundary render error',
'Component render OuterFallback',
]);
});
});
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