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Regression test: Stylesheet suspends indefinitely when part of error boundary UI during initial hydration #27258

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Aug 21, 2023
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Regression test: Stylesheet suspends indefinitely when part of error boundary UI during initial hydration #27258

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87 changes: 87 additions & 0 deletions packages/react-dom/src/__tests__/ReactDOMFloat-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3385,6 +3385,93 @@ body {
);
});

// @gate FIXME
it('loading a stylesheet as part of an error boundary UI, during initial render', async () => {
class ErrorBoundary extends React.Component {
state = {error: null};
static getDerivedStateFromError(error) {
return {error};
}
render() {
const error = this.state.error;
if (error !== null) {
return (
<>
<link rel="stylesheet" href="A" precedence="default" />
{error.message}
</>
);
}
return this.props.children;
}
}

function Throws() {
throw new Error('Oops!');
}

function App() {
return (
<html>
<body>
<ErrorBoundary>
<Suspense fallback="Loading...">
<Throws />
</Suspense>
</ErrorBoundary>
</body>
</html>
);
}

// Initial server render. Because something threw, a Suspense fallback
// is shown.
await act(() => {
renderToPipeableStream(<App />, {
onError(x) {
Scheduler.log('Caught server error: ' + x.message);
},
}).pipe(writable);
});
expect(getMeaningfulChildren(document)).toEqual(
<html>
<head />
<body>Loading...</body>
</html>,
);
assertLog(['Caught server error: Oops!']);

// Hydrate the tree. The error boundary will capture the error and attempt
// to show an error screen. However, the error screen includes a stylesheet,
// so the commit should suspend until the stylesheet loads.
ReactDOMClient.hydrateRoot(document, <App />);
await waitForAll([]);

// A preload for the stylesheet is inserted, but we still haven't committed
// the error screen.
expect(getMeaningfulChildren(document)).toEqual(
<html>
<head>
<link as="style" href="A" rel="preload" />
</head>
<body>Loading...</body>
</html>,
);

// Finish loading the stylesheets. The commit should be unblocked, and the
// error screen should appear.
await clientAct(() => loadStylesheets());
expect(getMeaningfulChildren(document)).toEqual(
<html>
<head>
<link data-precedence="default" href="A" rel="stylesheet" />
<link as="style" href="A" rel="preload" />
</head>
<body>Oops!</body>
</html>,
);
});

it('will not flush a preload for a new rendered Stylesheet Resource if one was already flushed', async () => {
function Component() {
ReactDOM.preload('foo', {as: 'style'});
Expand Down