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Move modern strict to experimental #28152

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merged 3 commits into from
Feb 9, 2024
Merged

Move modern strict to experimental #28152

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f552806
Move modern strict to experimental
rickhanlonii Jan 29, 2024
a92a3ac
Turn off strict effects in legacy roots with useModernStrictMode
rickhanlonii Feb 9, 2024
4afefce
Legacy mode never double invokes effects
rickhanlonii Feb 9, 2024
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32 changes: 23 additions & 9 deletions packages/react/src/__tests__/ReactStrictMode-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -116,15 +116,29 @@ describe('ReactStrictMode', () => {
container,
);

expect(log).toEqual([
'constructor',
'constructor',
'getDerivedStateFromProps',
'getDerivedStateFromProps',
'render',
'render',
'componentDidMount',
]);
if (gate(flags => flags.useModernStrictMode)) {
expect(log).toEqual([
'constructor',
'constructor',
'getDerivedStateFromProps',
'getDerivedStateFromProps',
'render',
'render',
'componentDidMount',
'componentWillUnmount',
'componentDidMount',
]);
} else {
expect(log).toEqual([
'constructor',
'constructor',
'getDerivedStateFromProps',
'getDerivedStateFromProps',
'render',
'render',
'componentDidMount',
]);
}

log = [];
shouldComponentUpdate = true;
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2 changes: 1 addition & 1 deletion packages/shared/ReactFeatureFlags.js
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Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,7 @@ export const disableJavaScriptURLs = false;
// Modern <StrictMode /> behaviour aligns more with what components
// components will encounter in production, especially when used With <Offscreen />.
// TODO: clean up legacy <StrictMode /> once tests pass WWW.
export const useModernStrictMode = false;
export const useModernStrictMode = __NEXT_MAJOR__;

// Not ready to break experimental yet.
// Remove IE and MsApp specific workarounds for innerHTML
Expand Down