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Allow disabling Strict mode in app #41894

Merged
8 changes: 6 additions & 2 deletions packages/next/client/app-index.tsx
Expand Up @@ -149,6 +149,10 @@ function ServerRoot({ cacheKey }: { cacheKey: string }): JSX.Element {
return root
}

const StrictModeIfEnabled = process.env.__NEXT_STRICT_MODE
? React.StrictMode
: React.Fragment

function Root({ children }: React.PropsWithChildren<{}>): React.ReactElement {
React.useEffect(() => {
measureWebVitals()
Expand Down Expand Up @@ -213,7 +217,7 @@ export function hydrate() {
}

const reactEl = (
<React.StrictMode>
<StrictModeIfEnabled>
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<HeadManagerContext.Provider
value={{
appDir: true,
Expand All @@ -223,7 +227,7 @@ export function hydrate() {
<RSCComponent />
</Root>
</HeadManagerContext.Provider>
</React.StrictMode>
</StrictModeIfEnabled>
)

const isError = document.documentElement.id === '__next_error__'
Expand Down