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Allow disabling Strict mode in app #41894

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merged 10 commits into from Oct 28, 2022
Merged

Allow disabling Strict mode in app #41894

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78270ac
Allow disabling Strict mode in app
timneutkens Oct 26, 2022
8cc4437
Use simpler component
timneutkens Oct 26, 2022
3f108cd
Remove unused import
timneutkens Oct 26, 2022
6f598f9
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
ijjk Oct 27, 2022
11a6fd7
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
kodiakhq[bot] Oct 27, 2022
a58ba30
Enable strict mode by default for app dir
timneutkens Oct 27, 2022
7c11431
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
kodiakhq[bot] Oct 27, 2022
2e5267e
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
kodiakhq[bot] Oct 27, 2022
cf67ec9
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
kodiakhq[bot] Oct 27, 2022
2661204
Merge branch 'canary' into add/allow-disabling-strictmode-in-app2
kodiakhq[bot] Oct 27, 2022
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14 changes: 11 additions & 3 deletions packages/next/client/app-index.tsx
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Expand Up @@ -2,7 +2,7 @@
import '../build/polyfills/polyfill-module'
// @ts-ignore react-dom/client exists when using React 18
import ReactDOMClient from 'react-dom/client'
import React, { use } from 'react'
import React, { ReactNode, use } from 'react'
import { createFromReadableStream } from 'next/dist/compiled/react-server-dom-webpack/client'

import measureWebVitals from './performance-relayer'
Expand Down Expand Up @@ -149,6 +149,14 @@ function ServerRoot({ cacheKey }: { cacheKey: string }): JSX.Element {
return root
}

function StrictModeIfEnabled({ children }: { children: React.ReactNode }) {
return process.env.__NEXT_STRICT_MODE ? (
<React.StrictMode>{children}</React.StrictMode>
) : (
<>{children}</>
)
}

function Root({ children }: React.PropsWithChildren<{}>): React.ReactElement {
React.useEffect(() => {
measureWebVitals()
Expand Down Expand Up @@ -213,7 +221,7 @@ export function hydrate() {
}

const reactEl = (
<React.StrictMode>
<StrictModeIfEnabled>
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<HeadManagerContext.Provider
value={{
appDir: true,
Expand All @@ -223,7 +231,7 @@ export function hydrate() {
<RSCComponent />
</Root>
</HeadManagerContext.Provider>
</React.StrictMode>
</StrictModeIfEnabled>
)

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