[rcr] Re-export useMemoCache in top level React namespace #31139
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In order to support using the compiler on versions of React prior to 19, we need the ability to statically import `c` (aka useMemoCache) or fallback to a polyfill supplied by `react-compiler-runtime` (note: this is a separate npm package, not to be confused with `react/compiler-runtime`, which is currently a part of react). To do this we first need to re-export `useMemoCache` under the top level React namespace again, which is additive and thus non-breaking. Doing so allows `react-compiler-runtime` to statically either re-export `React.__COMPILER_RUNTIME.c` or supply a polyfill, without the need for a dynamic import which is finicky to support due to returning a promise. In later PRs I will remove `react/compiler-runtime` and update the compiler to emit imports to `react-compiler-runtime` instead. DiffTrain build for [b78a7f2](b78a7f2)
github-actions bot
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Oct 7, 2024
In order to support using the compiler on versions of React prior to 19, we need the ability to statically import `c` (aka useMemoCache) or fallback to a polyfill supplied by `react-compiler-runtime` (note: this is a separate npm package, not to be confused with `react/compiler-runtime`, which is currently a part of react). To do this we first need to re-export `useMemoCache` under the top level React namespace again, which is additive and thus non-breaking. Doing so allows `react-compiler-runtime` to statically either re-export `React.__COMPILER_RUNTIME.c` or supply a polyfill, without the need for a dynamic import which is finicky to support due to returning a promise. In later PRs I will remove `react/compiler-runtime` and update the compiler to emit imports to `react-compiler-runtime` instead. DiffTrain build for [b78a7f2](b78a7f2)
This was referenced Oct 8, 2024
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In order to support using the compiler on versions of React prior to 19,
we need the ability to statically import
c(aka useMemoCache) orfallback to a polyfill supplied by
react-compiler-runtime(note: thisis a separate npm package, not to be confused with
react/compiler-runtime, which is currently a part of react).To do this we first need to re-export
useMemoCacheunder the top levelReact namespace again, which is additive and thus non-breaking. Doing so
allows
react-compiler-runtimeto statically either re-exportReact.__COMPILER_RUNTIME.cor supply a polyfill, without the need fora dynamic import which is finicky to support due to returning a promise.
In later PRs I will remove
react/compiler-runtimeand update thecompiler to emit imports to
react-compiler-runtimeinstead.