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React Compiler compatibility module for codebases unable to use React 19
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module.exports = function(api) { | |
return { | |
plugins: [ | |
[ | |
'babel-plugin-react-compiler', { | |
runtimeModule: 'react-compiler-runtime' | |
} | |
] | |
] | |
} | |
} |
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{ | |
"dependencies": { | |
"react-compiler-runtime": "file:./lib/react-compiler-runtime" | |
}, | |
"devDependencies": { | |
"babel-plugin-react-compiler": "latest" | |
} | |
} |
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// lib/react-compiler-runtime/index.js | |
const React = require('react'); | |
const $empty = Symbol.for("react.memo_cache_sentinel"); | |
/** | |
* DANGER: this hook is NEVER meant to be called directly! | |
* | |
* Note that this is a temporary userspace implementation of this function | |
* from React 19. It is not as efficient and may invalidate more frequently | |
* than the official API. Please upgrade to React 19 as soon as you can. | |
**/ | |
export function c(size: number) { | |
return React.useState(() => { | |
const $ = new Array(size); | |
for (let ii = 0; ii < size; ii++) { | |
$[ii] = $empty; | |
} | |
// @ts-ignore | |
$[$empty] = true; | |
return $; | |
})[0]; | |
} |
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// lib/react-compiler-runtime/package.json | |
{ | |
"name": "react-compiler-runtime", | |
"version": "0.0.1", | |
"license": "MIT", | |
"main": "index.js", | |
"dependencies": { | |
"react": "^18.2.0" | |
} | |
} |
#file-react-compiler-runtime-index-js-L13
What's the difference between using React.useState and returning an normal Array ?
I tried Array to work as well too
+1ing @jsonz1993
Middle ground may even be using useRef
to keep it safely contained and consistent.
// lib/react-compiler-runtime/index.js
const { useRef } = require('react');
const $empty = Symbol.for("react.memo_cache_sentinel");
/**
* DANGER: this hook is NEVER meant to be called directly!
*
* Note that this is a temporary userspace implementation of this function
* from React 19. It is not as efficient and may invalidate more frequently
* than the official API. Please upgrade to React 19 as soon as you can.
**/
export function c(size: number): any[] {
const memoArrayRef = useRef<any[] | undefined>(undefined)
if (!memoArrayRef.value) {
memoArrayRef.value = []
for (let i = 0; i < size; i += 1) {
memoArrayRef.value.push($empty)
}
// @ts-ignore
memoArrayRef.value[$empty] = true;
}
return memoArrayRef.value
}
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@iahu
downgrading vite plugin worked! cheers