bsky-app/lib/react-compiler-runtime/index.js

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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) {
// eslint-disable-next-line react-hooks/rules-of-hooks
return React.useState(() => {
const $ = new Array(size)
for (let ii = 0; ii < size; ii++) {
$[ii] = $empty
}
// @ts-ignore
$[$empty] = true
return $
})[0]
}