22 lines
569 B
TypeScript
22 lines
569 B
TypeScript
import * as React from "react";
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import { getCurrentOwner } from "./useIsStrictMode";
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// we know strict mode will render useMemo facory twice
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// keep a weak set to detect when the second render happens
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const memoSet = new WeakSet();
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export function useStrictMemo<TMemoized>(
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factory: () => any,
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deps: React.DependencyList | undefined
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): TMemoized | null {
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return React.useMemo(() => {
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const currentOwner = getCurrentOwner();
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if (!memoSet.has(currentOwner)) {
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memoSet.add(currentOwner);
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return null;
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}
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return factory();
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}, deps);
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}
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