Files F100868667

useRefWithInitialValueFactory.js
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Created: Mon, Feb 3, 11:04

useRefWithInitialValueFactory.js
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	import { useRef } from 'react';
	var dft = Symbol('default value sigil');
	/**
	* Exactly the same as `useRef` except that the initial value is set via a
	* factroy function. Useful when the default is relatively costly to construct.
	*
	* ```ts
	* const ref = useRefWithInitialValueFactory<ExpensiveValue>(() => constructExpensiveValue())
	*
	* ```
	*
	* @param initialValueFactory A factory function returning the ref's default value
	* @category refs
	*/

	export default function useRefWithInitialValueFactory(initialValueFactory) {
	var ref = useRef(dft);

	if (ref.current === dft) {
	ref.current = initialValueFactory();
	}

	return ref;
	}

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