bc518174
 王天杨
提交两个项目文件
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import { Dispatch, SetStateAction, useState } from 'react';
export type DispatchStateAction<T> = Dispatch<SetStateAction<T>>;
/**
* Helper hook for using controlled/uncontrolled values from a component props.
*
* When the value is not controlled, pass `undefined` as `controlledValue` and
* use the returned setter to update it.
*
* When the value is controlled, pass the controlled value as second
* argument, which will be always returned as `value`.
*/
export function useControlledValue<T>(
defaultValue: T,
controlledValue: T | undefined
): [T, DispatchStateAction<T>] {
const [uncontrolledValue, setValue] = useState(defaultValue);
const value =
controlledValue === undefined ? uncontrolledValue : controlledValue;
return [value, setValue] as [T, DispatchStateAction<T>];
}
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