import type { Context } from 'react';
type EqualityFn = (a: unknown, b: unknown) => boolean;
/**
 * This hook returns a part of the context value by selector.
 * It will trigger a re-render only if the selected value has changed.
 *
 * By default, a shallow equals of the selected context value is used to
 * determine if a re-render is needed.
 *
 * @param context Context.
 * @param selector Returns a fragment of the context
 * that the consumer is interested in.
 * @param equalityFn Used to compare the
 * selected context value. If the context fragment has not changed, a re-render
 * will not be triggered. This is {shallowEqual} by default.
 * @return The selected context value fragment.
 */
declare function useContextSelector<T, S>(context: Context<T>, selector: (value: T) => S, equalityFn?: EqualityFn): S;
export default useContextSelector;
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