/**
 * Returns a `function` that receives as a second argument whats
 * returned from it.
 *
 * @template T
 * @param {(next: T, previous: T) => T} fn
 * @url https://pota.quack.uy/use/selector/usePrevious
 */
export function usePrevious<T>(fn: (next: T, previous: T) => T): (next?: T) => T;
/**
 * Returns a `isSelected` function that will return `true` when the
 * argument for it matches the original signal `value`.
 *
 * @param {SignalAccessor<unknown>} value - Signal with the current
 *   value
 * @url https://pota.quack.uy/use/selector/useSelector
 */
export function useSelector(value: SignalAccessor<unknown>): (item: T) => SignalAccessor<T>;
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