import { type DecisionFunction } from './../value/decision';
/**
 * DecisionFunction that checks whether or not the input is in the set, or the input's value is in the set.
 */
export type IsInSetDecisionFunction<T, V> = DecisionFunction<T> & {
    readonly _readValue: (input: T) => V;
    readonly _set: Set<V>;
};
/**
 * Creates an {@link IsInSetDecisionFunction} that checks whether a value (or a derived value) is in the given set.
 *
 * @param set - The set to check membership against.
 * @param readValue - Optional function to extract the lookup value from the input. Defaults to identity.
 * @returns A decision function that returns true for values found in the set.
 */
export declare function isInSetDecisionFunction<T>(set: Set<T>): IsInSetDecisionFunction<T, T>;
export declare function isInSetDecisionFunction<T, V>(set: Set<V>, readValue: (value: T) => V): IsInSetDecisionFunction<T, V>;