import type { Predicate } from "./is.js";
/**
 * A type that has metadata.
 */
export type WithMetadata<T> = {
    __unknownutil_metadata: T;
};
/**
 * Get typeof the metadata
 */
export type GetMetadata<T> = T extends WithMetadata<infer M> ? M : never;
/**
 * Get metadata from the given value
 */
export declare function getMetadata<T>(v: unknown): T | undefined;
/**
 * Metadata of a predicate factory function.
 */
export type PredicateFactoryMetadata = {
    name: string;
    args: unknown[];
};
/**
 * Set metadata to a predicate factory function.
 */
export declare function setPredicateFactoryMetadata<P extends Predicate<unknown>, M extends PredicateFactoryMetadata>(pred: P, metadata: M): P & WithMetadata<M>;
/**
 * Get metadata from a predicate factory function.
 */
export declare function getPredicateFactoryMetadata<M extends PredicateFactoryMetadata>(v: WithMetadata<M>): M;
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