export * from 'fast-check';
import * as fc from 'fast-check';
import { symbol as Symbol } from '@traversable/registry';
export interface Arbitrary<T = unknown> extends fc.Arbitrary<T> {
    readonly [Symbol.optional]?: true;
}
export type { typeOf as typeof };
type typeOf<S> = S extends fc.Arbitrary<infer T> ? T : never;
export type UniqueArrayDefaults<T = unknown, U = unknown> = fc.UniqueArrayConstraintsRecommended<T, U>;
export declare function identifier(constraints?: fc.StringMatchingConstraints): fc.Arbitrary<string>;
export declare const entries: <T, U>(model: fc.Arbitrary<T>, constraints?: UniqueArrayDefaults<T, U>) => fc.Arbitrary<[k: string, v: T][]>;
/**
 * ### {@link optional `fc.optional`}
 */
export declare function optional<T>(model: fc.Arbitrary<T>): Arbitrary<T>;
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