import { Cast, IfCouldBe, KeyNarrowingIteratee, Nil, ObjectIteratee, ValueNarrowingIteratee } from '../interfaces';
/**
 * Creates an object composed of the `object` properties `predicate` returns truthy for.
 *
 * Differences from lodash:
 * - does not treat sparse arrays as dense
 *
 * Contribution to minified bundle size, when it is the only function imported:
 * - Lodash: 14,874 bytes
 * - Micro-dash: 307 bytes
 */
export declare function pickBy<T, O>(object: T[] | Nil, predicate: ValueNarrowingIteratee<T[], O>): {
    [index: number]: Extract<T, O> | Extract<O, T>;
};
export declare function pickBy<T>(object: T[] | Nil, predicate: ObjectIteratee<T, boolean>): {
    [index: number]: T;
};
export declare function pickBy<I, T extends NonNullable<I>, O>(object: I, predicate: ValueNarrowingIteratee<T, O>): {
    [K in {
        [KK in keyof T]: IfCouldBe<T[KK], O, KK>;
    }[keyof T]]: Extract<T[K], O> | Extract<O, T[K]> | (Exclude<T[K], O> extends never ? never : undefined);
} | IfCouldBe<I, Nil, {}>;
export declare function pickBy<I, T extends NonNullable<I>, O>(object: I, predicate: KeyNarrowingIteratee<T, O>): {
    [K in {
        [KK in keyof T]: IfCouldBe<Cast<KK, string>, O, KK>;
    }[keyof T]]: T[K] | (Cast<K, string> extends O ? never : undefined);
} | IfCouldBe<I, Nil, {}>;
export declare function pickBy<T>(object: T, predicate: ObjectIteratee<T, boolean>): Partial<NonNullable<T>>;