import type { FieldKey, FieldOptions } from '../type/index.js';
export declare function clone<T>(value: T): T;
export declare function hasKeys(obj: unknown): boolean;
export declare function getKeys<T extends object>(obj: T): (keyof T & string)[];
export declare function getFieldKeys<E>(fields: {
    [K in FieldKey<E>]?: FieldOptions;
}): FieldKey<E>[];
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