/**
 * Type definition for the options parameter
 */
type FlatCopyOptions = {
    delimiter?: string;
    ommit?: string[];
    ommitArrays?: boolean;
    prefix?: string;
    ommitFn?: (key: string, value: any, newIndex: string) => boolean;
};
/**
 * Flattens an object into a single-level object with delimited keys.
 *
 * @param object - The object to flatten
 * @param options - Configuration options for flattening
 * @returns A single-level object with flattened keys
 * @throws Will throw an error if the input is not an object
 */
export declare function flatten(object: object, options?: FlatCopyOptions): Record<string, any>;
/**
 * Reverts a flattened object back to its nested structure, with support for arrays.
 *
 * @param object - The object to unflatten
 * @param delimiter - The delimiter used to flatten the object
 * @returns A nested object or array
 */
export declare function unflatten(object: Record<string, any>, delimiter?: string): object;
export {};