export type FlattenedObject<T> = {
    [K in keyof T]?: T[K] extends object ? FlattenedObject<T[K]> : T[K];
} & {
    [key: string]: any;
};
/**
 * Flattens a nested object structure.
 * @param {T} obj - The object to flatten.
 * @param {string} [prefix=''] - The prefix to use for flattened keys.
 * @returns A flattened version of the input object.
 * @example
 * const nestedObj = { a: 1, b: { c: 2, d: { e: 3 } } };
 * const flattenedObj = flatten(nestedObj);
 * // { 'a': 1, 'b.c': 2, 'b.d.e': 3 }
 */
export declare function flatten<T extends Record<string, any>>(obj: T, prefix?: string): FlattenedObject<T>;