type DotPrefix<T extends string, U extends string> = '' extends T ? U : `${T}.${U}`;
type NestedKeys<T, Prefix extends string = ''> = {
    [K in keyof T & string]: T[K] extends Record<string, any> ? DotPrefix<Prefix, K> | NestedKeys<T[K], DotPrefix<Prefix, K>> : DotPrefix<Prefix, K>;
}[keyof T & string];
export type FlattenObjectType<T> = Record<NestedKeys<T>, any>;
/**
 * Flattens an object using dot notation for nested fields.
 * Arrays are treated as leaf nodes and are not traversed.
 * Includes both nested objects and their individual properties as separate keys.
 *
 * Example:
 * flattenObject({ a: { b: 1, c: { d: 2 } } })
 *   -> {
 *        'a': { b: 1, c: { d: 2 } },
 *        'a.b': 1,
 *        'a.c': { d: 2 },
 *        'a.c.d': 2
 *      }
 */
export declare function flattenObject<T extends object>(input: T): FlattenObjectType<T>;
export {};