export interface FlattenOptions {
  delimiter?: string;
  maxDepth?: number;
  safe?: boolean;
  transformKey?: (key: string) => string;
}

export function flatten<T, R>(target: T, options?: FlattenOptions): R;

export interface UnflattenOptions {
  delimiter?: string;
  object?: boolean;
  overwrite?: boolean;
  transformKey?: (key: string) => string;
}

export function unflatten<T, R>(target: T, options?: UnflattenOptions): R;