/**
 * Recursively flattens an object of arbitrary depth. Nested keys are concatenated with a dot.
 * e.g. { a: { b: { c: 1, d: 2 }, e: 3 }, f: 4 } => { 'a.b.c': 1, 'a.b.d': 2, 'a.e': 3, f: 4 }
 */
export declare function flattenObject(object: Record<string, any>): Record<string, any>;