type Obj = { [key: string]: any }; declare module 'nested-property' { interface IHasNestedPropertyOptions { own?: boolean; } interface IIsInNestedPropertyOptions { validPath?: boolean; } export function set(object: T, property: string, value: any): T; export function get(object: Obj, property: string): any; export function has(object: Obj, property: string, options?: IHasNestedPropertyOptions): boolean; export function hasOwn(object: Obj, property: string, options?: IHasNestedPropertyOptions): boolean; export function isIn(object: Obj, property: string, objectInPath: Obj, options?: IIsInNestedPropertyOptions): boolean; }