export declare namespace util {
    type AssertEqual<T, Expected> = [T] extends [Expected] ? [Expected] extends [T] ? true : false : false;
    function assertNever(_x: never): never;
    type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
    type OmitKeys<T, K extends string> = Pick<T, Exclude<keyof T, K>>;
    type MakePartial<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
    const arrayToEnum: <T extends string, U extends [T, ...T[]]>(items: U) => { [k in U[number]]: k; };
    const getValidEnumValues: (obj: any) => any[];
    const objectValues: (obj: any) => any[];
    const objectKeys: ObjectConstructor["keys"];
    const find: <T>(arr: T[], checker: (arg: T) => any) => T | undefined;
    type identity<T> = T;
    type flatten<T extends object> = identity<{
        [k in keyof T]: T[k];
    }>;
    type noUndefined<T> = T extends undefined ? never : T;
    const isInteger: NumberConstructor["isInteger"];
    function joinValues<T extends any[]>(array: T, separator?: string): string;
}