export declare function shouldThrow(promise: Promise<any>): Promise<void>;
export declare function shouldNotFail<T>(promise: Promise<T>): Promise<void>;
export declare const shouldFail: (promise: Promise<any>, message?: string | null) => Promise<void>;
export declare const assertThrows: (promise: Promise<any>, message?: string | null) => Promise<void>;
export declare const assertThrowsSync: (f: () => any) => void;