export declare function assertsDefined<T>(value: T | undefined, message?: string): asserts value is T;
export declare function assertsNotNull<T>(value: T | null, message?: string): asserts value is T;
export declare function assertsDefinedAndNotNull<T>(value: T | undefined | null, message?: string): asserts value is T;
export declare function defined<T>(value: T | undefined): T;
export declare function notNull<T>(value: T | null): T;
export declare function definedAndNotNull<T>(value: T | undefined | null): T;