/**
 * Type guard for checking if a value or object is non null.
 *
 * @export
 */
export declare function isNonNull<T>(value: T | undefined | null): value is NonNullable<T>;
/**
 * Type guard for checking if a value or object is defined.
 *
 * @export
 */
export declare function isDefined<T>(value: T | undefined | null): value is NonNullable<T>;
/**
 * Checks if a value or object is non null or undefined, throws an error otherwise.
 *
 * @export
 */
export declare function requireNonNull<T>(value: T | null | undefined, message: string): T;