import type { LogParams } from '../../types/internal';
/**
 * Asserts that the value is defined (is not `undefined`).
 */
export declare function assertValueIsDefined<Type>(value: Type, check: string, payload?: LogParams): asserts value is Exclude<Type, undefined>;
/**
 * Asserts that the value is `undefined` (is not defined).
 */
export declare function assertValueIsUndefined<Type>(value: Type, check: string, payload?: LogParams): asserts value is Type & undefined;