import type { NullOrUndefined } from "../types";
/**
 * Type guard that checks if a value is null or undefined.
 *
 * @param value - The value to check
 * @returns True if the value is null or undefined, false otherwise
 */
export declare function isNil(value: unknown): value is NullOrUndefined;
/**
 * @deprecated Use {@link isNil} instead.
 */
export declare function isNullOrUndefined<T>(value: T | NullOrUndefined): value is NullOrUndefined;