/**
 * Collection of type guards. Use this module by importing from
 * `@sirpepe/shed/guard`.
 */
/**
 * Returns true when the argument is neither null nor undefined. Works as a type
 * guard in TypeScript. The inverse of `isNot()`.
 *
 * Example:
 *
 * ```typescript
 * is(42); // true
 * is(0); // true
 * is(null); // false
 * is(undefined); // false
 * ```
 */
export declare function is<T>(x: T | undefined | null): x is T;
/**
 * Returns true when the argument is null or undefined. Works as a type guard in
 * TypeScript. The inverse of `is()`.
 *
 * Example:
 *
 * ```typescript
 * isNot(42); // false
 * isNot(0); // false
 * isNot(null); // true
 * isNot(undefined); // true
 * ```
 */
export declare function isNot<T>(x: T | undefined | null): x is null | undefined;