import { ValidationException } from './ValidationException';
/**
 * Is the value a promise?
 * See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
 *
 * @example
 * ```ts
 * isPromise(Promise.resolve(a)) // true
 * isPromise(() => 'a') // false
 * ```
 *
 * @param value the value to check
 * @returns a boolean indicating whether the value is the expected type
 */
export declare const isPromise: <T>(value: unknown | Promise<T>) => value is Promise<T>;
/**
 * Validate that the value is a promise.
 * See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
 *
 * @example
 * ```ts
 * validatePromise(Promise.resolve(a)) // null
 * validatePromise(() => 'a') // ValidationException
 * ```
 *
 * @param value the value to check
 * @returns `null` if the value is the expected type or a `ValidationException`
 * if not
 */
export declare const validatePromise: (value: unknown) => ValidationException | null;
/**
 * Assert that the value is a promise.
 * See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
 *
 * @example
 * ```ts
 * assertPromise(Promise.resolve(a)) // void
 * assertPromise(() => 'a') // throws AssertionException
 * ```
 *
 * @param value the value to check
 * @throws an `AssertionException` if the value is not the expected type
 */
export declare const assertPromise: <T>(value: unknown | Promise<T>) => asserts value is Promise<T>;