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