import type { AsyncTransformFn, AsyncRecoveryFn } from '../internal/function.js';
import { type Nullable, type NotNull } from './nullable.js';
/**
 *  Return the result of _transformer_ with using _input_ as an argument for it if _input_ is not `null`.
 *  Otherwise, return the result of _recoverer_.
 *
 *  Basically, this operation is a combination `mapAsync()` and `unwrapOrElseAsync()`.
 *
 *  * `U` must not be `Nullable<*>`.
 *      * If the result of _transformer_ is `null`, this throw an `Error`.
 *      * If the result of _recoverer_ is null`, this throw an `Error`.
 *  * If you'd like to accept `Nullable<*>` as `U`, use a combination `andThenAsync()` and `orElseAsync()`.
 */
export declare function mapOrElseAsyncForNullable<T, U>(input: Nullable<T>, recoverer: AsyncRecoveryFn<NotNull<U>>, transformer: AsyncTransformFn<T, NotNull<U>>): Promise<NotNull<U>>;