option-t/esm/maybe/map_async.d.ts

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

import type { AsyncTransformFn } from '../internal/function.js';
import { type Maybe, type NotNullOrUndefined } from './maybe.js';
/**
 *  Return the result of _transformer_ with using _input_ as an argument for it if _input_ is not `null` and `undefined`.
 *  Otherwise, return `null` or `undefined` inputted as _input_.
 *
 *  * `U` must not be `Maybe<*>`.
 *      * If you'd like return `Maybe<*>` as `U`, use `andThen()`.
 *      * If the result of _transformer_ is `null` or `undefined`, this throw an `Error`.
 */
export declare function mapAsyncForMaybe<T, U>(input: Maybe<T>, transformer: AsyncTransformFn<T, NotNullOrUndefined<U>>): Promise<Maybe<U>>;