option-t/esm/undefinable/operators/filter_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 { AsyncFilterFn } from '../../internal/function.js';
import { type Undefinable } from '../core/undefinable.js';
/**
 *  Returns `undefined` if the _input_ is `undefined`,
 *  otherwise calls _predicate_ with the _input_ `T` and returns:
 *
 *      * `T` if _predicate_ returns `true`.
 *      * `undefined` if _predicate_ returns `false`.
 */
export declare function filterAsyncForUndefinable<T>(input: Undefinable<T>, predicate: AsyncFilterFn<T>): Promise<Undefinable<T>>;