option-t
Version:
A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.
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TypeScript
import type { TransformFn } from '../../internal/function.js';
import type { Option } from './option.js';
export type OptionTryTransformFn<in T, out U> = TransformFn<T, Option<U>>;
/**
* Returns `None` if the _input_ is `None`,
* otherwise calls _transformer_ with the value and returns the result.
*
* XXX:
* Some languages call this operation flatmap.
* But we don't provide `flatMap()` as alias of this function
* to sort with other APIs.
*/
export declare function andThenForOption<T, U>(input: Option<T>, transformer: OptionTryTransformFn<T, U>): Option<U>;