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option-t

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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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import { createOk, createErr } from '../plain_result/result.js'; import { isNullOrUndefined } from './maybe.js'; /** * Return `Err<void>` if _input_ is `null` or `undefined`. * Otherwise, return `Ok<T>` directly. */ export function toResultOkFromMaybe(input) { if (isNullOrUndefined(input)) { return createErr(undefined); } const result = createOk(input); return result; } /** * Return `Ok<void>` if _input_ is `null` or `undefined`. * Otherwise, return `Err<E>` directly. */ export function toResultErrFromMaybe(input) { if (isNullOrUndefined(input)) { return createOk(undefined); } const result = createErr(input); return result; }