option-t/esm/deprecated/plain_option/option.js

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

import { ERR_MSG_UNWRAP_SOME_BUT_INPUT_IS_NONE } from './internal/error_message.js';
export function isSome(input) {
    return input.ok;
}
export function createSome(val) {
    const r = {
        ok: true,
        val,
    };
    return r;
}
export function isNone(input) {
    return !input.ok;
}
export function createNone() {
    const r = {
        ok: false,
        // XXX:
        //  We need to fill with `null` to improve the compatibility with Next.js
        //  see https://github.com/option-t/option-t/pull/1256
        val: null,
    };
    return r;
}
/**
 *  Return the inner `T` of a `Some(T)`.
 *
 *  @throws {TypeError}
 *      Throws if the self is a `None`.
 */
export function unwrapSome(input) {
    return expectSome(input, ERR_MSG_UNWRAP_SOME_BUT_INPUT_IS_NONE);
}
/**
 *  Return _input_ as `T` if the passed _input_ is `Some(T)`.
 *  Otherwise, throw `TypeError` with the passed `msg`.
 *
 *  @throws {TypeError}
 *      Throws if the self is a `None`.
 */
export function expectSome(input, msg) {
    if (!input.ok) {
        throw new TypeError(msg);
    }
    return input.val;
}