option-t/esm/undefinable/undefinable.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_NO_VAL_FOR_UNDEFINABLE } from './internal/error_message.js';
export function isNotUndefined(input) {
    return input !== undefined;
}
export function isUndefined(input) {
    return input === undefined;
}
/**
 *  Return _input_ as `T` if the passed _input_ is not `undefined`.
 *  Otherwise, throw `TypeError` with the passed `msg`.
 */
export function expectNotUndefined(input, msg) {
    if (isNotUndefined(input)) {
        return input;
    }
    throw new TypeError(msg);
}
/**
 *  Return _input_ as `T` if the passed _input_ is not `undefined`.
 *  Otherwise, throw `TypeError`.
 */
export function unwrapUndefinable(input) {
    return expectNotUndefined(input, ERR_MSG_UNWRAP_NO_VAL_FOR_UNDEFINABLE);
}