option-t/esm/nullable/operators/unwrap_or_else.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 { isNotNull, expectNotNull } from '../core/nullable.js';
import { ERR_MSG_RECOVERER_MUST_NOT_RETURN_NO_VAL_FOR_NULLABLE } from '../internal/error_message.js';
/**
 *  Return _input_ as `T` if the passed _input_ is not `null`.
 *  Otherwise, return the result of _recoverer_.
 *
 *  * The result of _recoverer_ must not be `Nullable<*>`.
 *      * If you try to recover the value, use `orElse()`
 *  * If the result of _recoverer_ is `null`, throw `TypeError`.
 */
export function unwrapOrElseForNullable(input, recoverer) {
    if (isNotNull(input)) {
        return input;
    }
    const fallback = recoverer();
    const passed = expectNotNull(fallback, ERR_MSG_RECOVERER_MUST_NOT_RETURN_NO_VAL_FOR_NULLABLE);
    return passed;
}