option-t/esm/nullable/nullable.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_NULLABLE } from './internal/error_message.js';
export function isNotNull(input) {
    return input !== null;
}
export function isNull(input) {
    return input === null;
}
/**
 *  Return _input_ as `T` if the passed _input_ is not `null`.
 *  Otherwise, throw `TypeError` with the passed `msg`.
 */
export function expectNotNull(input, msg) {
    if (isNotNull(input)) {
        return input;
    }
    throw new TypeError(msg);
}
/**
 *  Return _input_ as `T` if the passed _input_ is not `null`.
 *  Otherwise, throw `TypeError`.
 */
export function unwrapNullable(input) {
    return expectNotNull(input, ERR_MSG_UNWRAP_NO_VAL_FOR_NULLABLE);
}