result-js/src/result.expectErr.c.js

Rusty Monad Results for JS

'use strict';

const sym = require('../interface/result-sym.h');


require('../interface/result.h').prototype.expectErr = function ($msg) {
    if (!this[sym.isOk]) {
        return this[sym.value];
    }

    const msg = typeof $msg === 'string' ? $msg : 'ERROR: $msg is not a string. Also -> ';
    throw new Error(`${msg}: ${this[sym.value].toString()}`);
};