gistfile1.txt

% cat test/data/union.vl
load console

union ParseResult with
    Ok(value: number)
    Error(reason: string)
end

do
    console.log(Ok(42).value)
    console.log(Error("fail").reason)
end
% ./build vlinder && esgenerate -c <(echo '{ "comment": true }') <(./vlinder.native test/data/union.vl)
Finished, 39 targets (39 cached) in 00:00:01.
/* @flow */
'use strict';
var __vlinder = require('vlinder/rt');
var __global = __vlinder.global;
var console = __global.console;
module.exports.ParseResult = class {
};
class Ok$class extends module.exports.ParseResult {
    constructor(value /* : number */) {
        super();
        this.value = value;
    }
}
module.exports.Ok = function (value /* : number */)
    /* : module.exports.ParseResult */
    {
        return new Ok$class(value);
    };
class Error$class extends module.exports.ParseResult {
    constructor(reason /* : string */) {
        super();
        this.reason = reason;
    }
}
module.exports.Error = function (reason /* : string */)
    /* : module.exports.ParseResult */
    {
        return new Error$class(reason);
    };
(function () {
    console.log(module.exports.Ok(42).value);
    console.log(module.exports.Error('fail').reason);
}());