Not sure if I'm missing something, but wouldn't it be trivial to code that
constructor in JS?
```js
class Result {
constructor (type, value=true) {
this[type] = value;
}
}
function add(data) {
if (data !== Object(data)) {
return new Result('error', new Error('The data is not an object.'));
}
return new Result('success');
}
console.log(add({}).success); // true
console.log(add(12).error.message); // 'The data is not an object.'
```
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