A
arktype•4w ago
bigboyjo

Ensure a property is greater than a different property?

Is there a way to set a constraint for a number property so that it must be larger than a different property, like so? 
type({ min: 'number > 1', max: 'number > min' })
type({ min: 'number > 1', max: 'number > min' })
3 Replies
Apteryx
Apteryx•4w ago
https://arktype.io/docs/expressions#narrow 
const Thing = type({ min: 'number > 1', max: 'number' }).narrow((data, ctx) => {
  if (data.max > data.min) return true;
  return ctx.reject({
    expected: `more than ${data.min}`,
    actual: `${data.max}`,
    path: ['max'],
  });
});

const thing = Thing({ min: 2, max: 1 });
console.log(thing instanceof type.errors); // true
const Thing = type({ min: 'number > 1', max: 'number' }).narrow((data, ctx) => {
  if (data.max > data.min) return true;
  return ctx.reject({
    expected: `more than ${data.min}`,
    actual: `${data.max}`,
    path: ['max'],
  });
});

const thing = Thing({ min: 2, max: 1 });
console.log(thing instanceof type.errors); // true
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bigboyjo
bigboyjoOP•4w ago
I see. There's no way to do it at the type level via strings?
ssalbdivad
ssalbdivad•4w ago
there is an open issue for this that I'd accept PRs on but may be a bit tricky: https://github.com/arktypeio/arktype/issues/485
GitHub
Allow relative references for constraints (e.g. "string==./repeatPa...

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