nateiler Posts - Answer Overflow

nateiler

•Created by nateiler on 4/3/2025 in #questions

Partial parse

Once in a while we encounter some data that's been stored away and the schema has changed over time. I'd like to parse it but also be forgiving enough to return the partially parsed schema. Something like this:

import { type } from 'arktype';

const test = type({
  foo: type("string.numeric.parse"),
  bar: type("number"),
  baz: type("string.date.iso.parse")
});

// bar is expected to fail
const out = test({ foo: '1', bar: "2", baz: "2011-10-05T14:48:00.000Z" });

if (out instanceof type.errors) {
  // log errors to fix after the fact

  // ctx is protected, but ctx.root is useful?
  const partiallyParsed = out.ctx.root;

  console.log("Partially parsed data", partiallyParsed);
}

import { type } from 'arktype';

const test = type({
  foo: type("string.numeric.parse"),
  bar: type("number"),
  baz: type("string.date.iso.parse")
});

// bar is expected to fail
const out = test({ foo: '1', bar: "2", baz: "2011-10-05T14:48:00.000Z" });

if (out instanceof type.errors) {
  // log errors to fix after the fact

  // ctx is protected, but ctx.root is useful?
  const partiallyParsed = out.ctx.root;

  console.log("Partially parsed data", partiallyParsed);
}

9 replies

Aarktype

•Created by nateiler on 3/24/2025 in #questions

Reference another schema type as default?

Hello, I'm relatively new to Arktype. I've managed to figure out most of our Zod migration, however I have a couple scenarios where I would like to reference other types as default values -or- compose a 'computed' property. In this scenario I'd like to use the provided 'createdAt' value as the default 'modifiedAt' value:

import { type } from 'arktype';

const UserSchema = type({
  firstName: type("string"),
  lastName: type("string"),
  createdAt: type("string.date.iso.parse"),
  modifiedAt: type("string.date.iso.parse").default(// -> default to createdAt)
})

import { type } from 'arktype';

const UserSchema = type({
  firstName: type("string"),
  lastName: type("string"),
  createdAt: type("string.date.iso.parse"),
  modifiedAt: type("string.date.iso.parse").default(// -> default to createdAt)
})

And in this scenario, I'm doing some parsing prior to return an API payload. I would like to compose a type based off two other types:

const UserSchema = type({
  firstName: type("string"),
  lastName: type("string"),
  name: type("string").default(// -> reference firstName and lastName),
})

const UserSchema = type({
  firstName: type("string"),
  lastName: type("string"),
  name: type("string").default(// -> reference firstName and lastName),
})

Note : these are simplified examples Both seem somewhat related, but I haven't figured out how or if it's possible to accomplish these.

3 replies

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