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Nicolas

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•Created by Nicolas on 1/19/2025 in #questions

Extract schema inside an array

Hello there, I'm new to ArkType, and I'm hitting an issue that I cannot seem to be able to solve... I'm trying to extract the runtime schema from within an array. Here is a simple example:

const simple = type({
  id: 'number',
  array: type({
    name: 'string',
    age: 'number',
  }).array(),
});

const array = simple.get('array');
const arrayContent = array.get(0);
const res = arrayContent({ name: 'Rico', age: 25 });

const simple = type({
  id: 'number',
  array: type({
    name: 'string',
    age: 'number',
  }).array(),
});

const array = simple.get('array');
const arrayContent = array.get(0);
const res = arrayContent({ name: 'Rico', age: 25 });

The type of res is correctly inferred to

const res: {
    name: string;
    age: number;
} | ArkErrors

const res: {
    name: string;
    age: number;
} | ArkErrors

However, the last line is always crashing with TypeError: Cannot convert undefined or null to object it seems the runtime schema is not correctly extracted. I know this was referred as an "anti-pattern" in the docs but here I'm trying to build a tool that can generate an openapi spec out of an ArkType definition so I cannot split my type. Any help would be appreciated.

11 replies

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