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

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

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.

arktype•14mo ago•

10 replies

Nicolas

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

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

TypeError: Cannot convert undefined or null to object

Extract schema inside an array

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