Missing '"nullable": true' in resulting jsonschema

I am using https://www.graphql-code-generator.com/ to generate types from graphql schemas. I am generating json schemas from those types, but fields that are nullable does not come out as nullable.

test.ts:

export type Maybe<T> = T | null;

export type Scalars = {
    String: string;
};

export type CreateTransactionInput = {
    readonly brokerTradeId?: Maybe<Scalars["String"]>;
};

> npx typescript-json-schema --noExtraProps test.ts CreateTransactionInput
{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "additionalProperties": false,
    "properties": {
        "brokerTradeId": {
            "type": "string"
        }
    },
    "type": "object"
}

In my mind, the result is missing below on property brokerTradeId

"nullable": true,

What am I doing wrong?

[frontendphil]

Came here for exactly that.

Some more of my context. I’ve defined a type:

type A = string | null

I know that when I set --strictNullCheck I get a type: ['string', 'null'] in the resulting schema. However, the typescript support of ajv complains that this is not valid JSON schema syntax and that the property should rather have nullable: true set.

So, I have no idea who is right on this one 😄

[CloudPower97]

I have the same exact problem as described by @frontendphil Did you manage to resolve this issue somehow?