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Object type ignored when nested properties use oneOf and raw #233

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@ghost

Description

Prerequisites

  • I have written a descriptive issue title
  • I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.23.2

Plugin version

4.2.1

Node.js version

20.x

Operating system

macOS

Operating system version (i.e. 20.04, 11.3, 10)

13.4

Description

When I'm creating a schema like this:

const schema = S.object().prop(
  "content",
  S.object()
    .raw({ type: "object", discriminator: { propertyName: "type" } })
    .oneOf([schema1, schema2]),
);

The type: object is omitted in the resulting JSON Schema both event if I use S.object() and raw type object. This can throw errors for example when using Ajv in strict mode. I do not know if the problem it's caused by the oneOf or the raw clause.

Steps to Reproduce

You can see a full reproduction example here: https://codesandbox.io/p/sandbox/infallible-cloud-4kw5xm. Run npm start.

Expected Behavior

The resulting JSON schema should not be this:

{
  '$schema': 'http://json-schema.org/draft-07/schema#',
  type: 'object',
  properties: { content: { discriminator: [Object], oneOf: [Array] } }
}

but this:

{
  '$schema': 'http://json-schema.org/draft-07/schema#',
  type: 'object',
  properties: { content: { type: 'object', discriminator: [Object], oneOf: [Array] } }
}

It seems that this issue is not present on schemas root level oneOf/raw.

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