Incorrect type when using prefixItems

[zyoshoka]

Description

Using prefixItems generates incorrect type.

Name	Version
openapi-typescript	7.3.3
Node.js	20.17.0

Reproduction

The following schema

type: array
items:
  type: number
prefixItems:
  - number
  - number

generates incorrect type:

[number, number];

Expected result

This should generate open-tuple type according to JSON Schema 2020-12 draft¹:

[number, number, ...number[]];

and closed-tuple type should be generated²³ by

type: array
items: false
prefixItems:
  - number
  - number

or

type: array
unevaluatedItems: false
prefixItems:
  - number
  - number

Checklist

• My OpenAPI schema passes the Redocly validator (npx @redocly/cli@latest lint)
• I’m willing to open a PR (see CONTRIBUTING.md)

Footnotes

1. https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-01#name-prefixitems ↩

2. https://json-schema.org/draft/2020-12/release-notes#closed-tuple ↩

3. https://json-schema.org/understanding-json-schema/reference/array#unevaluateditems ↩