$ref objects in query params aren't spread onto type

[aeharding]

openapi-typescript version

7.8.0

Node.js version

22.14.0

OS + version

macOS 15.5

Description

I am having troubles find out how to use a schema $ref object within query parameters.

They below example is simplified from https://freamon.github.io/piefed-api/ where the problem can be reproduced.

I would expect the $ref object to be spread onto the type. For example,

query?:  components["schemas"]["Foo"] & components["schemas"]["Bar"] & components["schemas"]["Baz"];

Instead I get something like:

query?: {
  Foo?: components["schemas"]["Foo"];
  Bar?: components["schemas"]["Bar"];
  Baz?: components["schemas"]["Baz"];
};

Reproduction

Input

openapi: 3.1.1

info:
  version: 1.0.0
  title: Test

servers:
  - url: https://piefed.social/api/alpha

security:
  - bearerAuth: []

paths:
  /post/list:
    get:
      summary: Get posts
      parameters:
        - name: GetPosts
          in: query
          explode: true
          schema:
            $ref: "#/components/schemas/GetPosts"
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
  schemas:
    GetPosts:
      properties:
        page:
          title: GetPosts.page
          type: integer
        limit:
          title: GetPosts.limit
          type: integer
      additionalProperties: false
      title: GetPosts
      type: object

Output

/**
 * This file was auto-generated by openapi-typescript.
 * Do not make direct changes to the file.
 */

export interface paths {
    "/post/list": {
        parameters: {
            query?: never;
            header?: never;
            path?: never;
            cookie?: never;
        };
        /** Get posts */
        get: {
            parameters: {
                query?: {
                    GetPosts?: components["schemas"]["GetPosts"];
                };
                header?: never;
                path?: never;
                cookie?: never;
            };
            requestBody?: never;
            responses: never;
        };
        put?: never;
        post?: never;
        delete?: never;
        options?: never;
        head?: never;
        patch?: never;
        trace?: never;
    };
}
export type webhooks = Record<string, never>;
export interface components {
    schemas: {
        /** GetPosts */
        GetPosts: {
            /** GetPosts.page */
            page?: number;
            /** GetPosts.limit */
            limit?: number;
        };
    };
    responses: never;
    parameters: never;
    requestBodies: never;
    headers: never;
    pathItems: never;
}
export type $defs = Record<string, never>;
export type operations = Record<string, never>;



### Expected result

Actual:

```ts
query?: {
  GetPosts?: components["schemas"]["GetPosts"];
};

Expected:

query?: components["schemas"]["GetPosts"];

Note that when loading in Swagger playground, the test request properly executes.

Required

• My OpenAPI schema is valid and passes the Redocly validator (npx @redocly/cli@latest lint)

Extra

• I’m willing to open a PR (see CONTRIBUTING.md)