Omitted request body path param leaves an empty request body

[levi]

#10 Removed path params from request bodies. However, if the request body only has a single parameter that is the path parameter, the generated spec will still define a required empty request body. For example:

export const router = createTRPCRouter({
  favorite: procedure
    .meta({ openapi: { method: 'POST', path: '/posts/{id}/favorite' } })
    .input(z.object({ id: z.string() }))
    .output(z.object({ id: z.string() }))
    .mutation(async ({ ctx, input }) => {
      // ...
    })
})

Generates:

{
  "post": {
    "operationId": "mutation.post.favorite",
    "requestBody": {
      "required": true,
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {},
            "additionalProperties": false
          }
        }
      }
    },
    "parameters": [
      {
        "name": "id",
        "in": "path",
        "required": true,
        "schema": { "type": "string" }
      }
    ],
    "responses": {
      //...
    }
  }
}

When really it should have no body at all, since there is technically no request body required. This causes an issue with my code gen tooling, since an empty request body creates an Any type and it doesn't know how to decode it.