Unexpected index signature collision

Description

Hello, I'm greenfielding a new project and am having typescript compiler issues caused by the index signature.

Frontend application is a freshly bootstrapped Vite app, backend generates the openapi spec using @fastify/swagger.

I understand why the index signature is there, however in our case the client and server are private and we use a code-first approach so incomplete docs should not be a problem for the consumer, therefore we have no need of it in this project.

While the issue needs a fix regardless, is there a way to disable adding the index signatures?

export type CreateTicketData = {
    /**
     * CreateTicketRequest
     */
    body: {
        statusUrl: string;
        vehicle: {
            licensePlate: string;
            licensePlateState: string;
        };
        /**
         * Epoch timestamp, in seconds
         */
        reportedAt: number;
        [key: string]: {
            [key: string]: unknown;
        };
        address: {
            street: string;
            street2?: string;
            city: string;
            state: string;
            zip: string;
        };
        location: {
            lat: number;
            lon: number;
        };
        price: {
            base: number;
            addons: Array<{
                name: string;
                amount: number;
            }>;
            escalationSurcharge: number;
            currency: string;
        };
    };
};

tsconfig.app.json

Reproducible example or configuration

# ./scripts/openapi.ts

import { config } from 'dotenv'
config()
import { createClient } from '@hey-api/openapi-ts'
import axios from 'axios'

async function main() {
  const { API_URL, API_KEY, DEBUG } = process.env
  if (!API_URL) {
    throw new Error('API_URL is required')
  }
  if (!API_KEY) {
    throw new Error('API_KEY is required')
  }
  const docsPath = `${API_URL}/api/__docs`
  const schema = await axios
    .get(docsPath, {
      headers: { 'x-api-key': API_KEY, Accept: 'application/json' },
    })
    .then((res) => res.data)

  if (DEBUG) {
    console.log(JSON.stringify(schema, null, 2))
  }
  createClient({
    client: '@hey-api/client-axios',
    input: schema,
    output: 'src/@sdk',
  })
}

main()

OpenAPI specification (optional)

schema.json

System information (optional)

No response

hey-api / openapi-ts