import got, { Method, Response } from 'got';

interface ApiResponse<T> {
  code: number;
  message: string;
  result: T;
  success: boolean;
  timestamp: number;
}

async function fetchData<R>(url: string, method: Method, data?: unknown): Promise<R> {
  try {
    const response: Response<ApiResponse<R>> = await got<ApiResponse<R>>({
      url,
      method,
      headers: {
        'Content-Type': 'application/json'
      },
      json: data,
      responseType: 'json'
    });

    // this response.body is 'any'
    return response.body.result;
   
  } catch (e: any) {
    throw new Error(`Request failed: ${e.message}`);
  }
}

(async () => {
  const result = await fetchData<{ accessToken: string }>('https://example.com/api/token', 'POST', { key: 'value' });
  console.log(result.accessToken); // TypeScript should infer the correct type here
})();