etc

gistfile1.txt

/**
 * Creates a fetch instance with a base URL, customizable headers, and a default method depending on the environment.
 * @param {string} endpoint - The endpoint to request.
 * @param {Object} options - The options for the fetch request, including method and headers.
 * @returns {Promise<Response>} The fetch promise.
 */
function customFetch(endpoint, options = {}) {
  // Define the base URL depending on the environment
  const baseURL = {
    development: 'http://localhost:3000',
    production: 'https://api.example.com'
  }[process.env.NODE_ENV || 'development'];

  // Default settings for fetch options
  const defaultOptions = {
    method: 'GET', // Default method
    headers: {
      'Content-Type': 'application/json',
      'Accept': 'application/json',
    }
  };

  // Merge default options with user-provided options
  // This includes merging headers
  const fetchOptions = {
    ...defaultOptions,
    ...options,
    headers: { ...defaultOptions.headers, ...(options.headers || {}) }
  };

  // Create the full URL
  const url = new URL(endpoint, baseURL).href;

  return fetch(url, fetchOptions);
}

// Usage example
customFetch('/users') // No method specified, defaults to 'GET'
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));