const {request} = require('gaxios');
const res = await request({
  url: 'https://www.googleapis.com/discovery/v1/apis/',
});

const gaxios = require('gaxios');
gaxios.instance.defaults = {
  baseURL: 'https://example.com'
  headers: {
    Authorization: 'SOME_TOKEN'
  }
}
gaxios.request({url: '/data'}).then(...);

{
  // The url to which the request should be sent.  Required.
  url: string,

  // The HTTP method to use for the request.  Defaults to `GET`.
  method: 'GET',

  // The base Url to use for the request. Prepended to the `url` property above.
  baseURL: 'https://example.com';

  // The HTTP methods to be sent with the request.
  headers: { 'some': 'header' },

  // The data to send in the body of the request. Data objects will be
  // serialized as JSON.
  //
  // Note: if you would like to provide a Content-Type header other than
  // application/json you you must provide a string or readable stream, rather
  // than an object:
  // data: JSON.stringify({some: 'data'})
  // data: fs.readFile('./some-data.jpeg')
  data: {
    some: 'data'
  },

  // The max size of the http response content in bytes allowed.
  // Defaults to `0`, which is the same as unset.
  maxContentLength: 2000,

  // The max number of HTTP redirects to follow.
  // Defaults to 100.
  maxRedirects: 100,

  // The querystring parameters that will be encoded using `qs` and
  // appended to the url
  params: {
    querystring: 'parameters'
  },

  // By default, we use the `querystring` package in node core to serialize
  // querystring parameters.  You can override that and provide your
  // own implementation.
  paramsSerializer: (params) => {
    return qs.stringify(params);
  },

  // The timeout for the HTTP request in milliseconds. Defaults to 0.
  timeout: 1000,

  // Optional method to override making the actual HTTP request. Useful
  // for writing tests and instrumentation
  adapter?: async (options, defaultAdapter) => {
    const res = await defaultAdapter(options);
    res.data = {
      ...res.data,
      extraProperty: 'your extra property',
    };
    return res;
  };

  // The expected return type of the request.  Options are:
  // json | stream | blob | arraybuffer | text | unknown
  // Defaults to `unknown`.
  responseType: 'unknown',

  // The node.js http agent to use for the request.
  agent: someHttpsAgent,

  // Custom function to determine if the response is valid based on the
  // status code.  Defaults to (>= 200 && < 300)
  validateStatus: (status: number) => true,

  // Implementation of `fetch` to use when making the API call. By default,
  // will use the browser context if available, and fall back to `node-fetch`
  // in node.js otherwise.
  fetchImplementation?: typeof fetch;

  // Configuration for retrying of requests.
  retryConfig: {
    // The number of times to retry the request.  Defaults to 3.
    retry?: number;

    // The number of retries already attempted.
    currentRetryAttempt?: number;

    // The HTTP Methods that will be automatically retried.
    // Defaults to ['GET','PUT','HEAD','OPTIONS','DELETE']
    httpMethodsToRetry?: string[];

    // The HTTP response status codes that will automatically be retried.
    // Defaults to: [[100, 199], [429, 429], [500, 599]]
    statusCodesToRetry?: number[][];

    // Function to invoke when a retry attempt is made.
    onRetryAttempt?: (err: GaxiosError) => Promise<void> | void;

    // Function to invoke which determines if you should retry
    shouldRetry?: (err: GaxiosError) => Promise<boolean> | boolean;

    // When there is no response, the number of retries to attempt. Defaults to 2.
    noResponseRetries?: number;

    // The amount of time to initially delay the retry, in ms.  Defaults to 100ms.
    retryDelay?: number;
  },

  // Enables default configuration for retries.
  retry: boolean,

  // Cancelling a request requires the `abort-controller` library.
  // See https://github.com/bitinn/node-fetch#request-cancellation-with-abortsignal
  signal?: AbortSignal

  /**
   * An experimental, customizable error redactor.
   *
   * Set `false` to disable.
   *
   * @experimental
   */
  errorRedactor?: typeof defaultErrorRedactor | false;
}