refactor!: Remove options.ts (#1920)

* refactor!: Remove `options.ts`

* chore: clean-up

* test: remove unnecessary test

Author: d-goog

src/options.ts

@@ -19,9 +19,7 @@ import {
   GaxiosPromise,
   GaxiosResponse,
 } from 'gaxios';
-import {validate} from './options';
 
-// eslint-disable-next-line @typescript-eslint/no-var-requires
 const pkg = require('../../package.json');
 
 const PRODUCT_NAME = 'google-api-nodejs-client';
@@ -85,7 +83,6 @@ export class DefaultTransporter implements Transporter {
   request<T>(opts: GaxiosOptions): GaxiosPromise<T> {
     // ensure the user isn't passing in request-style options
     opts = this.configure(opts);
-    validate(opts);
     return this.instance.request<T>(opts).catch(e => {
       throw this.processError(e);
     });

src/transporters.ts

@@ -121,16 +121,6 @@ describe('transporters', () => {
     );
   });
 
-  it('should return an error if you try to use request config options with a promise', async () => {
-    const expected = new RegExp(
-      "'uri' is not a valid configuration option. Please use 'url' instead. This " +
-        'library is using Axios for requests. Please see https://github.com/axios/axios ' +
-        'to learn more about the valid request options.'
-    );
-    const uri = 'http://example.com/api';
-    assert.throws(() => transporter.request({uri} as GaxiosOptions), expected);
-  });
-
   it('should support invocation with async/await', async () => {
     const url = 'http://example.com';
     const scope = nock(url).get('/').reply(200);