Axios ES2017 (#4787)

* Added AxiosHeaders class;

* Fixed README.md href;

* Fixed a potential bug with headers normalization;

* Fixed a potential bug with headers normalization;
Refactored accessor building routine;
Refactored default transforms;
Removed `normalizeHeaderName` helper;

* Added `Content-Length` accessor;
Added missed `has` accessor to TS types;

* Added `AxiosTransformStream` class;
Added progress capturing ability for node.js environment;
Added `maxRate` option to limit the data rate in node.js environment;
Refactored event handled by `onUploadProgress` && `onDownloadProgress` listeners in browser environment;
Added progress & data rate tests for the http adapter;
Added response stream aborting test;
Added a manual progress capture test for the browser;
Updated TS types;
Added TS tests;
Refactored request abort logic for the http adapter;
Added ability to abort the response stream;

* Remove `stream/promises` & `timers/promises` modules usage in tests;

* Use `abortcontroller-polyfill`;

* Fixed AxiosTransformStream dead-lock in legacy node versions;
Fixed CancelError emitting in streams;

* Reworked AxiosTransformStream internal logic to optimize memory consumption;
Added throwing an error if the request stream was silently destroying (without error) Refers to #3966;

* Treat the destruction of the request stream as a cancellation of the request;
Fixed tests;

* Emit `progress` event in the next tick;

* Initial refactoring;

* Refactored Mocha tests to use ESM;

* Refactored Karma tests to use rollup preprocessor & ESM;
Replaced grunt with gulp;
Improved dev scripts;
Added Babel for rollup build;

* Added default commonjs package export for Node build;
Added automatic contributors list generator for package.json;

Co-authored-by: Jay <jasonsaayman@gmail.com>

test/specs/basicAuth.spec.js

@@ -1,3 +1,77 @@
+import axios from "../../index";
+
+function validateInvalidCharacterError(error) {
+  expect(/character/i.test(error.message)).toEqual(true);
+};
+
 describe('basicAuth', function () {
-  setupBasicAuthTest();
+  // Validate an invalid character error
+  beforeEach(function () {
+    jasmine.Ajax.install();
+  });
+
+  afterEach(function () {
+    jasmine.Ajax.uninstall();
+  });
+
+  it('should accept HTTP Basic auth with username/password', function (done) {
+    axios('/foo', {
+      auth: {
+        username: 'Aladdin',
+        password: 'open sesame'
+      }
+    });
+
+    setTimeout(function () {
+      const request = jasmine.Ajax.requests.mostRecent();
+
+      expect(request.requestHeaders['Authorization']).toEqual('Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==');
+      done();
+    }, 100);
+  });
+
+  it('should accept HTTP Basic auth credentials without the password parameter', function (done) {
+    axios('/foo', {
+      auth: {
+        username: 'Aladdin'
+      }
+    });
+
+    setTimeout(function () {
+      const request = jasmine.Ajax.requests.mostRecent();
+
+      expect(request.requestHeaders['Authorization']).toEqual('Basic QWxhZGRpbjo=');
+      done();
+    }, 100);
+  });
+
+  it('should accept HTTP Basic auth credentials with non-Latin1 characters in password', function (done) {
+    axios('/foo', {
+      auth: {
+        username: 'Aladdin',
+        password: 'open ßç£☃sesame'
+      }
+    });
+
+    setTimeout(function () {
+      const request = jasmine.Ajax.requests.mostRecent();
+
+      expect(request.requestHeaders['Authorization']).toEqual('Basic QWxhZGRpbjpvcGVuIMOfw6fCo+KYg3Nlc2FtZQ==');
+      done();
+    }, 100);
+  });
+
+  it('should fail to encode HTTP Basic auth credentials with non-Latin1 characters in username', function (done) {
+    axios('/foo', {
+      auth: {
+        username: 'Aladßç£☃din',
+        password: 'open sesame'
+      }
+    }).then(function (response) {
+      done(new Error('Should not succeed to make a HTTP Basic auth request with non-latin1 chars in credentials.'));
+    }).catch(function (error) {
+      validateInvalidCharacterError(error);
+      done();
+    });
+  });
 });