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>

rollup.config.js

@@ -2,13 +2,15 @@ import resolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
 import {terser} from "rollup-plugin-terser";
 import json from '@rollup/plugin-json';
+import { babel } from '@rollup/plugin-babel';
+import autoExternal from 'rollup-plugin-auto-external';
 
 const lib = require("./package.json");
 const outputFileName = 'axios';
 const name = "axios";
 const input = './lib/axios.js';
 
-const buildConfig = (config) => {
+const buildConfig = ({es5, browser = true, minifiedVersion = true, ...config}) => {
 
   const build = ({minified}) => ({
     input,
@@ -19,25 +21,35 @@ const buildConfig = (config) => {
     },
     plugins: [
       json(),
-      resolve({browser: true}),
+      resolve({browser}),
       commonjs(),
       minified && terser(),
+      ...(es5 ? [babel({
+        babelHelpers: 'bundled',
+        presets: ['@babel/preset-env']
+      })] : []),
       ...(config.plugins || []),
     ]
   });
 
-  return [
+  const configs = [
     build({minified: false}),
-    build({minified: true}),
   ];
+
+  if (minifiedVersion) {
+    build({minified: true})
+  }
+
+  return configs;
 };
 
 export default async () => {
   const year = new Date().getFullYear();
-  const banner = `// ${lib.name} v${lib.version} Copyright (c) ${year} ${lib.author}`;
+  const banner = `// Axios v${lib.version} Copyright (c) ${year} ${lib.author} and contributors`;
 
   return [
     ...buildConfig({
+      es5: true,
       output: {
         file: `dist/${outputFileName}`,
         name,
@@ -55,6 +67,22 @@ export default async () => {
         exports: "named",
         banner
       }
-    })
+    }),
+    // Node.js commonjs build
+    {
+      input,
+      output: {
+        file: `dist/node/${name}.cjs`,
+        format: "cjs",
+        preferConst: true,
+        exports: "default",
+        banner
+      },
+      plugins: [
+        autoExternal(),
+        resolve(),
+        commonjs()
+      ]
+    }
   ]
 };