Fixed missed minified builds; (#4805)

* Fixed missed minified builds;
Refactored utils.js;
Refactored `utils.isStandardBrowserEnv()` as a `platform/browser` property;
Added builds size log;

* Replaced `rollup-plugin-filesize` with `rollup-plugin-bundle-size`;

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

lib/platform/browser/index.js

@@ -1,6 +1,36 @@
 import URLSearchParams from './classes/URLSearchParams.js'
 import FormData from './classes/FormData.js'
 
+/**
+ * Determine if we're running in a standard browser environment
+ *
+ * This allows axios to run in a web worker, and react-native.
+ * Both environments support XMLHttpRequest, but not fully standard globals.
+ *
+ * web workers:
+ *  typeof window -> undefined
+ *  typeof document -> undefined
+ *
+ * react-native:
+ *  navigator.product -> 'ReactNative'
+ * nativescript
+ *  navigator.product -> 'NativeScript' or 'NS'
+ *
+ * @returns {boolean}
+ */
+const isStandardBrowserEnv = (() => {
+  let product;
+  if (typeof navigator !== 'undefined' && (
+    (product = navigator.product) === 'ReactNative' ||
+    product === 'NativeScript' ||
+    product === 'NS')
+  ) {
+    return false;
+  }
+
+  return typeof window !== 'undefined' && typeof document !== 'undefined';
+})();
+
 export default {
   isBrowser: true,
   classes: {
@@ -8,5 +38,6 @@ export default {
     FormData,
     Blob
   },
+  isStandardBrowserEnv,
   protocols: ['http', 'https', 'file', 'blob', 'url', 'data']
 };