Revert "Update Webpack + deps, remove now unnecessary polyfills" (#2479)

* Revert "Update Webpack + deps, remove now unnecessary polyfills (#2410)"

This reverts commit 189b34c45a.

* Fix build (#2496)

* Change syntax to see if build passes

* Test commit

* Test with node 10

* Test adding all browsers in travis

* remove other browsers when running on travis

lib/core/enhanceError.js

@@ -20,7 +20,7 @@ module.exports = function enhanceError(error, config, code, request, response) {
   error.response = response;
   error.isAxiosError = true;
 
-  error.toJSON = function toJSON() {
+  error.toJSON = function() {
     return {
       // Standard
       message: this.message,

lib/helpers/buildURL.js

@@ -39,7 +39,7 @@ module.exports = function buildURL(url, params, paramsSerializer) {
         return;
       }
 
-      if (Array.isArray(val)) {
+      if (utils.isArray(val)) {
         key = key + '[]';
       } else {
         val = [val];

lib/helpers/parseHeaders.js

@@ -34,8 +34,8 @@ module.exports = function parseHeaders(headers) {
 
   utils.forEach(headers.split('\n'), function parser(line) {
     i = line.indexOf(':');
-    key = line.substr(0, i).trim().toLowerCase();
-    val = line.substr(i + 1).trim();
+    key = utils.trim(line.substr(0, i)).toLowerCase();
+    val = utils.trim(line.substr(i + 1));
 
     if (key) {
       if (parsed[key] && ignoreDuplicateOf.indexOf(key) >= 0) {

lib/utils.js

@@ -3,9 +3,21 @@
 var bind = require('./helpers/bind');
 var isBuffer = require('is-buffer');
 
+/*global toString:true*/
+
 // utils is a library of generic helper functions non-specific to axios
 
-var _toString = Object.prototype.toString;
+var toString = Object.prototype.toString;
+
+/**
+ * Determine if a value is an Array
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is an Array, otherwise false
+ */
+function isArray(val) {
+  return toString.call(val) === '[object Array]';
+}
 
 /**
  * Determine if a value is an ArrayBuffer
@@ -14,7 +26,7 @@ var _toString = Object.prototype.toString;
  * @returns {boolean} True if value is an ArrayBuffer, otherwise false
  */
 function isArrayBuffer(val) {
-  return _toString.call(val) === '[object ArrayBuffer]';
+  return toString.call(val) === '[object ArrayBuffer]';
 }
 
 /**
@@ -90,7 +102,7 @@ function isObject(val) {
  * @returns {boolean} True if value is a Date, otherwise false
  */
 function isDate(val) {
-  return _toString.call(val) === '[object Date]';
+  return toString.call(val) === '[object Date]';
 }
 
 /**
@@ -100,7 +112,7 @@ function isDate(val) {
  * @returns {boolean} True if value is a File, otherwise false
  */
 function isFile(val) {
-  return _toString.call(val) === '[object File]';
+  return toString.call(val) === '[object File]';
 }
 
 /**
@@ -110,7 +122,7 @@ function isFile(val) {
  * @returns {boolean} True if value is a Blob, otherwise false
  */
 function isBlob(val) {
-  return _toString.call(val) === '[object Blob]';
+  return toString.call(val) === '[object Blob]';
 }
 
 /**
@@ -120,7 +132,7 @@ function isBlob(val) {
  * @returns {boolean} True if value is a Function, otherwise false
  */
 function isFunction(val) {
-  return _toString.call(val) === '[object Function]';
+  return toString.call(val) === '[object Function]';
 }
 
 /**
@@ -143,6 +155,16 @@ function isURLSearchParams(val) {
   return typeof URLSearchParams !== 'undefined' && val instanceof URLSearchParams;
 }
 
+/**
+ * Trim excess whitespace off the beginning and end of a string
+ *
+ * @param {String} str The String to trim
+ * @returns {String} The String freed of excess whitespace
+ */
+function trim(str) {
+  return str.replace(/^\s*/, '').replace(/\s*$/, '');
+}
+
 /**
  * Determine if we're running in a standard browser environment
  *
@@ -194,7 +216,7 @@ function forEach(obj, fn) {
     obj = [obj];
   }
 
-  if (Array.isArray(obj)) {
+  if (isArray(obj)) {
     // Iterate over array values
     for (var i = 0, l = obj.length; i < l; i++) {
       fn.call(null, obj[i], i, obj);
@@ -288,6 +310,7 @@ function extend(a, b, thisArg) {
 }
 
 module.exports = {
+  isArray: isArray,
   isArrayBuffer: isArrayBuffer,
   isBuffer: isBuffer,
   isFormData: isFormData,
@@ -306,5 +329,6 @@ module.exports = {
   forEach: forEach,
   merge: merge,
   deepMerge: deepMerge,
-  extend: extend
+  extend: extend,
+  trim: trim
 };