Clean up PR

lib/axios.js

@@ -32,7 +32,7 @@ axios.Axios = Axios;
 
 // Factory for creating new instances
 axios.create = function create(instanceConfig) {
-  return createInstance(utils.mergeConfig(axios.defaults, instanceConfig || {}));
+  return createInstance(utils.mergeConfig(axios.defaults, instanceConfig));
 };
 
 // Expose Cancel & CancelToken

lib/core/Axios.js

@@ -23,21 +23,17 @@ function Axios(instanceConfig) {
  * @param {Object} config The config specific for this request (merged with this.defaults)
  */
 Axios.prototype.request = function request(config) {
-  config = config || {};
-
   /*eslint no-param-reassign:0*/
   // Allow for axios('example/url'[, config]) a la fetch API
   if (typeof config === 'string') {
     config = arguments[1] || {};
     config.url = arguments[0];
-  }
-
-  if (!config.method) {
-    config.method = 'get';
+  } else {
+    config = config || {};
   }
 
   config = utils.mergeConfig(this.defaults, config);
-  config.method = config.method.toLowerCase();
+  config.method = config.method ? config.method.toLowerCase() : 'get';
 
   // Hook up interceptors middleware
   var chain = [dispatchRequest, undefined];

lib/utils.js

@@ -279,47 +279,39 @@ function extend(a, b, thisArg) {
   return a;
 }
 
+
+/**
+ * Config-specific merge-function which creates a new config-object
+ * based on given defaults and instance config.
+ *
+ * @param {Object} defaults Defaults
+ * @param {Object} instanceConfig Instance-specific config
+ * @returns {Object} New object resulting from merging instanceConfig to defaults
+ */
 function mergeConfig(defaults, instanceConfig) {
+  instanceConfig = instanceConfig || {};
   var config = {};
-  forEach(['url', 'method', 'params', 'data'], function(prop) {
+  forEach(['url', 'method', 'params', 'data'], function valueFromInstanceConfig(prop) {
     config[prop] = instanceConfig[prop];
   });
-  forEach(['headers', 'auth', 'proxy'], function(prop) {
+  forEach(['headers', 'auth', 'proxy'], function mergeInstanceConfigWithDefaults(prop) {
     if (!isUndefined(instanceConfig[prop])) {
-      if (!isObject(instanceConfig[prop])) {
-        config[prop] = instanceConfig[prop];
+      if (isObject(instanceConfig[prop])) {
+        config[prop] = merge(defaults[prop], instanceConfig[prop]);
       } else {
-        config[prop] = merge(
-          defaults[prop],
-          instanceConfig[prop]
-        );
+        config[prop] = instanceConfig[prop];
       }
     } else if (!isUndefined(defaults[prop])) {
       config[prop] = JSON.parse(JSON.stringify(defaults[prop]));
     }
   });
-  var remainingProperties = [
-    'baseURL',
-    'transformRequest',
-    'transformResponse',
-    'paramsSerializer',
-    'timeout',
-    'withCredentials',
-    'adapter',
-    'responseType',
-    'xsrfCookieName',
-    'xsrfHeaderName',
-    'onUploadProgress',
-    'onDownloadProgress',
-    'maxContentLength',
-    'validateStatus',
-    'maxRedirects',
-    'httpAgent',
-    'httpsAgent',
-    'cancelToken'
-  ];
-  forEach(remainingProperties, function(prop) {
-    config[prop] = !isUndefined(instanceConfig[prop]) ? instanceConfig[prop] : defaults[prop];
+  forEach([
+    'baseURL', 'transformRequest', 'transformResponse', 'paramsSerializer',
+    'timeout', 'withCredentials', 'adapter', 'responseType', 'xsrfCookieName',
+    'xsrfHeaderName', 'onUploadProgress', 'onDownloadProgress', 'maxContentLength',
+    'validateStatus', 'maxRedirects', 'httpAgent', 'httpsAgent', 'cancelToken'
+  ], function defaultToInstanceConfig(prop) {
+    config[prop] = isUndefined(instanceConfig[prop]) ? defaults[prop] : instanceConfig[prop];
   });
   return config;
 }