Refactored adapters loader; (#5277)

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

lib/adapters/adapters.js

@@ -0,0 +1,59 @@
+import utils from '../utils.js';
+import httpAdapter from './http.js';
+import xhrAdapter from './xhr.js';
+import AxiosError from "../core/AxiosError.js";
+
+const knownAdapters = {
+  http: httpAdapter,
+  xhr: xhrAdapter
+}
+
+utils.forEach(knownAdapters, (fn, value) => {
+  if(fn) {
+    try {
+      Object.defineProperty(fn, 'name', {value});
+    } catch (e) {
+      // eslint-disable-next-line no-empty
+    }
+    Object.defineProperty(fn, 'adapterName', {value});
+  }
+});
+
+export default {
+  getAdapter: (adapters) => {
+    adapters = utils.isArray(adapters) ? adapters : [adapters];
+
+    const {length} = adapters;
+    let nameOrAdapter;
+    let adapter;
+
+    for (let i = 0; i < length; i++) {
+      nameOrAdapter = adapters[i];
+      if((adapter = utils.isString(nameOrAdapter) ? knownAdapters[nameOrAdapter.toLowerCase()] : nameOrAdapter)) {
+        break;
+      }
+    }
+
+    if (!adapter) {
+      if (adapter === false) {
+        throw new AxiosError(
+          `Adapter ${nameOrAdapter} is not supported by the environment`,
+          'ERR_NOT_SUPPORT'
+        );
+      }
+
+      throw new Error(
+        utils.hasOwnProp(knownAdapters, nameOrAdapter) ?
+          `Adapter '${nameOrAdapter}' is not available in the build` :
+          `Unknown adapter '${nameOrAdapter}'`
+      );
+    }
+
+    if (!utils.isFunction(adapter)) {
+      throw new TypeError('adapter is not a function');
+    }
+
+    return adapter;
+  },
+  adapters: knownAdapters
+}

lib/adapters/http.js

@@ -100,8 +100,10 @@ function setProxy(options, configProxy, location) {
   };
 }
 
+const isHttpAdapterSupported = typeof process !== 'undefined' && utils.kindOf(process) === 'process';
+
 /*eslint consistent-return:0*/
-export default function httpAdapter(config) {
+export default isHttpAdapterSupported && function httpAdapter(config) {
   return new Promise(function dispatchHttpRequest(resolvePromise, rejectPromise) {
     let data = config.data;
     const responseType = config.responseType;

lib/adapters/index.js

@@ -1,33 +0,0 @@
-import utils from '../utils.js';
-import httpAdapter from './http.js';
-import xhrAdapter from './xhr.js';
-
-const adapters = {
-  http: httpAdapter,
-  xhr: xhrAdapter
-}
-
-export default {
-  getAdapter: (nameOrAdapter) => {
-    if(utils.isString(nameOrAdapter)){
-      const adapter = adapters[nameOrAdapter];
-
-      if (!nameOrAdapter) {
-        throw Error(
-          utils.hasOwnProp(nameOrAdapter) ?
-            `Adapter '${nameOrAdapter}' is not available in the build` :
-            `Can not resolve adapter '${nameOrAdapter}'`
-        );
-      }
-
-      return adapter
-    }
-
-    if (!utils.isFunction(nameOrAdapter)) {
-      throw new TypeError('adapter is not a function');
-    }
-
-    return nameOrAdapter;
-  },
-  adapters
-}

lib/adapters/xhr.js

@@ -43,7 +43,9 @@ function progressEventReducer(listener, isDownloadStream) {
   };
 }
 
-export default function xhrAdapter(config) {
+const isXHRAdapterSupported = typeof XMLHttpRequest !== 'undefined';
+
+export default isXHRAdapterSupported && function (config) {
   return new Promise(function dispatchXhrRequest(resolve, reject) {
     let requestData = config.data;
     const requestHeaders = AxiosHeaders.from(config.headers).normalize();