Use Prettier JS (#5017)

* Adds prettier

* Run lint before tests

src/Routers/PurgeRouter.js

@@ -3,12 +3,15 @@ import * as middleware from '../middlewares';
 import Parse from 'parse/node';
 
 export class PurgeRouter extends PromiseRouter {
-
   handlePurge(req) {
     if (req.auth.isReadOnly) {
-      throw new Parse.Error(Parse.Error.OPERATION_FORBIDDEN, 'read-only masterKey isn\'t allowed to purge a schema.');
+      throw new Parse.Error(
+        Parse.Error.OPERATION_FORBIDDEN,
+        "read-only masterKey isn't allowed to purge a schema."
+      );
     }
-    return req.config.database.purgeCollection(req.params.className)
+    return req.config.database
+      .purgeCollection(req.params.className)
       .then(() => {
         var cacheAdapter = req.config.cacheController;
         if (req.params.className == '_Session') {
@@ -16,17 +19,25 @@ export class PurgeRouter extends PromiseRouter {
         } else if (req.params.className == '_Role') {
           cacheAdapter.role.clear();
         }
-        return {response: {}};
-      }).catch((error) => {
+        return { response: {} };
+      })
+      .catch(error => {
         if (!error || (error && error.code === Parse.Error.OBJECT_NOT_FOUND)) {
-          return {response: {}};
+          return { response: {} };
         }
         throw error;
       });
   }
 
   mountRoutes() {
-    this.route('DELETE',  '/purge/:className', middleware.promiseEnforceMasterKeyAccess, (req) => { return this.handlePurge(req); });
+    this.route(
+      'DELETE',
+      '/purge/:className',
+      middleware.promiseEnforceMasterKeyAccess,
+      req => {
+        return this.handlePurge(req);
+      }
+    );
   }
 }