Rename *.es6 to *.js

*.es6 isn't standard naming, that was just an old cockpit-ism. All files
are treated as ES6.

Makefile

@@ -21,7 +21,7 @@ LINGUAS=$(basename $(notdir $(wildcard po/*.po)))
 
 po/POTFILES.js.in:
 	mkdir -p $(dir $@)
-	find src/ -name '*.js' -o -name '*.jsx' -o -name '*.es6' > $@
+	find src/ -name '*.js' -o -name '*.jsx' > $@
 
 po/$(PACKAGE_NAME).js.pot: po/POTFILES.js.in
 	xgettext --default-domain=cockpit --output=$@ --language=C --keyword= \

README.md

@@ -46,7 +46,7 @@ or
 # Running eslint
 
 Cockpit Starter Kit uses [ESLint](https://eslint.org/) to automatically check
-JavaScript code style in `.jsx` and `.es6` files.
+JavaScript code style in `.js` and `.jsx` files.
 
 The linter is executed within every build as a webpack preloader.
 

package.json

@@ -9,8 +9,8 @@
   "scripts": {
     "watch": "webpack --watch",
     "build": "webpack",
-    "eslint": "eslint --ext .jsx --ext .es6 src/",
-    "eslint:fix": "eslint --fix --ext .jsx --ext .es6 src/"
+    "eslint": "eslint --ext .js --ext .jsx src/",
+    "eslint:fix": "eslint --fix --ext .js --ext .jsx src/"
   },
   "devDependencies": {
     "@babel/core": "^7.0.0",

webpack.config.js

@@ -22,7 +22,7 @@ var production = process.env.NODE_ENV === 'production';
 var info = {
     entries: {
         "index": [
-            "./index.es6"
+            "./index.js"
         ]
     },
     files: [
@@ -125,28 +125,12 @@ module.exports = {
                 enforce: 'pre',
                 exclude: /node_modules/,
                 loader: 'eslint-loader',
-                test: /\.jsx$/
-            },
-            {
-                enforce: 'pre',
-                exclude: /node_modules/,
-                loader: 'eslint-loader',
-                test: /\.es6$/
+                test: /\.(js|jsx)$/
             },
             {
                 exclude: /node_modules/,
                 use: babel_loader,
-                test: /\.js$/
-            },
-            {
-                exclude: /node_modules/,
-                use: babel_loader,
-                test: /\.jsx$/
-            },
-            {
-                exclude: /node_modules/,
-                use: babel_loader,
-                test: /\.es6$/
+                test: /\.(js|jsx)$/
             },
             {
                 exclude: /node_modules/,