update code style

karma.conf.js

@@ -1,30 +1,33 @@
-var webpackConfig = require('./webpack.config.js');
+var webpackConfig = require("./webpack.config.js");
 
 module.exports = function (karma) {
-    karma.set({
-        plugins: ['karma-webpack', 'karma-chai', 'karma-sinon', 'karma-mocha', 'karma-chrome-launcher'],
+  karma.set({
+    plugins: [
+      "karma-webpack",
+      "karma-chai",
+      "karma-sinon",
+      "karma-mocha",
+      "karma-chrome-launcher",
+    ],
 
-        frameworks: ['chai', 'sinon', 'mocha'],
+    frameworks: ["chai", "sinon", "mocha"],
 
-        files: [
-            'src/**/*.js',
-            'test/**/*.js',
-        ],
+    files: ["src/**/*.js", "test/**/*.js"],
 
-        preprocessors: {
-            'src/**/*.js': ['webpack'],
-            'test/**/*.js': ['webpack']
-        },
+    preprocessors: {
+      "src/**/*.js": ["webpack"],
+      "test/**/*.js": ["webpack"],
+    },
 
-        webpack: {
-            module: webpackConfig.module,
-            plugins: webpackConfig.plugins
-        },
+    webpack: {
+      module: webpackConfig.module,
+      plugins: webpackConfig.plugins,
+    },
 
-        webpackMiddleware: {
-            stats: 'errors-only'
-        },
+    webpackMiddleware: {
+      stats: "errors-only",
+    },
 
-        browsers: ['ChromeHeadless']
-    });
+    browsers: ["ChromeHeadless"],
+  });
 };