Add eslint

.eslintrc.json

+{
+  "extends": "airbnb-base",
+  "env": {
+    "browser": true
+  },
+  "rules": {
+    "no-console": "off"
+  }
+}
\ No newline at end of file

assets/scripts/src/sholo.js

-let a = 10;
-
-alert(a);
\ No newline at end of file

package.json

@@ -10,13 +10,19 @@
   "author": "Kamran Ahmed <kamranahmed.se@gmail.com>",
   "license": "MIT",
   "devDependencies": {
+    "babel-eslint": "^8.2.2",
     "babel-loader": "^7.1.3",
     "babel-preset-env": "^1.6.1",
-    "opn": "^5.2.0",
+    "eslint": "^4.18.2",
+    "eslint-config-airbnb-base": "^12.1.0",
+    "eslint-loader": "^2.0.0",
+    "eslint-plugin-import": "^2.9.0",
+    "eslint-plugin-node": "^6.0.1",
     "webpack": "^4.0.1",
     "webpack-dev-server": "^3.1.0"
+    "babel-core": "^6.26.0",
+    "opn": "^5.2.0"
   },
   "dependencies": {
-    "babel-core": "^6.26.0"
   }
 }

server.js

 const webpack = require('webpack');
 const WebpackDevServer = require('webpack-dev-server');
-const config = require('./webpack.dev.config');
 const opn = require('opn');
 
+const config = require('./webpack.dev.config');
+
 const PORT = 3000;
 const HOST = 'localhost';
 const URL = `http://${HOST}:${PORT}`;
 
 new WebpackDevServer(webpack(config), {
-    publicPath: config.output.publicPath
-}).listen(PORT, HOST, function (error, result) {
-    if (error) {
-        console.error(error);
-    }
+  publicPath: config.output.publicPath,
+}).listen(PORT, HOST, (error, result) => {
+  if (error) {
+    console.error(error);
+  }
 
-    opn(URL);
-    console.log(`Listening at ${URL}`);
+  opn(URL);
+  console.log(`Listening at ${URL}`);
 });

webpack.dev.config.js

 const path = require('path');
 
 module.exports = {
-    mode: 'development',
-    entry: [
-        "./assets/scripts/src/sholo.js"
+  mode: 'development',
+  entry: [
+    './assets/scripts/src/sholo.js',
+  ],
+  output: {
+    publicPath: '/assets/scripts/dist/',
+    path: path.join(__dirname, 'dist'),
+    filename: 'sholo.min.js',
+    libraryTarget: 'umd',
+    library: 'Sholo',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        loader: 'eslint-loader',
+        enforce: 'pre',
+        options: {
+          failOnWarning: false,
+          failOnError: true,
+        },
+      },
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        loader: 'babel-loader',
+        options: {
+          presets: ['env'],
+        },
+      },
     ],
-    output: {
-        publicPath: '/assets/scripts/dist/',
-        path: path.join(__dirname, 'dist'),
-        filename: 'sholo.min.js',
-        libraryTarget: "umd",
-        library: "Sholo"
-    },
-    module: {
-        rules: [
-            {
-                test: /\.js$/,
-                exclude: /node_modules/,
-                loader: 'babel-loader',
-                query: {
-                    presets: ['env']
-                }
-            }
-        ]
-    },
-    stats: {
-        colors: true
-    },
-    devtool: "source-map"
-};
\ No newline at end of file
+  },
+  stats: {
+    colors: true,
+  },
+  devtool: 'source-map',
+};