Update to Webpack 4.

Author: sebadoom

package-lock.json

@@ -50,7 +50,7 @@
     "stylus": "^0.54.5",
     "uglifyjs-webpack-plugin": "^1.1.6",
     "web-ext": "^2.4.0",
-    "webpack": "^3.10.0",
+    "webpack": "^4.1.0",
     "webpack-merge": "^4.1.1",
     "xhr-mock": "^2.0.3"
   },

package.json

@@ -1,7 +1,7 @@
 const webpack = require('webpack');
 
 module.exports = {
-  devtool: 'source-map',
+  devtool: 'source-map',  
   module: {
     rules: [{
       test: /\.js$/,

webpack.common.js

@@ -3,6 +3,7 @@ const merge = require('webpack-merge');
 const common = require('./webpack.common.js');
 
 module.exports = merge(common, {
+  mode: 'development',
   entry: {
     index: './src/extension/index.js',
     webstorage: './src/extension/injected/webstorage.js',

webpack.extension-dev.js

@@ -4,6 +4,8 @@ const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 const devConfig = require('./webpack.extension-dev.js');
 
 module.exports = merge(devConfig, {
+  mode: 'production',
+  devtool: false,
   plugins: [
     new UglifyJsPlugin()
   ]

webpack.extension-prod.js

@@ -3,6 +3,7 @@ const merge = require('webpack-merge');
 const common = require('./webpack.common.js');
 
 module.exports = merge(common, {
+  mode: 'development',
   entry: {
     index: './src/website/index.js',
     introduction: './src/website/introduction/index.js'

webpack.website-dev.js

@@ -4,6 +4,8 @@ const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 const devConfig = require('./webpack.website-dev.js');
 
 module.exports = merge(devConfig, {
+  mode: 'production',
+  devtool: false,
   plugins: [
     new UglifyJsPlugin()
   ]

webpack.website-prod.js

@@ -3,6 +3,7 @@ const merge = require('webpack-merge');
 const common = require('./webpack.common.js');
 
 module.exports = merge(common, {
+  mode: 'development',
   entry: {
     'unit-tests': './test/unit/index.js'
   },