chore: revert to webpack 3

Author: d4rkr00t

.build/webpack.config.umd.js

@@ -5,14 +5,16 @@ const BundleAnalyzerPlugin = require("webpack-bundle-analyzer")
 
 module.exports = {
   entry: "./src",
-  mode: "production",
   output: {
     filename: "prosemirror-dev-tools.min.js",
     path: path.resolve(__dirname, "..", "dist", "umd"),
     library: "ProseMirrorDevTools",
     libraryTarget: "umd"
   },
   plugins: [
+    new webpack.optimize.UglifyJsPlugin({
+      compress: { warnings: false }
+    }),
     new webpack.DefinePlugin({ "process.env.NODE_ENV": '"production"' }),
     new BundleAnalyzerPlugin({
       analyzerMode: "static",

package.json

@@ -74,9 +74,8 @@
     "react": "^16.4.1",
     "react-dom": "^16.4.1",
     "rimraf": "^2.6.2",
-    "webpack": "^4.16.0",
-    "webpack-bundle-analyzer": "^2.13.1",
-    "webpack-cli": "^3.0.8"
+    "webpack": "^3.9.1",
+    "webpack-bundle-analyzer": "^2.10.1"
   },
   "eslintConfig": {
     "extends": "./node_modules/aik/lib/eslint-config.js"