upgraded build tools

.babelrc

@@ -1,3 +0,0 @@
-{
-  "presets": ["env"]
-}

package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "./public/js/tessellate.js",
   "scripts": {
-    "build": "webpack --mode production",
+    "build:dev": "webpack --mode development",
+    "build:prod": "webpack --mode production",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
@@ -18,10 +19,10 @@
   },
   "homepage": "https://gitea.daggertrout.com/mcdoh/Tessellate#README",
   "devDependencies": {
-    "babel-core": "^6.26.3",
-    "babel-loader": "^7.1.4",
-    "babel-preset-env": "^1.7.0",
-    "webpack": "^4.12.0",
-    "webpack-cli": "^3.0.8"
+    "@babel/core": "^7.2.2",
+    "@babel/preset-env": "^7.3.1",
+    "babel-loader": "^8.0.5",
+    "webpack": "^4.29.0",
+    "webpack-cli": "^3.2.1"
   }
 }

webpack.config.js

@@ -1,4 +1,5 @@
-var path = require('path');
+const path = require('path');
+const mode = process.argv.slice(-1)[0];
 
 module.exports = {
 	entry: {
@@ -10,13 +11,16 @@ module.exports = {
 		path: path.join(__dirname, 'public', 'js'),
 		filename: '[name].js'
 	},
-	devtool: 'inline-source-map',
+	devtool: mode === 'development' ? 'inline-source-map' : '',
 	module: {
 		rules: [
 			{
 				test: path.join(__dirname, 'src'),
 				use: {
-					loader: 'babel-loader'
+					loader: 'babel-loader',
+					options: {
+						presets: ['@babel/preset-env']
+					}
 				}
 			}
 		]