Fixed sourcemap generation script

server/package.json

@@ -5,6 +5,7 @@
 	"scripts": {
 		"start": "node dist/app.js",
 		"build": "webpack --env production",
+		"sourcemap": "webpack --env production sourcemap",
 		"prewatch": "yarn lint-build",
 		"watch": "webpack --watch",
 		"lint": "eslint \"./{src, tests}/**\" --fix",

server/webpack.config.js

@@ -5,9 +5,9 @@ const NodemonPlugin = require('nodemon-webpack-plugin')
 module.exports = env => {
 	const isProduction = !!env.production
 	const generateSourceMap = !!env.sourcemap
-	let devtool = false
-	if (!isProduction) {
-		devtool = generateSourceMap ? 'source-map' : 'eval'
+	let devtool = 'eval'
+	if (isProduction) {
+		devtool = generateSourceMap ? 'source-map' : false
 	}
 	const config = {
 		mode: isProduction ? 'production' : 'development',