change webpack setting: include source map only in dev build

package.json

@@ -43,6 +43,6 @@
 		"test-with-coverage": "nyc --reporter=text mocha --require ts-node/register",
 		"test-all-with-coverage": "nyc --reporter=text mocha --require ts-node/register './src/**/*.test.ts'",
 		"webpack": "webpack --mode=production",
-		"dev-server": "webpack serve --mode=development"
+		"dev-server": "webpack serve --mode=development --devtool=eval-source-map"
 	}
 }

webpack.config.js

@@ -2,7 +2,6 @@ const path = require('path');
 
 module.exports = {
   entry: path.resolve(__dirname, 'src', 'frontend', 'index.tsx'),
-  devtool: 'eval-source-map',
   module: {
     rules: [
       {