No default export available anymore

Signed-off-by: Joas Schilling <coding@schilljs.com>

package-lock.json

@@ -16859,7 +16859,8 @@
 			"version": "1.19.1",
 			"resolved": "https://registry.npmjs.org/prettier/-/prettier-1.19.1.tgz",
 			"integrity": "sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==",
-			"dev": true
+			"dev": true,
+			"optional": true
 		},
 		"pretty": {
 			"version": "2.0.0",

webpack.dev.js

@@ -1,4 +1,4 @@
-const merge = require('webpack-merge')
+const { merge } = require('webpack-merge')
 const common = require('./webpack.common.js')
 
 module.exports = merge(common, {

webpack.prod.js

@@ -1,4 +1,4 @@
-const merge = require('webpack-merge')
+const { merge } = require('webpack-merge')
 const common = require('./webpack.common.js')
 
 module.exports = merge(common, {