Fix usage of webpack-merge

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: Build
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Build
+    steps:
+      - uses: actions/checkout@master
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - name: npm install
+        run: npm ci
+      - name: build
+        run: npm run build
+    env:
+      CI: true

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')
 const TerserPlugin = require('terser-webpack-plugin')