Remove devtool from production bundle

.github/workflows/core-ci-checks.yml

@@ -8,10 +8,10 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
           node-version: lts/*
           cache: 'yarn'
@@ -27,3 +27,6 @@ jobs:
 
       - name: Tests
         run: yarn test:int
+
+      - name: Build smoke check package
+        run: yarn package

webpack.prod.js

@@ -3,7 +3,9 @@ const common = require('./webpack.common.js');
 
 module.exports = merge(common, {
   mode: 'production',
-  devtool: 'eval',
+  // By removing source map generation, we reduce bundle size by 50%.
+  // See https://webpack.js.org/configuration/devtool/ for more details.
+  devtool: false,
   optimization: {
     minimize: true,
   },