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web-dev-server.config.mjs

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+// import { hmrPlugin, presets } from '@open-wc/dev-server-hmr';
+
+/** Use Hot Module replacement by adding --hmr to the start command */
+const hmr = process.argv.includes('--hmr');
+
+export default /** @type {import('@web/dev-server').DevServerConfig} */ ({
+  nodeResolve: true,
+  open: '/',
+  watch: !hmr,
+
+  /** Compile JS for older browsers. Requires @web/dev-server-esbuild plugin */
+  // esbuildTarget: 'auto'
+
+  /** Set appIndex to enable SPA routing */
+  // appIndex: 'demo/index.html',
+
+  /** Confgure bare import resolve plugin */
+  // nodeResolve: {
+  //   exportConditions: ['browser', 'development']
+  // },
+
+  plugins: [
+    /** Use Hot Module Replacement by uncommenting. Requires @open-wc/dev-server-hmr plugin */
+    // hmr && hmrPlugin({ exclude: ['**/*/node_modules/**/*'], presets: [presets.litElement] }),
+  ],
+
+  // See documentation for all available options
+});