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web-dev-server.config.js

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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} */ ({
+	open: "/",
+	watch: !hmr,
+	/** Resolve bare module imports */
+	nodeResolve: {
+		exportConditions: ["browser", "development"],
+	},
+
+	/** Compile JS for older browsers. Requires @web/dev-server-esbuild plugin */
+	// esbuildTarget: "auto"
+
+	/** Set appIndex to enable SPA routing */
+	appIndex: "./index.html",
+
+	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
+});