fix: shutdown dev server on fatal error (#143)

* Fix dev server restart error

* chore: apply review changes

Co-authored-by: Luke Edwards <luke.edwards05@gmail.com>

rollup.config.js

@@ -6,6 +6,27 @@ import { terser } from 'rollup-plugin-terser';
 
 const production = !process.env.ROLLUP_WATCH;
 
+function serve() {
+	let server;
+	
+	function toExit() {
+		if (server) server.kill(0);
+	}
+
+	return {
+		writeBundle() {
+			if (server) return;
+			server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
+				stdio: ['ignore', 'inherit', 'inherit'],
+				shell: true
+			});
+
+			process.on('SIGTERM', toExit);
+			process.on('exit', toExit);
+		}
+	};
+}
+
 export default {
 	input: 'src/main.js',
 	output: {
@@ -52,20 +73,3 @@ export default {
 		clearScreen: false
 	}
 };
-
-function serve() {
-	let started = false;
-
-	return {
-		writeBundle() {
-			if (!started) {
-				started = true;
-
-				require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
-					stdio: ['ignore', 'inherit', 'inherit'],
-					shell: true
-				});
-			}
-		}
-	};
-}