chore: implement PR feedback

Author: simschla

lib/src/main/java/com/diffplug/spotless/npm/NpmResourceHelper.java

@@ -32,6 +32,9 @@
 import com.diffplug.spotless.ThrowingEx;
 
 final class NpmResourceHelper {
+
+	public static final String MD5_STRING_DELIMITER = "@@@";
+
 	private NpmResourceHelper() {
 		// no instance required
 	}
@@ -143,11 +146,11 @@ static String md5(File file) {
 
 	static String md5(String fileContent, String... additionalFileContents) {
 		Objects.requireNonNull(fileContent, "fileContent must not be null");
-		Stream<String> additionalFilecontentStream = Stream.concat(
+		Stream<String> additionalFileContentStream = Stream.concat(
 				Stream.of(fileContent),
 				Stream.of(additionalFileContents));
 		MessageDigest md = ThrowingEx.get(() -> MessageDigest.getInstance("MD5"));
-		String stringToHash = additionalFilecontentStream.collect(Collectors.joining("@@@"));
+		String stringToHash = additionalFileContentStream.collect(Collectors.joining(MD5_STRING_DELIMITER));
 		md.update(stringToHash.getBytes(StandardCharsets.UTF_8));
 
 		byte[] digest = md.digest();

lib/src/main/resources/com/diffplug/spotless/npm/common-serve.js

@@ -1,6 +1,6 @@
 // this file will be glued to the top of the specific xy-serve.js file
 const debug_serve = false; // set to true for debug log output in node process
-const gracefulShutdown = require("http-graceful-shutdown");
+const shutdownServer = require("http-graceful-shutdown");
 const express = require("express");
 const app = express();
 
@@ -48,14 +48,18 @@ var listener = app.listen(0, "127.0.0.1", () => {
 		}
 	});
 });
-const shutdown = gracefulShutdown(listener, {
+const shutdown = shutdownServer(listener, {
 	forceExit: false, // let the event loop clear
 	finally: () => debugLog("graceful shutdown finished."),
 });
 
 app.post("/shutdown", (req, res) => {
 	res.status(200).send("Shutting down");
 	setTimeout(async () => {
-		await shutdown()
+		try {
+			await shutdown();
+		} catch (err) {
+			console.error("Error during shutdown:", err);
+		}
 	}, 200);
 });