Only search for free port once

We already do that in `normalizeOptions` now

.changeset/blue-trains-drum.md

@@ -0,0 +1,5 @@
+---
+'wmr': patch
+---
+
+Only search for free port once in dev mode

packages/wmr/src/start.js

@@ -1,6 +1,6 @@
 import server from './server.js';
 import wmrMiddleware from './wmr-middleware.js';
-import { getFreePort, getServerAddresses, isPortFree } from './lib/net-utils.js';
+import { getServerAddresses } from './lib/net-utils.js';
 import { normalizeOptions } from './lib/normalize-options.js';
 import { setCwd } from './plugins/npm-plugin/registry.js';
 import { formatBootMessage } from './lib/output-utils.js';
@@ -21,19 +21,6 @@ export default async function start(options = {}) {
 
 	options = await normalizeOptions(options, 'start');
 
-	// Don't use another free port if the user explicitely
-	// requested a specific one.
-	const userPort = options.port || process.env.PORT;
-	if (userPort !== undefined) {
-		if (await isPortFree(+userPort)) {
-			options.port = +userPort;
-		} else {
-			throw new Error(`Another process is already running on port ${userPort}. Please choose a different port.`);
-		}
-	} else {
-		options.port = await getFreePort(8080);
-	}
-
 	options.host = options.host || process.env.HOST;
 
 	options.middleware = [].concat(