1 files changed, 20 insertions, 0 deletions
diff --git a/node_modules/get-port/index.js b/node_modules/get-port/index.js
new file mode 100644
index 000000000..de99a3662
--- /dev/null
+++ b/node_modules/get-port/index.js
@@ -0,0 +1,20 @@
+'use strict';
+const net = require('net');
+
+const getPort = port => new Promise((resolve, reject) => {
+	const server = net.createServer();
+
+	server.unref();
+	server.on('error', reject);
+
+	server.listen(port, () => {
+		const port = server.address().port;
+		server.close(() => {
+			resolve(port);
+		});
+	});
+});
+
+module.exports = preferredPort => preferredPort ?
+	getPort(preferredPort).catch(() => getPort(0)) :
+	getPort(0);