blob: de99a36626eb55089f097ff94e017110967d193f (
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'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);
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