29 lines
590 B
JavaScript
29 lines
590 B
JavaScript
|
'use strict';
|
||
|
|
const net = require('net');
|
||
|
|
|
||
|
|
const getPort = options => new Promise((resolve, reject) => {
|
||
|
|
// For backwards compatibility with number-only input
|
||
|
|
// TODO: Remove this in the next major version
|
||
|
|
if (typeof options === 'number') {
|
||
|
|
options = {
|
||
|
|
port: options
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
const server = net.createServer();
|
||
|
|
|
||
|
|
server.unref();
|
||
|
|
server.on('error', reject);
|
||
|
|
|
||
|
|
server.listen(options, () => {
|
||
|
|
const port = server.address().port;
|
||
|
|
server.close(() => {
|
||
|
|
resolve(port);
|
||
|
|
});
|
||
|
|
});
|
||
|
|
});
|
||
|
|
|
||
|
|
module.exports = options => options ?
|
||
|
|
getPort(options).catch(() => getPort(0)) :
|
||
|
|
getPort(0);
|