fliphub-monorepo
Version:
the builder of builders
20 lines (18 loc) • 551 B
JavaScript
// https://github.com/codekirei/first-open-port
module.exports = function firstOpenPort(port, max) {
var net = require('net')
max = max || 65535
var err = `no ports open from ${port} to ${max}`
return new Promise((resolve, reject) =>
(function test() {
var server = net.createServer()
server.on('error', () => {
if ((port += 1) <= max) test()
else reject(new Error(err))
})
server.on('listening', server.close)
server.on('close', () => resolve(port))
server.listen(port)
})()
)
}