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'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);