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