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27 lines
570 B
JavaScript
27 lines
570 B
JavaScript
'use strict'; // eslint-disable-line
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const net = require('net');
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// using a free port instead of a constant port enables parallelization
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function getFreePort() {
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return new Promise((resolve, reject) => {
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const server = net.createServer();
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let port;
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server.on('listening', function() {
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port = server.address().port;
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server.close();
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});
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server.on('close', function() {
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resolve(port);
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});
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server.on('error', function(error) {
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reject(error);
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});
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server.listen(0);
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});
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}
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module.exports = {
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getFreePort
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};
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