| 1 | 'use strict'
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| 2 |
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| 3 | const { createServer } = require('net')
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| 4 |
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| 5 | function getPort (port = 3000, host = '127.0.0.1') {
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| 6 | const server = createServer()
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| 7 | return new Promise((resolve, reject) => {
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| 8 | server.on('error', (err) => {
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| 9 | if (err.code === 'EADDRINUSE' || err.code === 'EACCES') {
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| 10 | server.listen(0, host)
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| 11 | } else {
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| 12 | reject(err)
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| 13 | }
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| 14 | })
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| 15 | server.on('listening', () => {
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| 16 | const { port } = server.address()
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| 17 | server.close(() => resolve(port))
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| 18 | })
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| 19 | server.listen(port, host)
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| 20 | })
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| 21 | }
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| 22 |
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| 23 | module.exports = getPort
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