12 lines
344 B
JavaScript
12 lines
344 B
JavaScript
const net = require('net')
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module.exports = (port, host = '127.0.0.1') => new Promise((resolve, reject) => {
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const tester = net.createServer()
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.once('error', err => (err.code === 'EADDRINUSE' ? resolve(false) : reject(err)))
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.once('listening', () => tester.once('close', () => resolve(true)).close())
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.listen({
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host,
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port
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})
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})
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