1 | 'use strict';
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2 | const net = require('net');
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3 |
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4 | const getPort = options => new Promise((resolve, reject) => {
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5 |
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6 |
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7 | if (typeof options === 'number') {
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8 | options = {
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9 | port: options
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10 | };
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11 | }
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12 |
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13 | const server = net.createServer();
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14 |
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15 | server.unref();
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16 | server.on('error', reject);
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17 |
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18 | server.listen(options, () => {
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19 | const port = server.address().port;
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20 | server.close(() => {
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21 | resolve(port);
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22 | });
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23 | });
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24 | });
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25 |
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26 | module.exports = options => options ?
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27 | getPort(options).catch(() => getPort(0)) :
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28 | getPort(0);
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