t7n-localhost/index.js

get your 'loalhost'

const os = require('os')

const info = {
  get localhost() {
    let localhost
    try {
      var network = os.networkInterfaces()
      var networkKeys = Object.keys(network)
      var networkKey = ''
      var networkKeyIndex = 0
      var isEnStart = false
      var targetKey
      do {
        networkKey = networkKeys[networkKeyIndex]
        isEnStart = /^en\d/.test(networkKey)
        if (isEnStart) targetKey = networkKey
        networkKeyIndex++
      } while (networkKeyIndex < networkKeys.length && !isEnStart)
      localhost = network[targetKey][1].address
    } catch (e) {
      localhost = 'localhost';
    }
    return localhost
  }
}

module.exports = info.localhost