// setup plv8 connection
const PLV8 = require('plv8')
const plv8 = new PLV8({
  client: 'pg',
  connection: {
    // knex.js connection object
  }
})

// setup a log listener
plv8.on('log:error', msg => {
  console.error(msg)
})

// setup a listener
plv8.on('user:updated', user => {
  // do some stuff with the "user" object
})

// install the lodash module so that it can be loaded (via require()) later
plv8.install(require.resolve('lodash'))
  .then(() => {

    // eval some code
    return plv8.eval(() => {
      const _ = require('lodash')
      return _.map([ 1, 2, 3 ], e => e + 1)
    })
  })
  .then(result => {
    // result = [ 2, 3, 4 ]
  })

// send some events to the client 
plv8.eval(() => {
  const _ = require('lodash')
  const veryImportantValue = _.map([ 1, 2, 3 ], e => e + 1)

  // maybe I want to send this event to the client, but continue doing more things
  plv8.emit('user:updated', {
    username: 'tjwebb',
    email: '[email protected]'
  })

  try {
    return veryImportantValue + 1
  }
  catch (e) {
    plv8.log('error', e)
    return 0
  }
})