presta/lib/liveReloadScript.ts

export function createLiveReloadScript({ port }: { port: number }) {
  return `
    <script>
      (function (global) {
        try {
          const socketio = document.createElement('script')
          socketio.src = 'https://unpkg.com/pocket.io@0.1.4/min.js'
          socketio.onload = function init () {
            var disconnected = false
            var socket = io('http://localhost:${port}', {
              reconnectionAttempts: 3
            })
            socket.on('connect', function() { console.log('presta connected on port ${port}') })
            socket.on('refresh', function() {
              global.location.reload()
            })
            socket.on('disconnect', function() {
              disconnected = true
            })
            socket.on('reconnect_failed', function(e) {
              if (disconnected) return
              console.error("presta - connection to server on :${port} failed")
            })
          }
          document.head.appendChild(socketio)
        } catch (e) {}
      })(this);
    </script>
  `
}