chromereload.js

'use strict';

// Reload client for Chrome Apps & Extensions.
// The reload client has a compatibility with livereload.
// WARNING: only supports reload command.
<% if (babel) { %>
const LIVERELOAD_HOST = 'localhost:';
const LIVERELOAD_PORT = 35729;
const connection = new WebSocket('ws://' + LIVERELOAD_HOST + LIVERELOAD_PORT + '/livereload');

var lastReload = false;

chrome.runtime.onInstalled.addListener(function(details) {
  lastReload = Date.now();
});    

connection.onerror = error => {
  console.log('reload connection got error:', error);
};

connection.onmessage = e => {
  if (e.data) {
    const data = JSON.parse(e.data);
    if (data && data.command === 'reload') {
      var currentTime = Date.now();
      if (lastReload && currentTime - lastReload > 60000) {
	      // don't reload more than once a minute
	      chrome.runtime.reload();
	      chrome.developerPrivate.reload(chrome.runtime.id, 
				       {failQuietly: true});
      }
    }
  }
};
<% } else { %>
var LIVERELOAD_HOST = 'localhost:';
var LIVERELOAD_PORT = 35729;
var connection = new WebSocket('ws://' + LIVERELOAD_HOST + LIVERELOAD_PORT + '/livereload');

var lastReload = false;

chrome.runtime.onInstalled.addListener(function(details) {
  lastReload = Date.now();
});    

connection.onerror = function (error) {
  console.log('reload connection got error:', error);
};

connection.onmessage = function (e) {
  if (e.data) {
    var data = JSON.parse(e.data);
    if (data && data.command === 'reload') {
      if (lastReload && currentTime - lastReload > 60000) {
	// don't reload more than once a minute
	chrome.runtime.reload();
	chrome.developerPrivate.reload(chrome.runtime.id, 
				       {failQuietly: true});
      }
    }
  }
};
<% } %>