signal-desktop/js/expire.js

(function() {
  'use strict';
  var BUILD_EXPIRATION = 0;
  try {
    BUILD_EXPIRATION = parseInt(window.getExpiration());
    if (BUILD_EXPIRATION) {
      console.log('Build expires: ', new Date(BUILD_EXPIRATION).toISOString());
    }
  } catch (e) {}

  window.extension = window.extension || {};

  extension.expired = function() {
    return BUILD_EXPIRATION && Date.now() > BUILD_EXPIRATION;
  };
})();