lib/deployer.js
function _updatePjson(siteId) {
  pjson.vapid.site = siteId;
  writePkg.sync(pjsonPath, pjson);
}
function _updatePjson(siteId) {
  pjson.vapid.site = siteId;
  writePkg.sync(pjsonPath, pjson);
}
function _updatePjson ( siteId ) { pjson . vapid . site = siteId ; writePkg . sync ( pjsonPath , pjson ) ; }
Save the site UUID into package.json

@param {string} siteId
Save the site UUID into package . json