wait for rcs service to be loaded

custom_customer_js_file.js

function initCustomTinyMCEStuff (tinyMCE) {
  console.log('here is where you would run your callback that does custom tinyMCE stuff. in the case of your minified code, it is the function called "r"', tinyMCE)
}

//this will keep checking for the rceModule to be ready and call your
// callback that does all of your customizations once it is.
var waitForRCSServiceToBeReadyPollInterval = setInterval(function(){
  if (typeof RceModule === 'undefined') return
  initCustomTinyMCEStuff(tinyRCE)
  clearTimeout(waitForRCSServiceToBeReadyPollInterval);
}, 500)