script_tag_plugins.js

const script = document.createElement("script")

script.type = 'application/javascript'

script.src = 'https://geolytix.github.com/GEOLYTIX/public/blob/v3/public/myPluginScript.js'

let eventTriggered

script.onload = () => {
  setTimeout(()=>{
    !eventTriggered && console.error('Event not triggered')
    document.removeEventListener('myPluginScript', eF, true)
    script.remove()
    resolve() // resolve promise to load script
  }, 400)
}

script.onerror = () => {
  document.removeEventListener('myPluginScript', eF, true)
  script.remove()
  reject() // reject promise to load script
}

document.addEventListener('myPluginScript', eF, true)
document.head.append(script)

function eF(e){
  eventTriggered = true
  e.detail(_xyz)
}