Intercept & release / remove all event listeners. Partially as an easy way to make Mithril router single-SPA compliant.

eventListenerListener.js

const {addEventListener} = EventTarget.prototype

export default function EventListenerListener({
    blocking = false, 
    removing = true, 
    visitor  = Function.prototype,
  } = {}){
  if(this instanceof EventListenerListener){}
  else return new EventListenerListener(...arguments)
  
  let capturing = false
  let listeners = []
  
  this.capture = () => {
    if(capturing)
      console.warn('Already capturing')
    
    else {
      capturing = true
      
      visitor(this, arguments)
      
      EventTarget.prototype.addEventListener = function(){
        if(!blocking)
          addEventListener.apply(this, arguments)

        listeners.push([this, arguments])
      }
    }
    
    return this
  }
  
  this.release = () => {
    if(!capturing)
      console.warn('Not capturing')
    
    
    const captured = listeners.map(x => ({
      this     : x[0],
      arguments: x[1],
    }))
    
    capturing = false
    listeners = []
    
    return captured
  }
}