test.js

let isRunning = false
const foo = function() {
  isRunning = true
  console.log('called')
  isRunning = false
}

const events = ['click', 'mousedown']

let func = function(eventsArr, cb) {
  eventsArr.forEach(eventName => {
    document.addEventListener(eventname, (e) => {
      if (!isRunning) {
        cb()
      }
    })
  })
}