Oxygenados Com

                  function removeTransition(e){
    if(e.propertyName !== 'transform') return //Si no transform anula
    this.classList.remove('la-clase')
}

const keys = document.querySelectorAll('.key')
keys.forEach(key => key.addEventListener('transitionend', removeTransition))

/***  Referencia ***/
//https://courses.wesbos.com/account/access/65b79e1fc78021d87dae1fa2/view/194130650
//Pieces https://juanjota.pieces.cloud/?p=7b4944918f
//Archivos --> https://github.com/wesbos/JavaScript30