Seconds elapsed using pubsub.js and state.js

seconds-elapsed.js

const appEvents = pubSub();
const appState = state(0, appEvents);

function timer() {
  appState.setValue(appState.getValue() + 1);
  setTimeout(timer, 1000);
}
setTimeout(timer, 1000);

function updateTimerView(val) {
  document.querySelector(".seconds-elapsed").innerText = `seconds elapsed ${val}`;
}

appEvents.subscribe(updateTimerView);