const edger = window.edger;

// The init method must be called as earlier as possiable.
edger.lifecycle.init();

function isImportantResourceError(e) {
  // Failed to load resources that affect functionality.
  ...
}

// If some key resources loaded fail, the API can be called to reload the app.
window.addEventListener('error', (e) => {
  if (isImportantResourceError(e)) {
    edger.lifecycle.reload();
  }
})

function firstScreenReady() {
  ...
}

window.addEventListener('load', (e) => {
  if (firstScreenReady()) {
    edger.lifecycle.ready();
  }
})