Where do you suggest that keyboard constants be added to the Javascript language?

I saw this code here:

myCombobox.addEventListener('keydown', function(event) {
  if (event.key === 'Escape') {
    myCombobox.close();
    event.stopPropagation();
  }
});

My education and experience tells me that the code should be comparing a constant.

myCombobox.addEventListener(MouseEvents.KEYDOWN, function(event) {
  if (event.key === KeyboardConstants.ESCAPE) {
    myCombobox.close();
    event.stopPropagation();
  }
});

Is there a class or object in JavaScript that has a list of all the keys and keyboard events on it?

Other languages do this for very obvious specific reasons, to prevent typos, which prevent errors and non-functioning code.

Does Javascript love errors or do these classes exist and I couldn’t find them?

I tried to suggest this to TC39 and they said it’s not a language feature. Where do I suggest this feature?