"const input$ = sources.DOM.select('.field').events('input')"

Is there a switchMap in here?

What happens if the input element is removed/inserted back into the DOM?

"input('.field', {attrs: {type: 'text'}}),"

It's possible right now for the value in this input to differ from the value in input$.

Maybe use a combineLatest and then this?

"input('.field', {attrs: {type: 'text', value: inputVal}}),"