Maybes with one null check

maybes.js

// type alias DOM = Object // unknown structure, defined by Cheerio
// type alias Selector = String // like a jquery selector (e.g., '#omg') 

// selectAll :: Selector -> DOM -> List DOM
const selectAll = R.curry((sel, dom) => {
  const res = dom(sel);
  return R.map(cheerio, res.toArray());
});

// selectFirst :: Selector -> DOM -> Maybe DOM
const selectFirst = R.curry((sel, dom) =>
  R.pipe(selectAll(sel), R.head, S.toMaybe)(dom)
);

selectFirst('.product', productsDom) // returns a Maybe DOM
  .map(text) // if the DOM is there it gets the text otherwise it's a noop
  .map(processText) // if the DOM was there we can process the text however we want

/********** Imperative equivalent **************/

// selectFirst :: Selector -> DOM -> Maybe DOM
const selectFirst = R.curry((sel, dom) =>
  R.pipe(selectAll(sel), R.head)(dom)
);

var product = selectFirst('.product', productsDom);

if (product) {
  processText(text(product));
}