Trending Developer Skills, Based on my Analysis of “Ask HN: Who’s Hiring?”
Ryan Williams

You can't really say that these skills are "Trending" - they're more like "Wanted", wherein there are unfilled vacancies.

Considering that this data comes from a hiring job board, the real conclusion is the React (Currently #1) actually has the most demand and least supply.

This cannot conclude that React is more popular or is as "Trendy" as Angular, as the Angular positions may all be filled easier (equivalent supply and demand).