Here would be things I would list specific to front-end. Obviously these are just my opinion
Plateau (not fading but not maybe peaked):
I know some will take issue with my trending down on Angular. I don't think it is going away by any means - lots of large enterprises especially rely on it - and it remains a huge community. But I do think we people are being drawn away by frameworks like Vue, that brought along an audience that wasn't comfortable with the idea of switching to React.
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