How many ES5 environments are still in use today?

[/#!/JoePea]

I'm curious to know how many pure ES% environments (with or without
non-standard features like __proto__, and without any ES6 features) are
still being used in the wild.

Would this come down to a browser statistics lookup? I believe there are
other projects that use ES, like Rhino, Espruino, etc. Do you know of some
place to get such statistics besides for browsers?

*/#!/*JoePea
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