What characters are valid for JavaScript variable names?

Question

Which characters can be used for naming a JavaScript variable?

I want to create a small \"extension library\" for my non-JavaScript users here at work (who all seem

Answer 1

Wrote a glitch workspace that iterates over all the codepoints and emit the character if eval('var ' + String.fromCodePoint(#) + ' = 1') works.

It just keeps going, and going, and going....