JS identifier related helpers

[lasjorg]

Should we add some identifier related helpers?

It might be nice to have identifier matcher and validator helpers. Not sure how often they are needed.

E.g.

https://github.com/sindresorhus/identifier-regex

https://github.com/sindresorhus/is-identifier

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BTW, I was looking at getFunctionParams and it is matching on \w+ which would include invalid identifiers. Not sure if it really matters, probably not.

getFunctionParams("function test(42) {}");
getFunctionParams("function test(case) {}");