JavaScript: Introduce new query UnclearOperatorPrecedence
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#260
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When using bitwise operators, it's easy to write code like
x & 4 !== 0
without realising that this is interpreted asx & (4 !== 0)
and not(x & 4) !== 0
. My favourite example of this comes from an old version of Angular.js, but other examples abound.The second commit adds a query for flagging such nestings between bitwise operators and relational operators, which reuses some logic from the whitespace-contradicts-precedence query pulled out in the first commit. I improved that query to take advantage of per-token location while I was at it.
Performance looks fine (it's of course an entirely syntactic query), and there are many decent results. I've made it a recommendation since smart people use this sort of idiom on purpose.