static analysis - Usage before assignment detection in a Javascript code -

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i'm taking on task find issues in large number of short javascript codes. 1 of things i'm looking instance of variable usage before explicit assignment, so:

var a; var b = + 10; // not explicitly assigned value

i've tried few js analysis tools jslint don't catch it. i'm hoping ready use tool, i'm pressed time, if there's library can used bit of coding, that's helpful.


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