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can be negated by grouping them and applying the ! operator, i.e.
!(ainobj);!(ainstanceofC);
Applying the ! operator incorrectly (on the LHS operand) leads to bugs:
!ainobj;// will evaluate to false, unless obj has a "true" or "false" key!ainstanceofC;// will evaluate to false, unless C overrides instanceof with a @@hasInstance method
in
andinstanceof
expressions in JScan be negated by grouping them and applying the
!
operator, i.e.Applying the
!
operator incorrectly (on the LHS operand) leads to bugs:For more information, please see these MDN docs and the no-unsafe-negation recommended Eslint rule.
I have found a potentially problematic instance of the above bugs in your codebase:
flow/packages/flow-parser/test/esprima_test_runner.js
Line 449 in 8eb1dd8
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