in and instanceof expressions in JS
a in obj;
a instanceof C;
can be negated by grouping them and applying the ! operator, i.e.
!(a in obj);
!(a instanceof C);
Applying the ! operator incorrectly (on the LHS operand) leads to bugs:
!a in obj; // will evaluate to false, unless obj has a "true" or "false" key
!a instanceof C; // will evaluate to false, unless C overrides instanceof with a @@hasInstance method
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:
|
if (!'onhashchange' in W) { |
inandinstanceofexpressions 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:
microservices-platform/zlt-web/layui-web/src/main/resources/static/assets/libs/q.js
Line 38 in da821d6