Remove obsolete jshint options #2409
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josephsavona
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May 15, 2024
Improves memoization for cases such as #2409: ```javascript const x = []; useEffect(...); return <div>{x.map(item => <span>{item}</span>)}</div>; ``` We previously thought that the `x.map(...)` call mutated `x` since its kind was Mutable. However, in this case we can determine that the map call cannot mutate `x` (or anything else): the lambda does not mutate any free variables and does not mutate its arguments. This PR adds a new flag to function signatures, used for method calls only, that checks for such cases. The idea is that if the receiver is the only thing that is mutable — including that there are no args which are function expressions which mutate their parameters — then we can infer the effect as a read. See tests which confirm that function expressions which capture or mutate their params bypass the optimization.
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This options are obsolete in JSHint 2.5.0 release
"onecase":"regexdash":"trailing":Lint checker with options:
Lint checker without options:
