fix TypeError: Cannot read properties of null (reading 'parent') within isInCustomHookDef

[peterpme]

Hello! I've discovered an issue with eslint-plugin-valtio in the following scenario:

type MyValue = any;
function MyFunction() {
  const id = useSnapshot(store) // normal usage of valtio snapshot
  const [value, setValue] = useState({});
  
  useQuery({
    queryKey: ['test'],
    queryFn: () => {
      setValue(prev) => {
        return {
          ...prevent,
          [id]: value as MyValue //breaks on this line
        }
      }
    },
  });
  
}

The error I'm receiving is:

TypeError: Cannot read properties of null (reading 'parent')
Occurred while linting MyComponent.tsx:91
Rule: "valtio/state-snapshot-rule"
    at isInCustomHookDef (MyProject/node_modules/eslint-plugin-valtio/index.js:238:60)
    at Identifier (MyProject/node_modules/eslint-plugin-valtio/index.js:346:92)

By checking if these nodes exist, I'm able to fix the issue. Thanks!

[barelyhuman]

Don’t have my laptop so this is based off what i could read on the phone screen.

1. instead of returning false, we’d like to add a check for if it’s in a function inside an object inside a custom hook

reasoning is that we might have further cases that might come up in the future and the plugin would return false for everything

if that makes sense, please make the changes accordingly if not, i’ll pick this up once i have fixed my work machine 😅