Creating a type definition for the createSelector function based on the useQuery result

Struggling to find the correct typings for the createSelector res parameter from redux-js, especially in TypeScript where there are no examples or explanations available. The only guidance is provided in JS.

const selectFacts = React.useMemo(() => {
    return createSelector(
        (res) => res.data,
        (data) => (data ? pick(data, facts_keys) : undefined)
    );
}, []);

const { facts } = useGetProfileQuery(user?.email ?? skipToken, {
    selectFromResult: (result) => ({
        ...result,
        facts: selectFacts(result),
    }),
});

Referenced here: https://redux.js.org/tutorials/essentials/part-8-rtk-query-advanced#selecting-values-from-results

If anyone has encountered a similar issue of unclear typing in TypeScript, please share your experience.

I resorted to type assertion as a temporary solution to avoid type definition errors, but this is not an ideal approach. Open to any alternative suggestions.

javascripttypescriptreduxreact-reduxrtk-query

Answer №1

No need to worry about the intricate details of something like this. Just focus on what you actually require.

Your current selector simply deals with data, and elsewhere in your application, you have already set up an interface for that purpose.

Therefore, you can simplify it by using:

const selectFacts = React.useMemo(() => { 
  return createSelector(
    (res: { data: YourDataInterfaceOrType }) => res.data, 
    (data) => (data ? pick(data, facts_keys) : undefined) 
  ); 
}, []);

Answer №2

I encountered a similar issue and found a solution for selecting the types using the following method (I customized my code based on your example):

return createSelector(
        [(result: UseQueryStateResult<any, any>) => result.data],
        (data : Profile) => data ? pick(data, facts_keys) : undefined
)

Nevertheless, I am uncertain if it is accurate.

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