What is the most effective method for incorporating type assertion into destructuring assignment?

I've utilized destructuring assignment in my code with the following syntax:

const { values: project, setValues, submitForm } = useFormikContext();

After reading through the TypeScript type assertion documentation, I want to explicitly specify that project will always be of type Project using the as keyword. Can someone provide me with the correct syntax for this? I've attempted:

const { values: (project as Project), setValues, submitForm } = useFormikContext();

but it appears to be invalid.

typescriptformikdestructuringtype-assertionobject-destructuring

Answer №1

To tackle this issue, you can utilize the given syntax:

const { data: information, setData, submitForm }: { data: Information; setData: DataType1, submitForm: DataType2} = useFormikContext();

Furthermore, you have the option to define an additional variable:

const { data: information, setData, submitForm } = useFormikContext();
const b: Information = information;

Answer №2

After examining the code in FormikContext.tsx, it becomes apparent that TypeScript Generics are utilized in the definition.

export function useFormikContext<Values>() {
  const formik = React.useContext<FormikContextType<Values>>(FormikContext);

  return formik;
}

This creates a React context, and when calling the hook with:

useFormikContext<Project>()

Possibly, not only will the values be of type Project, but also setValues would only accept objects of type Project (though I have not personally used the library).

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