Derive a data type from a parameter passed to a function defined within an interface

I am working with a function defined in an interface as shown below:

interface UseAutocompleteReturnValue {
...
getRootProps: (externalProps?: any) => React.HTMLAttributes<HTMLDivElement>;
}

Within my interface, I aim to create a prop named rootProp which will depend on the type of the parameter externalProps in getRootProps. Therefore, the type in this case will be:

rootProps?: any

Is there a method for achieving this?

Answer №1

To retrieve parameters from a specific function, you can utilize the built-in type Parameters<T>:

type FetchParams = Parameters<UseAutocompleteReturnValue['fetchData']>;

After defining this, FetchParams will be of type [any?]. If you need to access the first parameter, simply use [0]:

type FirstParam = Parameters<UseAutocompleteReturnValue['fetchData']>[0];

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