Typescript declaration merging to expand or override module type or interface property
This might not be the solution you're looking for but I usually have a custom interface for location (maybe export it from a shared .ts file on your app), then use useLocation hook with that interface.
import React, { ReactElement } from "react";import { useLocation } from "react-router-dom";interface CustomLocationState { A: string; B: string;}export default ():ReactElement => { const { state: {A, B} } = useLocation<CustomLocationState>(); return <div>{A} - {B}</div>}