Now request interfaces like DistanceMatrixRequest, GeocodeRequest extends AxiosRequestConfig which has params (type: any).

In my case I just want to omit key from request params because we set key globally, so I defined following interface.

interface IKeyOmittedGeocodeRequest extends Omit<GeocodeRequest, 'params'> {
  params: Omit<Pick<GeocodeRequest, 'params'>, 'key'>;
}

But as GeocodeRequest extends AxiosRequestConfig which has params, TypeScript recognizes params in IKeyOmittedGoecodeRequest from AxiosRequestConfig which is any.
And it doesn't recognize request.params.destinations.