ComponentProps.tsx

import { ComponentProps } from "react";
import { ExternalComponent } from "external-lib";

type InternalComponentProps = ComponentProps<typeof ExternalComponent> & {
  outerClassName: string;
};

const InternalComponent = ({
  outerClassName,
  ...restProps
}: InternalComponentProps) => (
  <div className={outerClassName}>
    <ExternalComponent {...restProps} />
  </div>
);