useRef.ts

import { OtherComponent } from "./other-component";
import React, { useRef, ElementRef } from "react";

// Pass it in via typeof!
type OtherComponentRef = ElementRef<typeof OtherComponent>;

const Component = () => {
  const ref = useRef<OtherComponentRef>(null);
  return <OtherComponent ref={ref}>Hello</OtherComponent>;
};