在其他组件中使用 forwardRef 出现类型错误

Question

I got this error:

Type 'ForwardedRef<unknown>' is not assignable to type 'LegacyRef<HTMLDivElement>'

import React from "react";

const Other = React.forwardRef((props, ref) => {
  return (
    <div ref={ref}>
      <h1>Other</h1>
    </div>
  );
});

export default Other;

Is this the right usage?

Demo: https://codesandbox.io/s/summer-shadow-5ul13e?file=/src/Other.tsx:0-172

Answer 1

Simply make sure to provide type arguments to forwardRef , as shown for example here :

import React from "react";

const Other = React.forwardRef<HTMLDivElement, unknown>((props, ref) => {
  return (
    <div ref={ref}>{/* Okay */}
      <h1>Other</h1>
    </div>
  );
});

Playground Link

Answer 2

Initialise useRef with null initially and type <HTMLDivElement> . Also, apply type <HTMLDivElement> to forwardRef as well. Check on mount if ref is assigned correctly.

Here is the Sandbox Link