javascript - 使用 React.forwardRef 时在 React/TypeScript 中给 ref 什么类型？

Question

我无法正确输入。如果我设置 ref: any，我将转发一个可以正常工作的 ref如下图和ref.current.focus()有效。

function EditorFeat(): JSX.Element {
  const ref = useRef<HTMLElement | null>(null);

   // ...
   return (
    ......
    <Editor state={state} dispatch={dispatch} ref={ref} />
     ....
)
}

export default EditorFeat;

interface IEditor {
  state: AppState;
  dispatch: React.Dispatch<Action>;
}

// change ref:any to correct typings!
function Editor({ state, dispatch }: IEditor, ref: any): JSX.Element {
// ...
  return <DraftJsEditor ref={ref} /> // import from 'draft-js'
}

export default React.forwardRef(Editor);

但一旦我尝试获取 ref正确输入，我总是收到错误!

如果我这样做 function Editor({state, dispatch}: IEditor, ref: HTMLElement): JSX.Element

我得到下一个错误:

  Overload 1 of 2, '(props: Readonly<DraftEditorProps>): DraftEditor', gave the following error.
    Type 'HTMLElement' is not assignable to type 'string | ((instance: DraftEditor | null) => void) | RefObject<DraftEditor> | null | undefined'.
      Type 'HTMLElement' is not assignable to type 'string'.
  Overload 2 of 2, '(props: DraftEditorProps, context?: any): DraftEditor', gave the following error.
    Type 'HTMLElement' is not assignable to type 'string | ((instance: DraftEditor | null) => void) | RefObject<DraftEditor> | null | undefined'.
      Type 'HTMLElement' is not assignable to type 'string'

如果我尝试 React.RefObject<DraftEditor>我得到:

Argument of type '({ state, dispatch }: IEditor, ref: RefObject<DraftEditor>) => Element' is not assignable to parameter of type 'ForwardRefRenderFunction<DraftEditor, IEditor>'.
  Types of parameters 'ref' and 'ref' are incompatible.
    Type '((instance: DraftEditor | null) => void) | MutableRefObject<DraftEditor | null> | null' is not assignable to type 'RefObject<DraftEditor>'.
      Type 'null' is not assignable to type 'RefObject<DraftEditor>'

Answer 1

对于功能组件，这就像一个魅力，即使有点不寻常:

function RichEditor(props: RichEditorProps) {
  const [editor, setEditor] = React.useState<Editor | null>(null);

  React.useEffect(() => {
    editor?.focus() // or anywhere you want to use it
  }, [editor])
    

  return (
    <Editor
      ref={editor => setEditor(editor)}
    />
  )
}