Error: Type 'void' is not assignable to type 'ReactNode'

Question

我试图在调用该函数时遇到错误，这只是为了练习，所以我将所有内容都保存在 App.tsx 中。我的 class 看起来像这样：

enum Actor {
  None = '',
}

const initializeCard = () => {
  //some logic here
  return card;
}

export default class App extends Component<{}, State> {
  state: State ={
    card: initializeCard()
  }

  public renderRows = () => {
    const { card } = this.state;
    board.map((actor, index) => this.renderRow(actor, index));
  }

  public renderRow = (actor: Actor, index: number) => {
    return(
      <div className="cell">

      </div>
    )
  }

  public render() {
    return (
      <div className="App">
        <div>
            { this.renderRows() } // Here I'm getting the error
        </div>
      </div>
    )
  }
}

我的Package.json看起来像：

"dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "@types/jest": "^24.0.0",
    "@types/node": "^12.0.0",
    "@types/react": "^16.9.0",
    "@types/react-dom": "^16.9.0",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-scripts": "3.4.1",
    "typescript": "~3.7.2"
  }

完整错误如下：

Type 'void' is not assignable to type 'ReactNode'.ts(2322) index.d.ts(1348, 9): The expected type comes from property 'children' which is declared here on type 'DetailedHTMLProps, HTMLDivElement>'

我搜索了此错误的解决方案并找到了，但我无法使用此解决方案解决我的问题。请让我知道我该如何解决这个问题。谢谢

Answer 1

确保 renderRows 函数 returns 它呈现的行，而不是只呈现它们而不做任何事情。

enum Actor {
  None = '',
}

const initializeCard = () => {
  //some logic here
  return card;
}

export default class App extends Component<{}, State> {
  state: State ={
    card: initializeCard()
  }

  public renderRows = () => {
    const { card } = this.state;
    return board.map((actor, index) => this.renderRow(actor, index));
  }

  public renderRow = (actor: Actor, index: number) => {
    return(
      <div className="cell">

      </div>
    )
  }

  public render() {
    return (
      <div className="App">
        <div>
            { this.renderRows() } // Here I'm getting the error
        </div>
      </div>
    )
  }
}

Answer 2

您需要 return 您的函数中的某些内容。

renderCell函数在哪里？也许你的意思是 renderRow?

Error: Type 'void' is not assignable to type 'ReactNode'

Error: Type 'void' is not assignable to type 'ReactNode'

javascript

typescript

reactjs

react-tsx

typescript3.0