类型子元素缺少 Nextjs + React Context 和 TypeScript 的属性

Question

Using Reacts Context with Nextjs and TypeScript is showing a vague error wrapping context around the _app.tsx .

Event though I am passing in the values to the Context Provider it's giving me the error:

"Type '{ children: Element; }' is missing the following properties from type 'ContextProps': capturedPokemons, catchPokemon, releasePokemon"

Here is my _app.tsx

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <CaughtProvider>
      <Component {...pageProps} />
    </CaughtProvider>
  );
}

Here is the Context:

type PokemonProps = {
  number: string;
  name: string;
  image: string;
};

type ContextProps = {
  capturedPokemons: PokemonProps[];
  catchPokemon: (newPokemon: PokemonProps[]) => void;
  releasePokemon: (id: string) => void;
};

const CaughtContext = createContext<ContextProps>({
  capturedPokemons: [],
  catchPokemon: () => undefined,
  releasePokemon: () => undefined,
});

export const useCaught = () => useContext(CaughtContext);

export const CaughtProvider: React.FC<ContextProps> = ({ children }) => {
  const [capturedPokemons, setCapturedPokemons] = useState<any>([]);

  const catchPokemon = (newPokemon: PokemonProps[]) => {
    if (capturedPokemons.length >= 6) {
      alert('You cannot carry any more Pokemon.');
      return;
    }

    const alreadyCaptured = capturedPokemons.some(
      (p: PokemonProps) => p.name === newPokemon[0].name
    );

    if (alreadyCaptured) {
      alert('you already have that pokemon');
      return;
    }

    if (window.confirm('Capture Pokemon')) {
      setCapturedPokemons([...capturedPokemons, ...newPokemon]);
    }
  };

  return (
    <CaughtContext.Provider
      value={{ catchPokemon, capturedPokemons, releasePokemon }}>
      {children}
    </CaughtContext.Provider>
  );
};

The app works fine as expected and as I'm aware this is how it's done in plain React/JS without TypeScript.

Answer 1

You need to have a separate type for the CaughtProvider

type CaughtProviderProps = {
children: React.ReactNode
}

and use it as

CaughtProvider: React.FC<CaughtProviderProps>

ContextProps is for your context value so its not right to use it for CaughtProvider . CaughtProvider is just a component which takes the children prop. So its better to have a separate type for it.