函数上缺少返回类型-在React（TypeScript）代码中 [英] Missing return type on function - in react (typescript) code

问题描述

在我的App.tsx中我得到了这个信息：

In my App.tsx i got this:

• 在function.eslint（@ typescript-eslint / explicit-function上缺少返回类型-return-type）

在我的主要课程组件中，我得到了这些内容：

And in my main class component i got these:

• 方法定义render.eslint（@ typescript-eslint / explicit-member-accessibility）上缺少可访问性修饰符


• 在function.eslint上缺少返回类型@ typescript-eslint / explicit-function-return-type）

我正在使用带有TypeScript的React。
对于短绒毛衫，我使用ESLint进行代码格式化。

I'm using React with TypeScript. For linter I use ESLint and for code formating Prettier.

我找到了以下信息： https://github.com/typescript-eslint /typescript-eslint/blob/v1.6.0/packages/eslint-plugin/docs/rules/explicit-function-return-type.md ，但我不知道如何以及在何处使用它。

I found this info: https://github.com/typescript-eslint/typescript-eslint/blob/v1.6.0/packages/eslint-plugin/docs/rules/explicit-function-return-type.md , but I don't know how and where to apply it.

App.tsc

class Main extends Component {
    render() {
        return (
            <Router>
                <div>
                    <Link to="/">Home</Link>
                    <br />
                    <Link to="/component1">Component1</Link>
                    <br />
                    <Link to="/component2">Component2</Link>

                    <Route exact path="/" render={() => <h1>Home Page</h1>} />
                    <Route path="/component1" component={Component1} />
                    <Route path="/component2" component={Component2} />
                </div>
            </Router>
        );
    }
}

Component1.tsc

Component1.tsc

interface Props {
    number: number;
    onNumberUp: any;
    onNumberDown: any;
}

const Component1 = (props: Props): JSX.Element => {
    return (
        <div>
            <h1>Component1 content</h1>
            <p>Number: {props.number}</p>
            <button onClick={props.onNumberDown}>-</button>
            <button onClick={props.onNumberUp}>+</button>
        </div>
    );
};

const mapStateToProps = (state: any) => {
    return {
        number: state.firstReducer.number,
    };
};

const mapDispachToProps = (dispach: any) => {
    return {
        onNumberUp: () => dispach({ type: 'NUMBER_UP' }),
        onNumberDown: () => dispach({ type: 'NUMBER_DOWN' }),
    };
};

减速器和动作位于单独的文件夹中。

Reducer and actions are in separate folders.

Component1和Component2相似。

Component1 and Component2 are similar.

有人知道如何解决此错误吗？

Does someone knows how to fix this error?

推荐答案

Missing accessibility modifier on method definition render.eslint(@typescript-eslint/explicit-member-accessibility)

可访问性修饰符是公共/私有/受保护的。对于渲染，这应该是公共的。

Accessibility modifiers are things like public/private/protected. For render, this should be public.

因此，将public一词添加到render（）：

So add the word public to render():

class Main extends Component {
    public render() {
        ...
    }
}


Missing return type on function.eslint(@typescript-eslint/explicit-function-return-type)

您不应该在这里遇到该错误。这是告诉您添加一个返回类型以进行渲染，但是由于您已经扩展了React.Component，它应该能够从类型定义中加载该类型。

You shouldn't have that error here. This is telling you to add a return type to render, but since you've extended React.Component it should be able to load the type from the type definitions.

具有您添加了@ types / react& @ types / react-dom到您的项目？

Have you added @types/react & @types/react-dom to your project?

如果没有，则 npm i -D @ types / react @ types / react-dom

看起来您还需要 @ types / redux 作为您的redux代码：（ npm i -D @ types / redux ）
从 redux导入{Dispatch}；

Also looks like you need @types/redux for your redux code: (npm i -D @types/redux) import { Dispatch } from 'redux';

const mapDispatchToProps = (dispatch: Dispatch<any>) => {
    return {
        onNumberUp: () => dispatch({ type: 'NUMBER_UP' }),
        onNumberDown: () => dispatch({ type: 'NUMBER_DOWN' }),
    };
};

最后的注释-我不喜欢ESLint中的公共/私有访问者规则。我只是禁用它。更多信息在这里（第1点）： https://medium.com/@martin_hotell/10-typescript-pro-tips-patterns-with-or-without-react-react-5799488d6680

Final note - I'm not a fan of the public/private accessor rule in ESLint. I would just disable it. More info here (point 1): https://medium.com/@martin_hotell/10-typescript-pro-tips-patterns-with-or-without-react-5799488d6680

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