反应:期望一个赋值或函数调用，而是看到一个表达式 [英] React: Expected an assignment or function call and instead saw an expression

问题描述

我正在尝试在下面的示例代码中的const def = (props) => {行修复此皮棉错误.

I am trying to fix this lint error at line const def = (props) => { in following sample code.

const propTypes = {
prop1: PropTypes.string,
prop2: PropTypes.string,
prop3: PropTypes.string,
prop4: PropTypes.string,
prop5: PropTypes.string,
}

const abc = (props) => {
some code here }

const def = (props) => {
<div>
<div className=" ..some classes..">{abc}</div>
<div className=" ..some classes..">{t('translation/something')}</div>

<div ...>
  <someComponent 
    do something
  />

if (some condition) {
do this
} else {
do that
}

</div>

};

有人知道为什么我会出现此皮棉错误吗?

Any idea why i am getting this lint error?

推荐答案

您至少从代码段和评论中都不会​​返回任何内容.

You are not returning anything, at least from your snippet and comment.

const def = (props) => { <div></div> };

这不返回任何内容，您用花括号将arrow函数的主体包裹起来，但是没有返回值.

This is not returning anything, you are wrapping the body of the arrow function with curly braces but there is no return value.

const def = (props) => { return (<div></div>); };或 const def = (props) => <div></div>;

另一方面，这两个解决方案正在返回有效的React组件.还要记住，在jsx内(如@Adam所述)，您不能具有if ... else ...，而只能具有三元运算符.

These two solutions on the other hand are returning a valid React component. Keep also in mind that inside your jsx (as mentioned by @Adam) you can't have if ... else ... but only ternary operators.

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