英文:
Why ESLint trigger error on useEffect dependancy array
问题
我在VS Code中安装了ESLint，在我的React项目中，当我使用useEffect时，它想要进行更正。代码段如下：
const navigate = useNavigate();
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated]);
ESLint在useEffect的依赖数组中下划线标记了isAuthenticated，并告诉我：
"React Hook useEffect has a missing dependency: 'navigate'. Either include it or remove the dependency array. eslint react-hooks/exhaustive-deps"
所以我不知道useEffect的依赖数组实际上是如何工作的，或者这是ESLint的一种误解？
P.S. 简而言之，我知道这个数组用于包含会触发useEffect的内容，当它们发生变化时。我说得对吗？
英文:
I installed ESLint into VS code and in my React project it wants to make correction when i use useEffect. The segment of the code is:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const navigate = useNavigate();
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated]);
<!-- end snippet -->
The ESLint underline me isAuthenticated inside of the dependancy array of useEffect and tells me that:
React Hook useEffect has a missing dependency: 'navigate'. Either include it or remove the dependency array.eslintreact-hooks/exhaustive-deps
So i dont know how actualy dependancy array of useEffect work or this is some sort of missunderstaning of eslint ?
P.S. Long story short that i know about this array is there is staying thinks that trigger this useEffect when they are changed. Am i right?
答案1
得分: 0
回答你的问题，你是对的。将那个变量放在 useEffect 的末尾意味着，当依赖变量的值发生变化时，效果会运行。
ESLint 提供警告是因为它检测到 navigate 函数在 useEffect 回调内部使用，但未在依赖数组中列出。
在依赖数组中包括 navigate 函数：
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated, navigate]); // 将 'navigate' 添加到依赖数组中
或者，你可以禁用特定行的 ESLint 规则：
// eslint-disable-next-line react-hooks/exhaustive-deps
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated]);
如果你仍然遇到问题，请告诉我。
英文:
To answer your question, you're right. Putting that variable at the end of useEffect means that, the effect runs when dependency variable value changes.
ESLint is providing a warning because it detects that the navigate function is used inside the useEffect callback, but it's not listed as a dependency in the dependency array.
Include the navigate function from the dependency array:
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated, navigate]); // Add 'navigate' to the dependency array
OR, you can Disable the ESLint rule for the specific line:
// eslint-disable-next-line react-hooks/exhaustive-deps
useEffect(() => {
if (isAuthenticated) {
navigate("/");
}
}, [isAuthenticated]);
Let me know, if you still having the issue.
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