[Bug]: Documentation for hooks: warning about infinite loop useEffect with state update is not prominent

Summary

Description

The documentation for React Hooks (especially useEffect) mentions that updating state inside an effect without a proper dependency array can cause infinite loops, but this warning is not highlighted prominently. Many beginners miss this and end up in render loops.

Given how frequently this issue occurs, the documentation should emphasize it more clearly, perhaps with a bold warning and a simple example.

Example that causes confusion

import React, { useState, useEffect } from "react";

function MyComponent() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    setCount(c => c + 1);
  }); // Missing dependency array

  return <div>{count}</div>;
}

Running this causes an infinite render loop because setCount triggers a state update on every render, re-invoking useEffect.

Actual behavior

• Docs mention dependency arrays briefly, but the infinite loop risk is not highlighted enough.
• Beginners often miss this and think React is “re-rendering infinitely” due to a bug.

Expected behavior

• The official docs should include a bold, visible warning in the useEffect section, such as:

Warning: Omitting the dependency array causes the effect to run after every render, potentially leading to infinite loops if state or props are updated inside.

• Include a small “bad vs. good” code example pair to clarify.

Why this matters

This is one of the most common pitfalls for new React developers. Making the warning prominent in official docs will help reduce confusion and GitHub issues related to infinite re-renders.

Environment

• React version: 18.x (or whichever version is current)
• Browser: Chrome 118
• OS: Windows 11 / Ubuntu 22.04

Additional info

Several discussions online highlight this confusion; here’s one example:
https://www.reddit.com/r/reactjs/comments/oomo1w/what_are_the_biggest_issues_you_see_with_react_in/

Page

https://react.dev/reference/react/useEffect

Details

The warning could be moved closer to the main example or highlighted with a strong visual cue (e.g., bold text or a red caution box).
This would help prevent confusion among new React users who encounter infinite loop behavior.

从 issue 中链接的 useEffect 参考页面开始，检查当前对依赖数组和主要示例的说明方式。突出显示关于无限循环的警告，并添加一个简洁的错误示例与正确示例，然后确认页面清楚地说明了在没有依赖数组的情况下从 effect 更新 state 的风险。