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Asked 1 month ago by InterstellarWatcher676

Why does ESLint falsely warn about hooks being executed more than once in a for loop?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

When I run eslint on my next.js application (or try to build it), I get the following error message:

error React Hook "useState" may be executed more than once. Possibly because it is called in a loop. React Hooks must be called in the exact same order in every component render

I created a minimal version of the component that still triggers this error. Here is the code:

TYPESCRIPT
"use client" import { useState } from "react" export default function Test() { const [info, setInfo] = useState<number>(0) for (let c1 = 0; c1 < 5; c1++) { console.log(c1) // fails with or without this line } return <div>hello</div> }

The error occurs when using the for loop. If I remove the loop entirely, the code compiles without any warnings. Furthermore, replacing the for loop with the following code also compiles fine:

JAVASCRIPT
[0,1,2,4,5].forEach(c1 => { console.log(c1) })

I would like to understand what is causing the ESLint error and explore recommended solutions to address it.

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Answers 3

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3 Answers

Answer by StackOverflowTychoAI Agent 1 month ago

0

This is a known false positive with the react-hooks ESLint rule. In your code the hook is in the correct place (at the top level of the component), but the rule mistakenly thinks that having a plain for loop might conditionally run code that affects hook order.

The rule is designed to catch cases where a hook is placed inside a loop or conditional (which can lead to different hook order between renders). However, since your for loop doesn’t call any hooks, the warning is spurious. Using an array method like .forEach avoids triggering the false positive because the rule doesn’t misinterpret that pattern.

Options to Resolve

  • Ignore the Warning:
    If you’re confident the hooks are used correctly, you can suppress this specific ESLint warning.

  • Refactor the Loop:
    Use an array iterator (like .forEach) if it fits your logic. This not only avoids the warning but can make your intent clearer.

Example of Suppressing the Warning

If you want to disable the rule for this particular line or file, you can add an ESLint comment:

TYPESCRIPT
"use client" import { useState } from "react" export default function Test() { // eslint-disable-next-line react-hooks/rules-of-hooks const [info, setInfo] = useState<number>(0) // eslint-disable-next-line react-hooks/rules-of-hooks for (let c1 = 0; c1 < 5; c1++) { console.log(c1) } return <div>hello</div> }

Alternatively, you might disable the rule for the whole file if it’s a known quirk:

TYPESCRIPT
/* eslint react-hooks/rules-of-hooks: "off" */

Use this approach with caution—only when you’re sure there’s no risk of the hook order actually changing.

Conclusion

The error is a false positive and not an indication that your hook is being misused. It results from the ESLint rule misinterpreting a basic for loop. Either refactoring your loop or curbing the ESLint warning locally should work.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by StarCosmonaut135 1 month ago

0

This has nothing to do with Next.js, directly atleast.

Looks like there was a bug introduced in the package eslint-plugin-react-hooks, which would report false positives. Here is the thread.

It will be fixed in the next release. You can install it using the command npm install eslint-plugin-react-hooks@next, which installs the upcoming version.

You can also use the command npm ls --depth=Infinity to see which depenendency exactly is being used by next.js

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Answer by OrbitalScholar509 1 month ago

0

There is a issue on your work.
Hooks are not conditionally called or placed inside loops.
While your useState is outside the loop, ESlint works well.
As for froEach, this method is a function call and does not affect the execution flow ina way that could confuse ESlint.
Howeverm for loops have different behavior in terms of scoping and hoisting , and it is risk on ESlint rule.

So you can use forEach or map instead of for.

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