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Bug: [no-use-before-define] something wrong with function #11278

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Closed
4 tasks done
momei-LJM opened this issue Jun 6, 2025 · 1 comment
Closed
4 tasks done

Bug: [no-use-before-define] something wrong with function #11278

momei-LJM opened this issue Jun 6, 2025 · 1 comment
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bug Something isn't working package: eslint-plugin Issues related to @typescript-eslint/eslint-plugin working as intended Issues that are closed as they are working as intended

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@momei-LJM
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Before You File a Bug Report Please Confirm You Have Done The Following...

  • I have tried restarting my IDE and the issue persists.
  • I have updated to the latest version of the packages.
  • I have searched for related issues and found none that matched my issue.
  • I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.8.2&fileType=.ts&code=FDBmFcDsGMBcEsD2kAEpIAoCUKDeLgUVpkBnWFAIxQF4UBDYAX2BMnIdpQEYQg&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQHYHsBaWZRQgI0QDN9oyATagS10XSnyqsgBpxtIAAQAuATwAOKAMbQm44YRTwWwgPQFipCtVoNmrdgG1%2B2KImjRavE9iymBiXLAC2qDMLiIbEAL42Auvx%2BPkA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

function fn() { 
  const b = a
}
const a = 1

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
{
  "rules": {
    "no-use-before-define": "off",
    "@typescript-eslint/no-use-before-define": [
      "error",
      {
        "enums": true
      }
    ]
  }
}
};

tsconfig

{
  "compilerOptions": {
    // ...
  }
}

Expected Result

It is reasonable to use the post-defined function within the function.
for example:

const cb = ()=>{
 await fetch( { pagesize } )
}
const {pagesize} = usePage({cb}) 

Actual Result

The rules do not support

Additional Info

No response

@momei-LJM momei-LJM added bug Something isn't working package: eslint-plugin Issues related to @typescript-eslint/eslint-plugin triage Waiting for team members to take a look labels Jun 6, 2025
@bradzacher
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The rule errors because it's easy to write broken code like this. For example:

function fn() { 
  const b = a
}
fn();

const a = 1 

This code will crash.

@bradzacher bradzacher added working as intended Issues that are closed as they are working as intended and removed triage Waiting for team members to take a look labels Jun 6, 2025
@bradzacher bradzacher closed this as not planned Won't fix, can't repro, duplicate, stale Jun 6, 2025
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Labels
bug Something isn't working package: eslint-plugin Issues related to @typescript-eslint/eslint-plugin working as intended Issues that are closed as they are working as intended
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