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Bug: [no-unnecessary-type-parameters] double false positive #9524

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@abrahamguo

Description

@abrahamguo

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=5.5.2&fileType=.ts&code=KYDwDg9gTgLgBAYwgOwM7wLYEMwHkBGAVnALxwA8A0nKDMMgCapzpQCWyA5gDRwBqvACoA%2BABQQiALjgBvOAG0A1sACecDnEoBdAPzS%2BcAL68AZsmmjlK6ZV4A3LABt9ASlLC4gtyWEAoOHAEhMAIMAB09DDswKjiRC5h2GCikVBqPnBmomE5qWpYzPK2-FouLgDcQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWsRFCAtonyJoqDJCXQO0SODABfELqA&tsconfig=&tokens=false

Repro Code

export const mapObj = <K extends string, V, T>(obj: { [key in K]?: V }, fn: (key: K, val: V) => T) =>
  Object.entries(obj).map(entry => fn(...entry as [K, V]));

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
  rules: {
    "@typescript-eslint/no-unnecessary-type-parameters": "error",
  },
};

Expected Result

The rule should not report on VV is used 3 times

Actual Result

The rule claims that V is only used once, when it's actually used 3 times.

Additional Info

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    accepting prsGo ahead, send a pull request that resolves this issuebugSomething isn't workinglocked due to agePlease open a new issue if you'd like to say more. See https://typescript-eslint.io/contributing.package: eslint-pluginIssues related to @typescript-eslint/eslint-plugin

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