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=.tsx&code=FAEwpgxgNghgTmABAMwK4DsIBcCWB7dRVAZzABk8Zw4ARGLGAHgBVEBeRGdATwD4AKAJQAuRMwDcwYBALEsiAN4o8eRAF92RUhSpha9GEM7FFyvKLlwc6AObrJQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWkOTJE0fJQ5N0UOdA7RIAGnBgAviD1A&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

declare function useLoaderData<T = any>(): T;

const { foo } = useLoaderData() as { foo: string };

ESLint Config

{
  "rules": {
    "@typescript-eslint/no-unnecessary-type-assertion": "error",
  }
}

tsconfig

{
  "compilerOptions": {
    "strictNullChecks": true
  }
}

Expected Result

No error.

Actual Result

False positive.

Additional Info

I use useLoaderData from the react-router package.

I could rewrite the code like this:

declare function useLoaderData<T = any>(): T;

const { foo } = useLoaderData<{ foo: string }>();

But this is functionally equivalent, and I think the rule shouldn't error in this case.