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=5.7.2&fileType=.ts&code=C4TwDgpgBAylC8UCMAGA3AKAwem1AThGAPb7AQAmUAxqYdcADYga0B2AzsFAIYJQByHgN4caxTsEzsuUAEb8AzKKiLpE2dX6oVMTK0Y8OYgCpQA3hihRcUDgAtiAV0ZU50QiTKUA-FYIQPBQSzLz8QiJG4pL%2BhEEhIPJKKoqxgcFsoVqIOlEwGAC%2BQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWkOTJE0fJQ5N0UOdA7RI4MAF8QOoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

type S = 10;

// reported correctly
const a = 'a' as const;
const b = 3 as 3;
const c = 10 as S;

class T {
  // should be reported?
  readonly a = 'a' as const
  readonly b = 3 as 3
  readonly c = 10 as S
}

ESLint Config

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

tsconfig

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

Expected Result

I expected these to be reported, similarly to the const declarations.

Actual Result

The various readonly declarations haven't been reported.

Additional Info

No response