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=5.6.3&fileType=.ts&code=DYUwLgBAhhC8EEZoGcIDsCuBbARiAThAD4QZoAmIAZgJZojkDcAsAFBQCEA1F40A&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQA7UQDNFoBaAYwHsA7ZAF3ShOkuknDAF8ROg&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=true

Repro Code

let a = 1 as number | undefined;
a!++;

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
  rules: {
    "prefer-const": "error",
  },
};

tsconfig

No response

Expected Result

It should not error.

Actual Result

ESLint shows a message 'a' is never reassigned. Use 'const' instead. 1:5 - 1:6

Additional Info

Similar to #2804