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=5.4.5&showAST=es&fileType=.tsx&code=FAEwpgxgNghgTmABAMwK4DsIBcCWB7dFACgA8AuRdVAWwCMw4BKCjAa3TwHd0BuYAegBUgxAAFwABwQQYWMCESD%2BicNHhI0mXAWLlEtPHihgY6ZojYdufYMiIBGRnztY4qME%2BBA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6WJygM0sQBNaySgHMmAQ3yxoKdGACM4MAF8QSoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

declare function f(x: number): unknown;
/** @deprecated */ declare function f(x: boolean): unknown;

f(1);
f(true);

ESLint Config

{
  "rules": {
    "@typescript-eslint/unified-signatures": 1
  }
}

tsconfig

No response

Expected Result

It should not warn, because the two signatures cannot be unified. Note that the call f(true) is striked as "deprecated", and it would not be possible for it to happen if the two function declarations were merged into a single one.

Actual Result

It reports

These overloads can be combined into one signature taking number | boolean.

Additional Info

No response