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=5.0.3&sourceType=module&code=KYDwDg9gTgLgBAYwgOwM72MgrgWzgFQE8xgAxAGwEMBzVOAbwCg44BBZQuAXjgEY4APALgAGADTM4AVWQBrZBADuybn0HDeElgGUYUAJbJqq-kLgAmLXAByuAEbAoJ9XADMVgEIQI5YJRU8psIALIwAvoyMoJCwcABmWMgIMPoocAAWlKhEJBQ0ABSoEFhQCMAAXATEZFS0YnAwlFDUwDCVOTU0qACUDJJQrSUqhcWlwHAAZA1NLTC9XAvTza0A3OFAA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUFvcgAQBcBPABxQGNoBLEggWhXioDsCB6ZgeztmeQEMAZogbNYAWzrlO4kv2rJOzdFETRonaJHBgAviF1A&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA

Repro Code

export const enum TypeFlags {
  Any = 1 << 0,
  Unknown = 1 << 1,
  String = 1 << 2,
  Number = 1 << 3,
  Boolean = 1 << 4
}

export function hasTypeFlag(source: TypeFlags, target: TypeFlags) {
  return (source & target) === target;
}

ESLint Config

module.exports = {
  "rules": {
        "@typescript-eslint/no-unsafe-enum-comparison": "error"
  }
}

tsconfig

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

Expected Result

TypeScript compiler is using bit mask pattern internally. It is rare, but useful thing. A bitwise operator is used in comparison, but otherwise enum is compared with itself. Should this be allowed or at least have a config option, perhaps? What do you think?

Also possible to rework the code. It felt more readable with ===, but could be like this too:

export function hasTypeFlag(source: TypeFlags, target: TypeFlags) {
  return Boolean(source & target);
}

Actual Result

Good idea to add the no-unsafe-enum-comparison. As you can see in reproduction, currently it does not work with bit mask pattern. Might be it was simply overlooked use case.

Additional Info

No response