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=4.8.3&sourceType=module&code=PQKgpgzgNglgdgFwAQAEEE8AOkDGAnGTBAWklkWACMBDOYhCYnAewFtWxEAuJAbQCIwePMzz8AuiGAAoacGCoGpAB7YcJISLxJAvBuALHcCwBDsCWO0cDmO0cBmO9IBmzZgDoaeaUA&eslintrc=N4KABGBEBOCuA2BTAzpAXGYBfEWg&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA

Repro Code

/*eslint @typescript-eslint/ban-ts-comment: ["error"]*/

// @ts-expect-error 👨‍👩‍👧‍👦
foo.bar

ESLint Config

// See a comment in Repro Code

module.exports = {
  "rules": {}
}

tsconfig

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

Expected Result

Report an error because description length is actually 1.

Actual Result

Does not report any errors.

Additional Info

String.prototype.length isn't not enough for this rule. We should to consider to use third party package like https://github.com/orling/grapheme-splitter .

"👨‍👩‍👧‍👦".length; // 11

Versions