definition for rule 'import/extensions' was not found.eslint(import/extensions) code example

Example: eslint missing file extension ts

"rules": {
   "import/extensions": [
      "error",
      "ignorePackages",
      {
        "js": "never",
        "jsx": "never",
        "ts": "never",
        "tsx": "never"
      }
   ]
}