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 havesearched for related issues and found none that matched my issue.
• I haveread the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play#ts=5.0.1-rc&sourceType=module&code=CYUwxgNghgTiAEYD2A7AzgF3lAXPARFPvAD4EBGxZKArgLbkgwDcAUK2gO4CWGYAFvAAUUAJTwA3q3iIoaBIXx5ycKAGs2MsHIWVlqjawC+rIA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6ZAd0vzIAt6AHrwCGsZPkoA3RExTJafRGQDW6KImjQA9tEjgwAXxAGgA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA

Repro Code

declareconsta:"a"|"b"|number;switch(a){case"a":break;case"b":break;}

ESLint Config

module.exports={"rules":{"@typescript-eslint/switch-exhaustiveness-check":"error"}}

tsconfig

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

Expected Result

No error, no suggestion fixer, or suggestion to add a default case

Actual Result

Fixer producescase number:, which is invalid syntax.

Additional Info

I'm not sure what the best fix for this issue is, so I hope to get more discussion first.