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=5.0.3&sourceType=module&code=GYVwdgxgLglg9mABAUwB4EMC2AHANsgHgBUA+ACgChFF0AnAcwC5EiAaKxTdbZsmKZJmZEAlIgC8JGmACeExP0ESpizIgD86xAHJtFMQG8AvhTRY8yMmBC5cIgNxA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0yHJgBNK+SpPRQA7iKaRwYAL4hNQA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3QAacDUhFYAVSJsS6ACYAFAIaYN8dHizCwAMw2plkmlFkKlqgDKxopwybPopAXxAegA

Repro Code

functionexample<T>(arg:T,map:(item:T)=>any=item=>item??''){}example(null);

ESLint Config

{"rules":{"@typescript-eslint/no-unnecessary-condition":"warn"}}

tsconfig

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

Expected Result

No eslint errors.

Actual Result

Unnecessary conditional, expected left-hand side of?? operator to be possibly null or undefined

Additional Info

Left-hand side of?? operator can clearly be null as shown with theexample(null) call.
Type hint for theexample(null) call is the following:
function example<null>(arg: null, map?: (item: null) => any): void