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=4.9.5&sourceType=module&code=MYewdgzgLgBAZiEAuGAlApqATgEwDzRYCWYA5gDQxgCuAtgEbpYB8MAvDAN4C+A3ALAAoUJFj0AhlhSESpdjADkAa3QBPBQMFCEIANoSsAXRgB+ExwAMvGAHob8RPsnGiEKiFgkiUIuIA2RABe6DiU9NSwIjjeROD+MOIQEESkYLToYJ5ucH7ipKQhCW7UYGCY6EmSqgB02o4GxgDUHACMmkA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0yHJgBNK+SpPRRE0aB2iRwYAL4gtQA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eFYDAruuGAL4g9A

Repro Code

constfoo:Record<string,number>={};constbar:string='key';foo[bar]??=0;// foo[bar] is not initialized, but conditional assignment is flagged as unnecessary.foo[bar]+=1;

ESLint Config

module.exports={parser:"@typescript-eslint/parser",rules:{"@typescript-eslint/no-unnecessary-condition":"error",},};

tsconfig

{"compilerOptions": {"strict":true  }}

Expected Result

No warning.

Actual Result

Unnecessary conditional, expected left-hand side of?? operator to be possibly null or undefined. 4:1 - 4:9

Additional Info

This is basically#6264 which was fixed in#6452; I guess it resurfaced because the rule now checks logical assignments as of#6594.