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=4.9.3&sourceType=module&code=KYDwDg9gTgLgBAMwK4DsDGMCWEVwObAwA8A8gEYBWANHANLACecoMwKAJgM5wDWjECOOQoA+ABQRKALiGUafBjPoMAlHADeAKDhw0OTvABuAQwA2SYHAC8cSRQDaCgLoBubXEyCxJ88DVadHShCJChcHws3HQBfdxgACygIAHc4FGBUgFEoJKgxAHIAIRISAFkAQnyVTVjNAhgxdUQICBkUJFNTOGiaACIEFt6VFyA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0yHJgBNK+SpPRRE0aB2iRwYAL4gtQA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA

Repro Code

exportfunctionget<Obj,KeyextendskeyofObj>(obj:Obj,key:Key){constvalue=obj[key];if(value){returnvalue;}thrownewError('BOOM!')}get({foo:null},"foo");

ESLint Config

module.exports={"parser":"@typescript-eslint/parser","parserOptions":{"ecmaVersion":"latest","sourceType":"module","project":"./tsconfig.json"},"plugins":["@typescript-eslint"],"rules":{"@typescript-eslint/no-unnecessary-condition":"error"}}

tsconfig

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

Expected Result

No error.

Actual Result

The rule flagsif (value) as error because it thinksvalue is always truthy.

Additional Info

The type of value isObj[Key] here. Maybe the rule wrongly thinks that generic lookup types are always truthy.