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=5.7.2&fileType=.tsx&code=MYewdgzgLgBAhjAvDA5AIxQWAFA4CYCmwANnAE4EzEGwAeAXDAN7yPRkCWYA5gDQxo2UTjxgBfGAB8YYAK7FiOHLQD8AOgQBCZHIUwVMWgG04AXRiMUAMxAgsubAVoAHEGVgsxQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0WlqYSNkAC1pkA9gEMkyMswDm6KL2jjokcGAC%2BILUA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

consta='b';declareletx:{a:string,b:string}|nullx?.a!=null ?x[a] :'foo'

ESLint Config

module.exports={parser:"@typescript-eslint/parser",rules:{"@typescript-eslint/prefer-nullish-coalescing":["error"],},};

tsconfig

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

Expected Result

x?.a != null ? x[a] : 'foo' should not report

Actual Result

x?.a != null ? x[a] : 'foo' reports

Additional Info

Raised in#10733 (comment)

Root cause: the rule doesn't handle well computed members.

A fix is ready in the perimeter of#10861:f69b588

✅PR branch playground

Cc@kirkwaiblinger