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=5.9.2&fileType=.tsx&code=JYWwDg9gTgLgBAbzgVwM4FMDCBDANrgI2wGMBrOAXzgDMoIQ4ByKdEmRgbgFgAoX4iADtU8ANrYANHAJTicALxNGAXQVNU9dCKiMAdKjC5gMABR7GASm58eA4fAD6IAJ458RMmrRY8hEqRNeODgTADc8ZHQALjhBZBACdChRVUUUqQgwJOwYaAB%2BGO1gQQBzCwUAPjhRXVrw3EiMrKgc6GUJIOrJaVllXiteXhhnLLgABWwWkFQ1MboQYAwAHiQAD0KYKGKSlMoK634hETgHMDpiLVQJqZnFbFRnQTkTMEnsaZjr99Ry%2BSqETp2Y5rGKiBzdBwyE5yRSMACMACYAMwqShqbAAd2wxjgrxu1go1iAA&eslintrc=N4KABGBEBOCuA2BTAzpAXGYkACAXAngA4oDG0AlobgLQrzkB2uA9AwPbWzKJLLLUATRADMAhghqi%2B5AOYMAtoibooiaNDbRIAXxDagA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

import{useCallback}from'react';const[a,b,c='']='somestr'.split('.');const_myCallback=useCallback((value:number[]=[],operator?:string)=>[...value,operator],[a,b,c]);typeParams=Promise<{x:string[]}>;const_processParams=async(params:Params)=>{const{x:[_a,_b,_c='123']}=awaitparams;};

ESLint Config

module.exports={"rules":{"@typescript-eslint/no-useless-default-assignment":"error"}}

tsconfig

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

Expected Result

None of these uses should get flagged under this rule.

Actual Result

"Default value is useless because the (parameter|property) is not optional."

Arrays are assumed to be of indefinite length

const [a, b, c = ''] = 'somestr'.split('.');
const { x: [_a, _b, _c = '123'] } = await params;

These are only useless assignments when the array is of sufficient length.

Something about useCallback makes arg defaults get flagged

(value: number[] = [], operator?: string) => [...value, operator]

This works in isolation, but inside of useCallback, it gets flagged.

Additional Info

No response