[unicorn/prefer-at] should avoid auto fix " parent?.childNodes[parent.childNodes.length - 1];"

Description

parent?.childNodes[parent.childNodes.length - 1];

parent?.childNodes.at(-1);

Contributor guide

Tech stack

javascriptnodejs

Domain

developer experiencetooling

Issue type

bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

ESLint plugin developmentAST manipulation

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

40

Research direction

Examine the rule implementation in the source file (likely rules/prefer at.js). Understand how the auto fix currently handles optional chaining. Look at existing tests to see if there is a test case for optional chaining with computed length. Consider adding a case to avoid the fix when the member expression uses optional chaining and the index is based on the parent's length property. Collaborate with maintainers for desired behavior.