Native JavaScript Utility Patterns

Quick Guide: Prefer native JavaScript (ES2022-ES2025) over utility libraries. Use structuredClone for deep cloning, Object.groupBy for grouping, ES2023 immutable array methods (toSorted, toReversed, with), and ES2025 Set methods for set operations. Only reach for utility libraries when native alternatives genuinely don't exist or lack needed features (cancel/flush on debounce, deep merge with array strategies).

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CRITICAL: Before Using This Skill

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST use native ES2022+ methods before considering utility libraries - check this skill first)

(You MUST use immutable array methods (toSorted, toReversed, toSpliced, with) instead of mutating methods)

(You MUST use structuredClone for deep cloning - NOT JSON.parse/JSON.stringify hacks)

(You MUST define named constants for all numeric values - NO magic numbers in utility functions)