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Lwc Reactive State Patterns

Category: Engineering  ·  Sub-category: performance  ·  Last updated:
How LWC reactivity actually works after Spring '20 (API v48+) — every class field is reactive on reassignment, but @track is still required for in-place mutation of plain object/array contents, and Date / Set / Map mutations are NEVER observed. Covers the renderedCallback infinite-loop trap, reactive-getter caching rules, and when @track is genuinely needed today. NOT for @wire reactive parameters (see lwc/wire-adapters), NOT for Lightning Data Service caching (see lwc/ldws-and-uirecordapi), NOT for cross-component reactive state (see lwc/message-channel-patterns and lwc/state-management-with-modules).

From the source SKILL.md

LWC reactivity has had two eras. Before Spring '20 (API v48), every reactive field needed @track. Since Spring '20, all class fields are reactive on reassignment — @track is no longer needed for primitives or for fields that are reassigned. But @track is still required for deep observation of plain object properties and array elements when the field is mutated in place. And no decorator at all makes Date, Set, or Map reactive — those need a re-create-and-reassign discipline.

What this skill does

Lwc Reactive State Patterns is a community-contributed Claude Code skill in the performance sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/lwc-reactive-state-patterns/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Lwc Reactive State Patterns Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

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Manual install (2 steps)

mkdir -p ~/.claude/skills/lwc-reactive-state-patterns
curl -L https://claudskills.com/skills/lwc-reactive-state-patterns/SKILL.md \
  -o ~/.claude/skills/lwc-reactive-state-patterns/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/lwc-reactive-state-patterns/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/lwc-reactive-state-patterns/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\lwc-reactive-state-patterns\SKILL.md on Windows. See the full install guide for step-by-step instructions.

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Attribution & license

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