sf-lwc

sf-lwc: Lightning Web Components Development

Use this skill when the user needs Lightning Web Components: LWC bundles, wire patterns, Apex/GraphQL integration, SLDS 2 styling, accessibility, performance work, or Jest unit tests.

When This Skill Owns the Task

Use sf-lwc when the work involves:

• lwc/**/*.js, .html, .css, .js-meta.xml
• component scaffolding and bundle design
• wire service, Apex integration, GraphQL integration
• SLDS 2, dark mode, and accessibility work
• Jest unit tests for LWC

Delegate elsewhere when the user is:

• writing Apex controllers or business logic first → sf-apex
• building Flow XML rather than an LWC screen component → sf-flow
• deploying metadata → sf-deploy

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Required Context to Gather First

Ask for or infer:

• component purpose and target surface
• data source: LDS, Apex, GraphQL, LMS, or external system via Apex
• whether the user needs tests
• whether the component must run in Flow, App Builder, Experience Cloud, or dashboard contexts
• accessibility and styling expectations

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Recommended Workflow

1. Choose the right architecture

Use the PICKLES mindset:

• prototype
• integrate the right data source
• compose component boundaries
• define interaction model
• use platform libraries
• optimize execution
• enforce security

2. Choose the right data access pattern

Need	Default pattern
single-record UI	LDS / getRecord
simple CRUD form	base record form components
complex server query	Apex @AuraEnabled(cacheable=true)
related graph data	GraphQL wire adapter
cross-DOM communication	Lightning Message Service

3. Start from an asset when useful

Use provided assets for:

• basic component bundles
• datatables
• modal patterns
• Flow screen components
• GraphQL components
• LMS message channels
• Jest tests
• TypeScript-enabled components

4. Validate for frontend quality

Check:

• accessibility
• SLDS 2 / dark mode compliance
• event contracts
• performance / rerender safety
• Jest coverage when required

5. Hand off supporting backend or deploy work

Use:

• sf-apex for controllers / services
• sf-deploy for deployment
• sf-testing only for Apex-side test loops, not Jest

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High-Signal Rules

• prefer platform base components over reinventing controls
• use @wire for reactive read-only use cases; imperative calls for explicit actions and DML paths
• do not introduce inaccessible custom UI
• avoid hardcoded colors; use SLDS 2-compatible styling hooks / variables
• avoid rerender loops in renderedCallback()
• keep component communication patterns explicit and minimal

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Output Format

When finishing, report in this order:

1. Component(s) created or updated
2. Data access pattern chosen
3. Files changed
4. Accessibility / styling / testing notes
5. Next implementation or deploy step

Suggested shape:

LWC work: <summary>
Pattern: <wire / apex / graphql / lms / flow-screen>
Files: <paths>
Quality: <a11y, SLDS2, dark mode, Jest>
Next step: <deploy, add controller, or run tests>

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Local Development Server

Preview LWC components locally with hot reload — no deployment needed:

# Preview LWC components in isolation
sf lightning dev component --target-org <alias>

# Preview a Lightning Experience app locally
sf lightning dev app --target-org <alias>

# Preview an Experience Cloud site locally
sf lightning dev site --target-org <alias>

In current SF CLI releases, these Local Dev commands are installed just-in-time the first time you run them. They are long-running processes that open a browser with live preview. Changes to .js, .html, and .css files auto-reload instantly. Requires an active org connection for data and Apex callouts.

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Cross-Skill Integration

Need	Delegate to	Reason
Apex controller or service	sf-apex	backend logic
embed in Flow screens	sf-flow	declarative orchestration
deploy component bundle	sf-deploy	org rollout
create metadata like message channels	sf-metadata	supporting metadata

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Reference Map

Start here

• references/component-patterns.md
• references/slds-design-guide.md
• references/lwc-best-practices.md
• references/scoring-and-testing.md
• references/jest-testing.md

Accessibility / performance / state

• references/accessibility-guide.md
• references/performance-guide.md
• references/state-management.md
• references/template-anti-patterns.md

Integration / advanced features

• references/lms-guide.md
• references/flow-integration-guide.md
• references/advanced-features.md
• references/async-notification-patterns.md
• references/triangle-pattern.md
• assets/

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Score Guide

Score	Meaning
150+	production-ready LWC bundle
125–149	strong component with minor polish left
100–124	functional but review recommended
< 100	needs significant improvement