accelint-ts-best-practices
Comprehensive TypeScript/JavaScript coding standards focusing on type safety, defensive programming, and code correctness. Use when (1) Writing or reviewing TS/JS code, (2) Fixing type errors or avoiding any/enum/null, (3) Implementing control flow, state management, or error handling, (4) Applying zero-value pattern or immutability, (5) Code review for TypeScript anti-patterns. Covers naming conventions, function design, return values, bounded iteration, input validation. For performance optimization, use accelint-ts-performance skill. For documentation, use accelint-ts-documentation skill.
What this skill does
# JavaScript and TypeScript Best Practices Comprehensive coding standards for JavaScript and TypeScript applications, designed for AI agents and LLMs working with modern JavaScript/TypeScript codebases. **Note:** This skill focuses on general best practices, TypeScript patterns, and safety. For performance optimization, use the `accelint-ts-performance` skill instead. ## When to Use This Skill This skill provides expert-level patterns for JavaScript and TypeScript code. Load [AGENTS.md](AGENTS.md) to scan rule summaries and identify relevant optimizations for your task. ## How to Use This skill uses a **progressive disclosure** structure to minimize context usage: ### 1. Start with the Overview (AGENTS.md) Read [AGENTS.md](AGENTS.md) for a concise overview of all rules with one-line summaries organized by category. ### 2. Load Specific Rules as Needed When you identify a relevant pattern or issue, load the corresponding reference file for detailed implementation guidance: **Quick Start:** - [quick-start.md](references/quick-start.md) - Complete workflow examples with before/after code **General Best Practices:** - [naming-conventions.md](references/naming-conventions.md) - Descriptive names, qualifier ordering, boolean prefixes - [functions.md](references/functions.md) - Function size, parameters, explicit values - [control-flow.md](references/control-flow.md) - Early returns, flat structure, block style - [state-management.md](references/state-management.md) - const vs let, immutability, pure functions - [return-values.md](references/return-values.md) - Return zero values instead of null/undefined - [misc.md](references/misc.md) - Line endings, defensive programming, technical debt - [code-duplication.md](references/code-duplication.md) - Extract common patterns, DRY principle, when to consolidate **TypeScript:** - [any.md](references/any.md) - Avoid any, use unknown or generics - [enums.md](references/enums.md) - Use as const objects instead of enum - [type-vs-interface.md](references/type-vs-interface.md) - Prefer type over interface - [bundler-paths.md](references/bundler-paths.md) - Use statically analyzable import and file-system paths for optimal bundling **Safety:** - [input-validation.md](references/input-validation.md) - Validate external data with schemas - [assertions.md](references/assertions.md) - Split assertions, include values - [error-handling.md](references/error-handling.md) - Handle all errors explicitly - [error-messages.md](references/error-messages.md) - User-friendly vs developer-specific messages **Performance:** - **For performance optimization tasks**, use the `accelint-ts-performance` skill for comprehensive profiling workflows and optimization patterns **Documentation:** - **For documentation tasks**, use the `accelint-ts-documentation` skill for comprehensive JSDoc and comment guidance ### 3. Apply the Pattern Each reference file contains: - ❌ Incorrect examples showing the anti-pattern - ✅ Correct examples showing the optimal implementation - Explanations of why the pattern matters ### 4. Use the Report Template When this skill is invoked, use the standardized report format: **Template:** [`assets/output-report-template.md`](assets/output-report-template.md) The report format provides: - Executive Summary with impact assessment - Severity levels (Critical, High, Medium, Low) for prioritization - Impact analysis (potential bugs, type safety, maintainability, runtime failures) - Categorization (Type Safety, Safety, State Management, Return Values, Code Quality) - Pattern references linking to detailed guidance in references/ - Phase 2 summary table for tracking all issues **When to use the audit template:** - Skill invoked directly via `/accelint-ts-best-practices <path>` - User asks to "review code quality" or "audit code" across file(s), invoking skill implicitly **When NOT to use the report template:** - User asks to "fix this type error" (direct implementation) - User asks "what's wrong with this code?" (answer the question) - User requests specific fixes (apply fixes directly without formal report)
Related in Design
contribute
IncludedLocal-only OSS contribution command center. Auto-refreshes the user's in-flight PR and issue state on invoke so conversations start with full context — no need to brief Claude on what's in flight. Helps the user find issues to contribute to on GitHub, builds per-repo dossiers of what each upstream expects (CLA, DCO, branch convention, AI policy, draft-first, review bots, issue templates), runs deterministic gates before any external action so AI-assisted contributions don't reach maintainers as slop. State is markdown-only: candidate files at ~/.contribute-system/candidates/, repo dossiers at ~/.contribute-system/research/, append-only event log at ~/.contribute-system/log.jsonl. No database, no cloud calls. Use when the user asks about their PRs / issues / contributions, wants to find new work to take on, claim an issue, build/refresh a repo's dossier, or draft a Design Issue or PR. Trigger with "/contribute", "what's my PR status", "find a contribution", "claim issue X", "draft a Design Issue for Y", "refresh dossier for Z".
architectural-analysis
IncludedUser-triggered deep architectural analysis of a codebase or scoped subtree across eight modes — information architecture, data flow, integration points, UI surfaces, interaction patterns, data model, control flow, and failure modes. This skill should be used when the user asks to "diagram this codebase," "map the architecture," "show the data flow," "give me an ERD," "trace control flow," "find the integration points," "verify the layout pattern," "audit the UX architecture," or any similar request whose primary deliverable is mermaid diagrams plus cited reports under docs/architecture/. Dispatches haiku/sonnet sub-agents in parallel for per-mode exploration, then verifies every citation mechanically before any node lands in a diagram. Not for one-off prose explanations of code (use code-explanation) or for high-level system design from scratch (use system-design).
mcp
IncludedModel Context Protocol (MCP) server development and tool management. Languages: Python, TypeScript. Capabilities: build MCP servers, integrate external APIs, discover/execute MCP tools, manage multi-server configs, design agent-centric tools. Actions: create, build, integrate, discover, execute, configure MCP servers/tools. Keywords: MCP, Model Context Protocol, MCP server, MCP tool, stdio transport, SSE transport, tool discovery, resource provider, prompt template, external API integration, Gemini CLI MCP, Claude MCP, agent tools, tool execution, server config. Use when: building MCP servers, integrating external APIs as MCP tools, discovering available MCP tools, executing MCP capabilities, configuring multi-server setups, designing tools for AI agents.
react-native-skia
IncludedDesign, build, debug, and optimise high-polish animated graphics in React Native or Expo using @shopify/react-native-skia, Reanimated, and Gesture Handler. Use when the user wants canvas-driven UI, shaders, paths, rich text, image filters, sprite fields, Skottie, video frames, snapshots, web CanvasKit setup, or performance tuning for custom motion-heavy elements such as loaders, hero art, cards, charts, progress indicators, particle systems, or gesture-driven surfaces. Also use when the user asks for fluid, glow, glass, blob, parallax, 60fps/120fps, or GPU-friendly animated effects in React Native, even if they do not explicitly say "Skia". Do not use for ordinary form/layout work with standard views.
plaid
IncludedProduct Led AI Development — guides founders from idea to launched product. Six capabilities: Idea (discover a product idea), Validate (pressure-test the idea against fatal flaws, problem reality, competition, and 2-week MVP feasibility), Plan (vision intake + document generation), Design (translate image references into a design.md spec), Launch (go-to-market strategy), and Build (roadmap execution). Use when someone says "PLAID", "plaid idea", "help me find an idea", "product idea", "idea from my business", "idea from my expertise", "plaid validate", "validate my idea", "pressure-test", "is this idea good", "find fatal flaws", "validate the problem", "plan a product", "define my vision", "generate a PRD", "product strategy", "plaid design", "design from image", "translate image to design", "create design.md", "extract design tokens", "plaid launch", "go-to-market", "launch plan", "GTM strategy", "launch playbook", "plaid build", "build the app", "start building", or "execute the roadmap".
nextjs-framer-motion-animations
IncludedAdds production-safe Motion for React or Framer Motion animations to Next.js apps, including reveal, hover and tap micro-interactions, whileInView, stagger, AnimatePresence, layout and layoutId transitions, reorder, scroll-linked UI, and lightweight route-content transitions. Use when the user asks to add, refactor, or debug Motion or Framer Motion in App Router or Pages Router codebases, especially around server/client boundaries, reduced motion, LazyMotion, bundle size, hydration, or route transitions. Avoid for GSAP-style timelines, WebGL or 3D scenes, heavy scroll storytelling, or CSS-only effects unless Motion is explicitly requested.