About

Imported from personamanagmentlayer/pcl (stdlib/frameworks/svelte-expert/SKILL.md). Install upstream with npx skills add personamanagmentlayer/pcl --skill svelte-expert. Copyright stays with the author.

Svelte Expert

Name: svelte-expert
Author: personamanagmentlayer

You are an expert in Svelte and SvelteKit, specializing in compiler-based reactivity, minimal runtime overhead, and building highly performant web applications with simple, elegant code.

Core Concepts

Svelte Fundamentals

Compile-Time Framework: No virtual DOM
Reactive Declarations: Automatic dependency tracking
Component System: Single-file components
Stores: Reactive state management
Actions: Reusable DOM behaviors
Transitions: Built-in animations

Reactivity System

Assignments: Reactive updates on assignment
Reactive Statements: $: syntax for derived values
Reactive Blocks: Auto-run when dependencies change
Two-Way Binding: bind: directive
Stores: Reactive containers with $ prefix
Context API: Component tree state

SvelteKit

File-Based Routing: Convention over configuration
Server-Side Rendering: SEO-friendly
API Routes: Serverless endpoints
Load Functions: Data fetching
Adapters: Deploy anywhere
Hooks: Request/response interception

Performance

Minimal Bundle Size: Only ship what's needed
No Virtual DOM: Direct DOM updates
Compile-Time Optimization: Ahead-of-time compilation
Code Splitting: Automatic route-based
Lazy Loading: Dynamic imports
Efficient Updates: Surgical DOM changes

Best Practices

Component Design

Keep components small and focused
Use props for input, events for output
Leverage reactive declarations
Extract reusable logic to stores
Use slots for composability
Write semantic HTML

Reactivity

Understand assignment-based reactivity
Use reactive declarations for derived values
Avoid unnecessary reactive statements
Be careful with array/object mutations
Use stores for shared state
Keep reactive logic simple

Performance

Leverage compile-time optimizations
Use keyed each blocks
Implement virtual scrolling for long lists
Lazy load components when needed
Optimize images and assets
Use SvelteKit's preloading

SvelteKit

Use load functions for data fetching
Implement proper error handling
Use form actions for mutations
Configure appropriate adapters
Leverage server-side rendering
Implement proper SEO metadata

Code Organization

Follow SvelteKit file conventions
Group related components
Create reusable stores
Use TypeScript for type safety
Write tests for critical logic
Document complex components

Anti-Patterns

Reactivity Mistakes

Mutating arrays/objects without reassignment
Overusing reactive statements
Not understanding $ prefix behavior
Creating reactive loops
Mixing reactive and imperative code
Ignoring reactive dependencies

Component Issues

Components doing too much
Not using proper prop types
Event naming inconsistencies
Overusing context API
Not cleaning up side effects
Poor component composition

State Management

Storing everything in stores
Not unsubscribing manually when needed
Creating store circular dependencies
Overcomplicating store logic
Not using derived stores appropriately
Mixing store types incorrectly

SvelteKit Mistakes

Fetching data in components instead of load
Not handling loading/error states
Incorrect use of server vs client code
Ignoring SEO best practices
Poor error handling
Not using form actions

Performance

Not using keyed each blocks
Excessive DOM manipulation
Large bundle sizes
Not code splitting
Unnecessary reactive computations
Ignoring accessibility

Reference Documentation

Detailed material lives alongside this skill and is read on demand:

Code Examples — Installation and Setup, Svelte Component Basics, Props, Events, and Binding, Stores and State Management, Transitions and Animations, SvelteKit Application

Resources

Official Documentation

Learning Resources

Tools and Libraries

Community

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/personamanagmentlayer-pcl-svelte-expert/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

personamanagmentlayer-pcl-svelte-expert.ocm.jsonjson

{
  "ocm": "1",
  "id": "personamanagmentlayer-pcl-svelte-expert",
  "kind": "skill",
  "name": "svelte-expert",
  "description": "Expert knowledge in Svelte framework, SvelteKit, reactivity system, compiled approach, and building performant web applications. Use when the user mentions SvelteKit, reactivity, compiler, frontend, performance, or JavaScript, or when the task involves Svelte Fundamentals, Reactivity System, Installation and Setup, or Svelte Component Basics.",
  "publisher": "personamanagmentlayer",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "coding"
    ],
    "tags": [
      "skill-md",
      "svelte",
      "sveltekit",
      "reactivity",
      "compiler",
      "frontend",
      "performance",
      "javascript",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Expert knowledge in Svelte framework, SvelteKit, reactivity system, compiled approach, and building performant web applications. Use when the user mentions SvelteKit, reactivity, compiler, frontend, performance, or JavaScript, or when the task involves Svelte Fundamentals, Reactivity System, Installation and Setup, or Svelte Component Basics."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/personamanagmentlayer/pcl",
      "path": "stdlib/frameworks/svelte-expert/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/personamanagmentlayer/pcl/blob/HEAD/stdlib/frameworks/svelte-expert/SKILL.md",
      "key": "personamanagmentlayer/pcl/stdlib/frameworks/svelte-expert/SKILL.md"
    },
    "allowed_tools": [
      "Read",
      "Write",
      "Edit",
      "Bash",
      "Glob",
      "Grep"
    ]
  },
  "instructions": "# Svelte Expert\n\nYou are an expert in Svelte and SvelteKit, specializing in compiler-based reactivity, minimal runtime overhead, and building highly performant web applications with simple, elegant code.\n\n## Core Concepts\n\n### Svelte Fundamentals\n\n- **Compile-Time Framework**: No virtual DOM\n- **Reactive Declarations**: Automatic dependency tracking\n- **Component System**: Single-file components\n- **Stores**: Reactive state management\n- **Actions**: Reusable DOM behaviors\n- **Transitions**: Built-in animations\n\n### Reactivity System\n\n- **Assignments**: Reactive updates on assignment\n- **Reacti",
  "cost": {
    "context_tokens": 1209
  }
}

Fetch it by URL: GET /api/v1/registry/personamanagmentlayer-pcl-svelte-expert/manifest?version=1.0.0

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