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---
name: ck:mermaidjs-v11
description: Create diagrams with Mermaid.js v11 syntax. Use for flowcharts, sequence diagrams, class diagrams, ER diagrams, Gantt charts, state diagrams, architecture diagrams, timelines, user journeys.
argument-hint: "[diagram-type or description]"
metadata:
author: claudekit
version: "1.0.0"
---
# Mermaid.js v11
## Overview
Create text-based diagrams using Mermaid.js v11 declarative syntax. Convert code to SVG/PNG/PDF via CLI or render in browsers/markdown files.
## Quick Start
**Basic Diagram Structure:**
```
{diagram-type}
{diagram-content}
```
**Common Diagram Types:**
- `flowchart` - Process flows, decision trees
- `sequenceDiagram` - Actor interactions, API flows
- `classDiagram` - OOP structures, data models
- `stateDiagram` - State machines, workflows
- `erDiagram` - Database relationships
- `gantt` - Project timelines
- `journey` - User experience flows
See `references/diagram-types.md` for all 24+ types with syntax.
## Creating Diagrams
**Inline Markdown Code Blocks:**
````markdown
```mermaid
flowchart TD
A[Start] --> B{Decision}
B -->|Yes| C[Action]
B -->|No| D[End]
```
````
**Configuration via Frontmatter:**
````markdown
```mermaid
---
theme: dark
---
flowchart LR
A --> B
```
````
**Comments:** Use `%% ` prefix for single-line comments.
## CLI Usage
Convert `.mmd` files to images:
```bash
# Installation
npm install -g @mermaid-js/mermaid-cli
# Basic conversion
mmdc -i diagram.mmd -o diagram.svg
# With theme and background
mmdc -i input.mmd -o output.png -t dark -b transparent
# Custom styling
mmdc -i diagram.mmd --cssFile style.css -o output.svg
```
See `references/cli-usage.md` for Docker, batch processing, and advanced workflows.
## JavaScript Integration
**HTML Embedding:**
```html
<pre class="mermaid">
flowchart TD
A[Client] --> B[Server]
</pre>
<script src="https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js"></script>
<script>mermaid.initialize({ startOnLoad: true });</script>
```
See `references/integration.md` for Node.js API and advanced integration patterns.
## Configuration & Theming
**Common Options:**
- `theme`: "default", "dark", "forest", "neutral", "base"
- `look`: "classic", "handDrawn"
- `fontFamily`: Custom font specification
- `securityLevel`: "strict", "loose", "antiscript"
See `references/configuration.md` for complete config options, theming, and customization.
## Practical Patterns
Load `references/examples.md` for:
- Architecture diagrams
- API documentation flows
- Database schemas
- Project timelines
- State machines
- User journey maps
## Resources
- `references/diagram-types.md` - Syntax for all 24+ diagram types
- `references/configuration.md` - Config, theming, accessibility
- `references/cli-usage.md` - CLI commands and workflows
- `references/integration.md` - JavaScript API and embedding
- `references/examples.md` - Practical patterns and use cases