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Instant syntax validation without CLI calls or heavy dependencies.\n\n## šŸŽÆ Why Merval?\n\nTired of installing `@mermaid-js/mermaid-cli` and its 400+ dependencies (Puppeteer, Chromium, etc.) just to validate a simple diagram? **Merval** gives you instant Mermaid syntax validation with zero dependencies.\n\n- āš” **Instant**: No CLI calls, no external processes\n- šŸŖ¶ **Zero Dependencies**: Pure JavaScript, no Puppeteer, no Chromium\n- šŸŽÆ **100% Compatible**: Tested against Mermaid CLI v11.12.0\n- šŸš€ **Lightning Fast**: Direct parsing, no rendering overhead\n- šŸ›”ļø **Type Safe**: Built with TypeScript for robust validation\n\n## Supported Diagram Types\n\n- [x] Flowchart (graph/flowchart)\n- [x] Sequence Diagram\n- [x] Class Diagram\n- [x] State Diagram\n- [x] Entity Relationship Diagram\n- [x] User Journey\n- [x] Gantt Chart\n- [x] Pie Chart\n- [x] Gitgraph\n- [x] Mindmap\n- [x] Timeline\n- [x] xychart-beta (bar/line charts)\n- [x] block-beta (block diagrams)\n\n## šŸ“¦ Installation\n\n```bash\n# Using npm\nnpm install @aj-archipelago/merval\n\n# Using yarn \nyarn add @aj-archipelago/merval\n\n# Using pnpm\npnpm add @aj-archipelago/merval\n```\n\n## šŸš€ Quick Start\n\n```javascript\nimport { validateMermaid } from '@aj-archipelago/merval';\n\n// Instant validation - no CLI, no dependencies!\nconst result = validateMermaid(`\ngraph TD\n A[Start] --> B{Decision}\n B -->|Yes| C[Process A]\n B -->|No| D[Process B]\n C --> E[End]\n D --> E[End]\n`);\n\nconsole.log(result.isValid); // true/false\nconsole.log(result.diagramType); // 'flowchart'\nconsole.log(result.errors); // [] or array of error objects\n```\n\n## Mermaid Version Compatibility\n\nThis validator is tested against **Mermaid CLI v11.12.0** to ensure 100% compatibility. The library tracks which version it was validated against and can warn about potential compatibility issues.\n\n### Version Information\n\n```javascript\nimport { getMermaidVersionInfo, isMermaidVersionSupported } from '@aj-archipelago/merval';\n\n// Get version compatibility info\nconst versionInfo = getMermaidVersionInfo();\nconsole.log(versionInfo);\n// {\n// validatedAgainst: \"11.12.0\",\n// lastValidated: \"2024-10-15\", \n// cliVersion: \"@mermaid-js/mermaid-cli@11.12.0\"\n// }\n\n// Check if a specific version is supported\nconsole.log(isMermaidVersionSupported(\"11.12.0\")); // true\nconsole.log(isMermaidVersionSupported(\"12.0.0\")); // false\n```\n\n### Version-Aware Validation\n\n```javascript\nimport { validateMermaid } from '@aj-archipelago/merval';\n\n// Basic validation (no version check)\nconst result = validateMermaid(mermaidCode);\n\n// Validate with version compatibility check\nconst result = validateMermaid(mermaidCode, \"12.0.0\");\nif (!result.isValid && result.errors.some(e => e.code === 'VERSION_MISMATCH')) {\n console.log('Warning: This validator was not tested against Mermaid 12.0.0');\n}\n```\n\n### Updating Mermaid Version Compatibility\n\nWhen updating this validator to work with a new Mermaid version, use the provided script:\n\n```bash\n# Update to a new Mermaid version\nnpm run update-version 12.0.0 2024-11-01\n\n# Or manually run the script\nnode scripts/update-version.js 12.0.0 2024-11-01\n```\n\nThis script will:\n1. Update `package.json` with the new version info\n2. Update `src/version.ts` with the new version constants\n3. Build the project\n4. Run all tests\n5. Provide next steps for full compatibility testing\n\n## API\n\n```javascript\nimport { validateMermaid, isValidMermaid, getDiagramType } from '@aj-archipelago/merval';\n\n// Basic validation\nconst result = validateMermaid(`\ngraph TD\n A[Start] --> B{Decision}\n B -->|Yes| C[Process A]\n B -->|No| D[Process B]\n C --> E[End]\n D --> E[End]\n`);\n\nconsole.log(result.isValid); // true/false\nconsole.log(result.diagramType); // 'flowchart'\nconsole.log(result.errors); // [] or array of error objects\n\n// Simple boolean validation\nconst isValid = isValidMermaid(mermaidCode); // true/false\n\n// Get diagram type only\nconst diagramType = getDiagramType(mermaidCode); // 'flowchart', 'sequence', etc.\n\n// Validation with version compatibility check\nconst result = validateMermaid(mermaidCode, \"12.0.0\");\nif (!result.isValid && result.errors.some(e => e.code === 'VERSION_MISMATCH')) {\n console.log('Version compatibility warning');\n}\n```\n\n## Error Format\n\n```javascript\n{\n isValid: false,\n diagramType: 'flowchart',\n errors: [\n {\n line: 2,\n column: 15,\n message: \"Missing arrow between nodes\",\n code: \"MISSING_ARROW\",\n suggestion: \"Add '-->' to connect nodes\"\n }\n ]\n}\n```\n\n## šŸ’” Why Merval?\n\n### The Problem with Traditional Mermaid Validation\n\n```bash\n# Traditional approach - heavy dependencies\nnpm install @mermaid-js/mermaid-cli\n# Installs 400+ packages including:\n# - puppeteer (Chromium browser)\n# - canvas, cairo, pango, etc.\n# - Native dependencies requiring compilation\n```\n\n### The Merval Solution\n\n```bash\n# Merval - zero dependencies\nnpm install merval\n# Installs only merval - that's it!\n```\n\n**Merval** gives you the same validation accuracy as Mermaid CLI but with:\n- **Zero dependencies** - no Puppeteer, no Chromium, no native compilation\n- **Instant validation** - no CLI process spawning, no file I/O\n- **Same accuracy** - 100% compatible with Mermaid CLI v11.12.0\n- **TypeScript support** - full type safety out of the box\n\n## Implementation Strategy\n\n1. **Lexical Analysis**: Tokenize input into meaningful components\n2. **Syntax Analysis**: Build AST and validate structure\n3. **Semantic Validation**: Check relationships and references\n4. **Diagram-Specific Rules**: Each type has unique validation\n\n## Architecture\n\n```\nsrc/\nā”œā”€ā”€ lexer.js # Tokenize input\nā”œā”€ā”€ parser.js # Parse tokens into AST\nā”œā”€ā”€ validators/\nā”‚ ā”œā”€ā”€ flowchart.js # Flowchart-specific validation\nā”‚ ā”œā”€ā”€ sequence.js # Sequence diagram validation\nā”‚ ā”œā”€ā”€ xychart.js # xychart-beta validation\nā”‚ ā””ā”€ā”€ ...\nā”œā”€ā”€ ast/ # AST node definitions\nā””ā”€ā”€ index.js # Main API\n```\n\n## License\n\nMIT - Compatible with Mermaid.js MIT license\n\n---\n\n
Built with šŸ’– by diagram enthusiasts for diagram enthusiasts.
\n","readmeFilename":"README.md"}