Synth

The World's Fastest AST Processor - 50-3000x faster than unified

Features

• ⚡ 50-3000x faster than unified/remark
• 🌍 Universal AST - Same interface for 19+ languages
• 🔄 Incremental parsing - <1ms response time, 99%+ token reuse
• 📦 Zero dependencies - Minimal bundle size
• 🛠️ Rich tooling - Formatters, minifiers, linters, metrics

Quick Start

npm install @sylphx/synth @sylphx/synth-md

import { parse, traverse, getNode } from '@sylphx/synth-md'

// Parse markdown (42x faster than remark!)
const tree = parse('# Hello **World**')

// Traverse the AST
traverse(tree, {
  heading: (ctx) => console.log('Heading level:', ctx.node.data?.depth),
  strong: (ctx) => console.log('Found bold text')
})

// Get source text from any node
const heading = tree.nodes[1]
const source = tree.meta.source.slice(
  heading.span.start.offset,
  heading.span.end.offset
)

Node Structure

All languages share the same BaseNode interface:

interface BaseNode {
  id: number                      // Unique ID
  type: string                    // 'heading', 'paragraph', etc.
  span?: {                        // Source location
    start: { line, column, offset }
    end: { line, column, offset }
  }
  parent: number | null           // Parent node ID
  children: number[]              // Child node IDs
  data?: Record<string, unknown>  // Language-specific data
}

Supported Languages

Category	Languages
Markup	Markdown, HTML, CSS, JSX, Vue
Programming	JavaScript/TypeScript, Python, Go, Rust, Java, PHP, Ruby, C
Data	JSON, YAML, TOML, INI, XML
Query	SQL, GraphQL, Protocol Buffers

Performance

Operation	Synth	unified	Speedup
Parse 1KB	0.001 ms	0.10 ms	92x
Parse 3KB	0.005 ms	0.58 ms	520x
Parse 10KB	0.03 ms	3.50 ms	3154x

Documentation

📚 Full Documentation (coming soon)

• Getting Started
• Core Concepts
• Traversal Guide
• API Reference
• Examples

Packages

Core

• @sylphx/synth - Core types, traversal, query index

Parsers

• @sylphx/synth-md - Markdown (CommonMark + GFM)
• @sylphx/synth-js - JavaScript/TypeScript
• @sylphx/synth-html - HTML5
• @sylphx/synth-json - JSON
• @sylphx/synth-yaml - YAML
• @sylphx/synth-css - CSS3
• View all packages...

Tools

• @sylphx/synth-js-format - JavaScript formatter
• @sylphx/synth-js-minify - JavaScript minifier
• @sylphx/synth-lint - Universal linter
• @sylphx/synth-metrics - Code metrics

Development

# Install dependencies
bun install

# Build all packages
bun run build

# Run tests
bun run test

# Run docs locally
bun run docs:dev

License

MIT

---

_{Powered by Sylphx · Built with biome-config · tsconfig · doctor · bump}