A TypeScript-inspired transpiler for writing Clarity smart contracts on the Stacks blockchain.

Write contracts with familiar syntax. Get valid, optimized Clarity output.

Quick Start

# Install
pip install stxscript

# Transpile a contract
stxscript build contract.stx contract.clar

# Create a new project
stxscript new my-token --template token

Overview

StxScript provides a multi-stage transpilation pipeline:

1. Parsing - Lark-based LALR grammar
2. AST Generation - Typed abstract syntax tree
3. Semantic Analysis - Type checking, scope validation, trait compliance
4. Code Generation - Optimized Clarity output

Language Example

StxScript input:

const TOKEN_NAME: string = "MyToken";
const MAX_SUPPLY: uint = 1000000u;

let total_supply: uint = 0u;
map balances<principal, uint>;

@public
function mint(amount: uint): Response<bool, uint> {
    if (total_supply + amount > MAX_SUPPLY) {
        return err(1u);
    }
    total_supply = total_supply + amount;
    return ok(true);
}

@readonly
function get_balance(account: principal): uint {
    match balances.get(account) {
        some(balance) => balance,
        none => 0u
    }
}

Clarity output:

(define-constant TOKEN_NAME u"MyToken")
(define-constant MAX_SUPPLY u1000000)
(define-data-var total_supply uint u0)
(define-map balances principal uint)

(define-public (mint (amount uint))
  (if (> (+ (var-get total_supply) amount) MAX_SUPPLY)
    (err u1)
    (begin
      (var-set total_supply (+ (var-get total_supply) amount))
      (ok true))))

(define-read-only (get-balance (account principal))
  (default-to u0 (map-get? balances account)))

Language Features

• Variables and constants with let and const
• Functions with @public, @readonly decorators
• Type system - int, uint, bool, string, principal, buffer, Optional, Response, List, Map, tuples
• Type aliases and generics - type Amount = uint;, function identity<T>(x: T): T
• Control flow - if/else, match expressions, for loops, while loops
• Lambda expressions - (x: uint) => x * 2u
• Traits and interfaces - trait definitions and @implements contracts
• Maps - declaration and get/set/delete operations
• Error handling - Response types, unwrap (!), default (??), try!
• Imports - module system with contract calls
• Bitwise operations - &, |, ^, ~, <<, >>

CLI Commands

Python API

from stxscript import StxScriptTranspiler

transpiler = StxScriptTranspiler()

# Basic transpilation
clarity = transpiler.transpile('let balance: uint = 1000u;')
print(clarity)  # (define-data-var balance uint u1000)

# With error handling
result = transpiler.transpile_with_error_handling(code)
if result['success']:
    print(result['code'])
else:
    print(result['errors'])

IDE Support

• VS Code Extension - syntax highlighting, snippets, integrated LSP
• LSP Server - diagnostics, autocomplete, hover info, go-to-definition
• Vim/Neovim, Sublime, Emacs - LSP client configuration available

Run the language server:

Documentation

Full documentation is available in the documentation/ directory, built with mkdocs-material:

# Serve docs locally
cd documentation && mkdocs serve

• Getting Started - Installation and first contract
• Language Guide - Complete language reference
• CLI Reference - All CLI commands
• Examples - Real-world contract examples
• Testing - Contract testing framework
• API Reference - Python API
• IDE Setup - VS Code extension and LSP
• Contributing - How to contribute

Development

Setup

git clone https://github.com/cryptuon/stxscript.git
cd stxscript
uv venv && uv pip install -e ".[dev]"

Testing

# Run all tests
uv run python -m pytest tests/

# Run with coverage
uv run python -m pytest tests/ --cov=stxscript

# Run specific test file
uv run python -m pytest tests/test_transpiler.py -v

Code Quality

uv run black stxscript/
uv run flake8 stxscript/
uv run mypy stxscript/

Building Documentation

cd documentation
uv run mkdocs build    # Build static site
uv run mkdocs serve    # Local dev server at http://127.0.0.1:8000

Contributing

1. Fork the repository
2. Create a feature branch: git checkout -b feature/my-feature
3. Make changes and add tests
4. Run the test suite: uv run python -m pytest tests/
5. Submit a pull request

See Contributing Guide for details.

License

MIT License. See LICENSE for details.

Links

• GitHub Repository
• Issue Tracker
• Stacks Blockchain
• Clarity Language