python2ts

AST-based Python to TypeScript transpiler — Write Python, ship TypeScript.

Convert Python code to clean, idiomatic TypeScript with full type preservation.

Quick Start

npm install python2ts

# Transpile a file
npx python2ts input.py -o output.ts

# Pipe from stdin
cat script.py | npx python2ts > script.ts

Example

def fibonacci(n: int) -> list[int]:
    a, b = 0, 1
    result = []
    for _ in range(n):
        result.append(a)
        a, b = b, a + b
    return result

Becomes:

import { range } from "pythonlib"

function fibonacci(n: number): number[] {
  let [a, b] = [0, 1]
  let result: number[] = []
  for (const _ of range(n)) {
    result.push(a)
    ;[a, b] = [b, a + b]
  }
  return result
}

Documentation

📚 View Full Documentation

Runtime Support

Tested on every commit: Node.js (v22, v24) · Bun · Deno · Browsers

Related

• pythonlib — Python standard library for TypeScript
• GitHub — Source code and issue tracker

License

MIT © Sebastian Software GmbH