Skir is a universal language for representing data types, constants, and RPC interfaces. Define your schema once in a .skir file and generate idiomatic, type-safe code in TypeScript, Python, Java, C++, and more.

✨ Features

- 💎 Single source of truth - Define your data types and APIs once and share them between your backend, frontend, and microservices.
- 🌍 Multi-language - First-class support for TypeScript, Python, C++, Java, Kotlin, and Dart.
- ✍️ Idiomatic code gen - Generates code that feels native to each language.
- 🍃 Effortless serialization - Skir generates functions to serialize your data to JSON or binary, so you never have to write parsing code manually.
- 🦋 Schema evolution - Simple guidelines and built-in checks to evolve your schema without breaking backward compatibility.
- 🤝 RPCs with end-to-end type safety - Like tRPC, but for every language. Call your backend functions directly from your frontend or microservices with full compile-time safety.
- 🛠️ Delightful developer experience - Automatic recompilation in watch mode, built-in code formatter, official VSCode extension.
- 📦 Built-in package manager - Import types from other GitHub repositories to easily share common data structures across projects.
- 🍃 Easy setup - Get started with npx skir init, manage your entire project configuration from a single YAML file.

⚡ Syntax example

``d
// shapes.skir

struct Point {
x: int32;
y: int32;
label: string;
}

struct Shape {
points: [Point];
/// A short string describing this shape.
label: string;
}

const TOP_RIGHT_CORNER: Point = {
x = 600,
y = 400,
label = "top-right corner",
};

/// Returns true if no part of the shape's boundary curves inward.
method IsConvex(Shape): bool = 12345;
`

Skir compiles these definitions into native, type-safe code you can use in your project:

`python


my_project.py

from skirout.shapes_skir import Point # Python module generated by Skir

point = Point(x=3, y=4, label="P")

Round–trip serialization to JSON

assert(restored == point)
``

📚 Documentation

- Getting started: setup & workflow
- Language reference
- Serialization
- Schema evolution
- RPC services
- External dependencies
- Coming from Protocol Buffer

🌍 Supported languages

| Language | Documentation | Example |
| :--- | :--- | :--- |
| 🟦 TypeScript | Documentation | Example |
| 🐍 Python | Documentation | Example |
| ⚡ C++ | Documentation | Example |
| ☕ Java | Documentation | Example |
| 💜 Kotlin | Documentation | Example |
| 🎯 Dart | Documentation | Example |