Modules

Split your code across files with import and export.

Creating a Module

src/math_utils.wyn:

export fn square(x: int) -> int {
    return x * x
}

export fn cube(x: int) -> int {
    return x * x * x
}

Importing

src/main.wyn:

import math_utils

fn main() -> int {
    println("5² = ${math_utils.square(5)}")
    println("3³ = ${math_utils.cube(3)}")
    return 0
}

Modules are resolved relative to the importing file's directory.

Selective Imports

import { square, cube } from math_utils

Exporting

Use export before any top-level declaration:

// Export functions
export fn add(a: int, b: int) -> int { return a + b }

// Export structs
export struct Point { x: float, y: float }

// Export enums
export enum Color { Red, Green, Blue }

// Export variables
export var VERSION = "1.0"

Project Structure

my-project/
├── wyn.toml
├── src/
│   ├── main.wyn        # entry point
│   ├── utils.wyn       # import utils
│   └── models.wyn      # import models
└── tests/
    └── test_main.wyn

Example: Multi-file App

src/utils.wyn:

export fn greet(name: string) -> string {
    return "Hello, ${name}!"
}

export fn square(x: int) -> int {
    return x * x
}

src/main.wyn:

import utils

fn main() -> int {
    println(utils.greet("World"))
    println("5² = ${utils.square(5)}")
    return 0
}