Modules

You can use export and import to create modules in your project.

math.ngn

export fn add(a, b) a + b

export fn subtract(a, b) a - b

Here, we look for an add function from a math.ngn file within the same directory that your main.ngn file is in.

main.ngn

import { add } from "math.ngn"

fn main() {
  print(add(21, 3)) // 24
}

Relative path imports

import { add } from "./lib/math.ngn"

Aliased imports

import { add as adder } from "math.ngn"

Module imports

main.ngn

import * as Math from "math.ngn"

print(Math.subtract(10, 2)) // 5

Default export

math.ngn

fn add(a, b) a + b

export default add

main.ngn

import add from "math.ngn"

Exporting types and models

types.ngn

export type UserId = i64

export model User {
  id: UserId,
  name: string
}

Exporting roles and enums

domain.ngn

export role Named {
  fn name(): string
}

export enum Status {
  Active,
  Disabled,
  Error(string),
}

main.ngn

import { Named, Status } from "domain.ngn"

fn describe(status: Status): string {
  match status {
    Status::Active => "active"
    Status::Disabled => "disabled"
    Status::Error(message) => "error: ${message}"
  }
}

main.ngn

import { User, UserId } from "types.ngn"

fn format_id(id: UserId): string {
  return "id=${id}"
}

fn main() {
  const user = User { id: 7, name: "Ari" }
  print(format_id(user.id))
}