class_basic.affine

// SPDX-License-Identifier: PMPL-1.0-or-later
// issue #122 Phase 1 regression: Deno-ESM backend.
//
// Exercises: struct + receiver-first free fns -> `export class` (the
// current grammar accepts neither inherent `impl` nor a `self`
// expression, so methods are free functions taking the struct first);
// constructor synthesis from a struct-returning fn; cross-method calls
// (`Counter_*` -> `this.*`); `extern fn` lowering (jsonStringify ->
// JSON.stringify); `pub fn`/`pub const`/`pub enum` -> `export`.
//
// Pure logic only (no FS / print), so it runs under plain Node ESM —
// CI has Node 20 but no Deno.

pub extern fn jsonStringify(v: Int) -> String;

struct Counter { start: Int }

pub fn Counter_new(start: Int) -> Counter = Counter #{ start: start };

pub fn Counter_bumped(c: Counter, by: Int) -> Int = c.start + by;

pub fn Counter_bumpedTwice(c: Counter, by: Int) -> Int =
  Counter_bumped(c, by) + by;

pub fn Counter_encodedStart(c: Counter) -> String = jsonStringify(c.start);

pub fn double(x: Int) -> Int = x * 2;

pub const ANSWER: Int = 42;

pub enum Color { Red, Green, Blue }