wasm-bindgen-macro 0.2.127: wasm_bindgen_macro::wasm_bindgen

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify wasm_bindgen_macro::wasm_bindgen in pkg:cargo/wasm-bindgen-macro@0.2.127
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/wasm-bindgen-macro@0.2.127
Demonstrate these symbols/APIs:
  - wasm_bindgen_macro::wasm_bindgen

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:bcaa94d95d54fb7a7ffb9ff498b3e9ff61f3f4103eb9f42894643c97263e647a","contract":["wasm_bindgen annotates standalone exported functions callable with primitive arguments and return values","wasm_bindgen exports structs with methods, constructors, and mutators","wasm_bindgen exports C-like enums with discriminants","wasm_bindgen supports getter and setter methods on exported types","wasm_bindgen processes functions operating on strings and byte slices"],"goal":"verify wasm_bindgen_macro::wasm_bindgen in pkg:cargo/wasm-bindgen-macro@0.2.127","kind":"HOW","packages":["pkg:cargo/wasm-bindgen-macro@0.2.127"],"schemaVersion":1,"symbols":["wasm_bindgen_macro::wasm_bindgen"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/wasm-bindgen-macro@0.2.127"],"schemaVersion":1,"subject":"pkg:cargo/wasm-bindgen-macro@0.2.127","symbols":["wasm_bindgen_macro::wasm_bindgen"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify wasm_bindgen_macro::wasm_bindgen in pkg:cargo/wasm-bindgen-macro@0.2.127",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/wasm-bindgen-macro@0.2.127"
  ],
  "symbols": [
    "wasm_bindgen_macro::wasm_bindgen"
  ]
}

//! Clean-room verification sample for wasm-bindgen-macro.

pub use wasm_bindgen_macro::*;

use wasm_bindgen_macro::wasm_bindgen;

// 1. wasm_bindgen annotates standalone exported functions callable with primitive arguments and return values
#[wasm_bindgen]
pub fn add_numbers(a: i32, b: i32) -> i32 {
    a + b
}

// 2. wasm_bindgen exports structs with methods, constructors, and mutators
#[wasm_bindgen]
pub struct Counter {
    val: i32,
}

#[wasm_bindgen]
impl Counter {
    #[wasm_bindgen(constructor)]
    pub fn new(initial: i32) -> Counter {
        Counter { val: initial }
    }

    pub fn value(&self) -> i32 {
        self.val
    }

    pub fn increment(&mut self) {
        self.val += 1;
    }
}

// 3. wasm_bindgen exports C-like enums with discriminants
#[wasm_bindgen]
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum Status {
    Inactive = 0,
    Active = 1,
    Pending = 2,
}

// 4. wasm_bindgen supports getter and setter methods on exported types
#[wasm_bindgen]
pub struct Config {
    port: u16,
}

#[wasm_bindgen]
impl Config {
    #[wasm_bindgen(constructor)]
    pub fn new(port: u16) -> Config {
        Config { port }
    }

    #[wasm_bindgen(getter)]
    pub fn port(&self) -> u16 {
        self.port
    }

    #[wasm_bindgen(setter)]
    pub fn set_port(&mut self, port: u16) {
        self.port = port;
    }
}

// 5. wasm_bindgen processes functions operating on strings and byte slices
#[wasm_bindgen]
pub fn greet(name: &str) -> String {
    format!("Hello, {name}!")
}

#[wasm_bindgen]
pub fn byte_len(data: &[u8]) -> usize {
    data.len()
}

fn main() {
    // 1. Standalone function with primitive arguments and return value
    assert_eq!(add_numbers(17, 25), 42);

    // 2. Struct constructor and methods
    let mut counter = Counter::new(100);
    assert_eq!(counter.value(), 100);
    counter.increment();
    assert_eq!(counter.value(), 101);

    // 3. C-like enum discriminants
    let s_active = Status::Active;
    assert_eq!(s_active as u32, 1);
    let s_pending = Status::Pending;
    assert_eq!(s_pending as u32, 2);
    assert_ne!(s_active, s_pending);

    // 4. Getter and setter methods
    let mut config = Config::new(8080);
    assert_eq!(config.port(), 8080);
    config.set_port(9090);
    assert_eq!(config.port(), 9090);

    // 5. String and byte slice operations
    let greeting = greet("CodeSampleX");
    assert_eq!(greeting, "Hello, CodeSampleX!");
    let data = [1u8, 2, 3, 4, 5];
    assert_eq!(byte_len(&data), 5);

    println!("All wasm_bindgen_macro contract assertions passed successfully.");
}