wasm-bindgen 0.2.127: 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 pkg:cargo/wasm-bindgen@0.2.127
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/wasm-bindgen@0.2.127
Demonstrate these symbols/APIs:
  - 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:sha256:0121521149c3c34b7fe96877035d766488ee8c9c5072d28bedc14b04f2ac18e2","contract":["wasm_bindgen annotates standalone exported functions callable with primitive arguments and return values","wasm_bindgen exports structs with constructors, methods, 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 pkg:cargo/wasm-bindgen@0.2.127","kind":"HOW","packages":["pkg:cargo/wasm-bindgen@0.2.127"],"schemaVersion":1,"symbols":["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@0.2.127"],"schemaVersion":1,"subject":"pkg:cargo/wasm-bindgen@0.2.127","symbols":["wasm_bindgen"],"verifierAdapter":"cargo@1"}

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  "kind": "HOW",
  "packages": [
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  ],
  "symbols": [
    "wasm_bindgen"
  ]
}

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

pub use wasm_bindgen::*;

use wasm_bindgen::prelude::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 constructors, methods, and mutators
#[wasm_bindgen]
pub struct Calculator {
    value: i32,
}

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

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

    pub fn add(&mut self, delta: i32) {
        self.value += delta;
    }
}

// 3. wasm_bindgen exports C-like enums with discriminants
#[wasm_bindgen]
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum OperationMode {
    Standard = 0,
    Advanced = 1,
    Custom = 2,
}

// 4. wasm_bindgen supports getter and setter methods on exported types
#[wasm_bindgen]
pub struct Settings {
    timeout_ms: u32,
}

#[wasm_bindgen]
impl Settings {
    #[wasm_bindgen(constructor)]
    pub fn new(timeout_ms: u32) -> Settings {
        Settings { timeout_ms }
    }

    #[wasm_bindgen(getter)]
    pub fn timeout_ms(&self) -> u32 {
        self.timeout_ms
    }

    #[wasm_bindgen(setter)]
    pub fn set_timeout_ms(&mut self, timeout_ms: u32) {
        self.timeout_ms = timeout_ms;
    }
}

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

#[wasm_bindgen]
pub fn calculate_checksum(data: &[u8]) -> usize {
    data.iter().map(|&x| x as usize).sum()
}

fn main() {
    // 1. Standalone function
    assert_eq!(add_numbers(20, 22), 42);

    // 2. Struct constructor and methods
    let mut calc = Calculator::new(10);
    assert_eq!(calc.value(), 10);
    calc.add(5);
    assert_eq!(calc.value(), 15);

    // 3. C-like enum discriminants
    let mode = OperationMode::Advanced;
    assert_eq!(mode as u32, 1);
    assert_ne!(OperationMode::Standard, OperationMode::Custom);

    // 4. Getter and setter methods
    let mut settings = Settings::new(3000);
    assert_eq!(settings.timeout_ms(), 3000);
    settings.set_timeout_ms(5000);
    assert_eq!(settings.timeout_ms(), 5000);

    // 5. String and slice operations
    assert_eq!(format_greeting("Rust"), "Hello, Rust!");
    let sample_bytes = [10u8, 20, 30];
    assert_eq!(calculate_checksum(&sample_bytes), 60);

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