Minimal Rust-Node.js example using wasm-bindgen and TypeScript.

make setup
make build
make test

import { add, Calculator } from 'nodejs-rust-mvp';

// Add two numbers
add(5, 10); // 15

// Use Calculator
const calc = new Calculator(5);
calc.value; // 5
calc.add(10); // 15

To run a simple example that demonstrates the functionality and performance:

make example

Here's a quick demonstration of the development workflow with Rust and WebAssembly integration:

1. First, add the web-sys dependency for console logging capabilities:

   # Via CLI
   cargo add web-sys --features console

   # Or in Cargo.toml
   # [dependencies]
   # web-sys = { version = "0.3", features = ["console"] }

2. Add a debug print statement to the Rust code:

   diff --git a/src/lib.rs b/src/lib.rs
   --- a/src/lib.rs
   +++ b/src/lib.rs
   @@ -3,6 +3,7 @@ use wasm_bindgen::prelude::*;
   
    // Export a simple add function to JavaScript
    #[wasm_bindgen]
    pub fn add(a: i32, b: i32) -> i32 {
   +    web_sys::console::log_1(&format!("🦀 FROM RUST: Adding {} + {}", a, b).into());
        a + b
    }

3. Rebuild and run tests with console output visible:

   make rebuild; RUST_BACKTRACE=1 yarn test

4. See the Rust console logs in your test output:

   ======= RUNS =======
   ✓ src/index.test.ts (5 tests)
   
   🦀 FROM RUST: Adding 2 + 3
   🦀 FROM RUST: Adding 5 + 5
   
   ======= PASS =======
   

This demonstrates how you can debug Rust code using web_sys::console::log_1 to output messages to the JavaScript console when working with WebAssembly.

• Node.js 18+
• Rust (latest stable)
• wasm-pack

• python-rust-mvp - A companion project showing Rust integration with Python using PyO3

This project is licensed under the MIT License - see the LICENSE file for details.