Branch info

There are two branches in this repo - main and multi. main branch serves an example of two separate WASM modules like add and sub which can be debugged separately. multi branch serves an example of an host application which loads two WASM modules like add and sub from WAT and tests a simple application graph with two WASM modules connected sequentially. It also contains two .wasm files (add.wasm and sub.wasm) from add.rs and sub.rs which are not used currently

Installation

1. Install Rust and wasmtime

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

curl https://wasmtime.dev/install.sh -sSf | bash

2. Set up target

rustup target add wasm32-wasip1

3. Compile add.rs and run

rustc --target=wasm32-wasip1 -O add.rs -o add.wasm
rustc --target=wasm32-wasip1 -O sub.rs -o sub.wasm
wasmtime add.wasm
wasmtime sub.wasm

4. Install wasm-pack for JS bindings

cargo install wasm-pack

5. Test the javascript code

fetch('wasm_add/target/wasm32-unknown-unknown/release/wasm_add.wasm')
  .then(response => response.arrayBuffer())
  .then(bytes => WebAssembly.instantiate(bytes))
  .then(({ instance }) => {
    console.log(instance.exports.add(5, 10)); // Output: 15
  });