Compile Zig to WebAssembly and run it in Node.js

index.js

const fs = require("fs");

const content = fs.readFileSync("./test.wasm");

WebAssembly.compile(content)
  .then(module => {
    const imports = {
      env: {
        memoryBase: 0,
        tableBase: 0,
        memory: new WebAssembly.Memory({ initial: 256 }),
        table: new WebAssembly.Table({ initial: 0, element: "anyfunc" })
      }
    };

    const instance = new WebAssembly.Instance(module, imports);
    
    console.log(instance.exports.addInc(1, 2));
  })
  .catch(e => {
    console.error(e);
  });

Makefile

build:
	zig build-exe --name test.wasm -target wasm32-freestanding --release-small test.zig

test.zig

export fn addInc(a: i32, b: i32) i32 {
    return a + b;
}