Run `.wasm` from Node.js script

add.c

int add(int x, int y){
  return x + y * 2;
}

index.js

const { promisify } = require('util')
const fs = require('fs')
const path = require('path')
const readFile = promisify(fs.readFile)

readFile(path.join(__dirname, './add.wasm'))
  .then(WebAssembly.compile)
  .then((wasm) => new WebAssembly.Instance(wasm))
  .then((instance) => {
    console.log(instance.exports.add(1, 2))
  })

package.json

{
  "name": "simple",
  "version": "0.0.1",
  "scripts": {
    "build": "emcc ./add.c -o ./add.wasm --no-entry -s EXPORTED_FUNCTIONS=\"['_add']\"",
    "start": "node ./index.js"
  },
  "main": "index.js",
  "license": "MIT"
}