Run external process from QuickJS

myAsynScript.js

import * as std from "std"
import * as os from "os"
import { open, close } from "process"

const CHUNK_SIZE = 200000 // 200KB

const fd = open('curl 2>/dev/null https://jsonplaceholder.typicode.com/users', 'r')

os.setReadHandler(fd, function() {
  let readBuf = new Uint8Array(CHUNK_SIZE)
  let l = os.read(fd, readBuf.buffer, 0, readBuf.length)

  if (!l) {
    std.out.printf("\n")
    
    os.setReadHandler(fd, null)
    close(fd)
  }

  let string = String.fromCharCode.apply(null, readBuf)
  std.out.printf("%s", string)
})

console.log('This line appears first, because the download runs asynchronously')