1.txt

node test.js --debug 1 --foo=2 --blerg
// { debug: '1', foo: '2', blerg: true }

test.js

'use strict'

function miniparse (argv) {
  argv = argv || process.argv
  const args = argv.splice(2).reduce((acc, el, i, src) => {

    const next = src[i + 1]
    if (/^--/.test(el) && next && !/^--/.test(next)) {
      el = el + '=' + next
      acc.push(el)
      return acc
    }

    if (/^--/.test(el)) {
      acc.push(el)
    }

   return acc
  }, []).reduce((acc, el) => {
    const cleaned = el.replace(/^--/, '').split('=')

    acc[cleaned[0]] = cleaned[1] || true
    return acc
  }, {})

  return args
}

console.log(miniparse())