JS: Sandbox Pattern

sandbox.js

Sandbox.modules = {}

Sandbox.modules.vnode = function(s) {
  s.vnode = {}
}

Sandbox.modules.createElement = function(s) {
  s.createElement = function() {}
}

function Sandbox() {
  const args = Array.prototype.slice.call(arguments)
  let callback = args.pop()
  let modules = args[0] && typeof args[0] === 'string' ? args : args[0]

  function ownProperty(prop) {
    return Sandbox.modules.hasOwnProperty(prop)
  }

  if (!this instanceof Sandbox) {
    return new Sandbox(modules, callback)
  }

  if (!modules || modules[0] === '*') {
    modules = []

    for (let i in Sandbox.modules) {
      if (ownProperty(i)) {
        modules.push(i)
      }
    }
  }

  for (let i in modules) {
    if (ownProperty(modules[i])) {
      Sandbox.modules[modules[i]](this)
    }
  }

  callback && callback(this)
}

new Sandbox(['*'], function($scope) {
  console.log($scope) // -> Sandbox {vnode: {…}, createElement: ƒ}createElement: ƒ ()vnode: {}__proto__: Object}
})

new Sandbox(['createElement'], function($scope) {
  console.log($scope) // -> Sandbox {createElement: ƒ}createElement: ƒ ()vnode: {}__proto__: Object}
})