newbox-eval/index.js

A Safe Eval But With Variable Saving

/* NewBox Alpha 0.1 Do Not Copy!
Copyright NiceJSProgrammer® 2020
*/

var vm = require('vm')
var sandbox = {logC: function(ll){console.log(ll)}}
vm.createContext(sandbox);

module.exports = function boxEval (code, context, opts) {


  var resultKey = 'NEW_BOX_EVAL'
  sandbox[resultKey] = {}
  var clearContext = `
    (function(){
      const keys = Object.getOwnPropertyNames(this).concat(['constructor']);
	  keys.forEach((key) => {
        const item = this[key];
        if(!item || typeof item.constructor !== 'function') return;
        this[key].constructor = undefined;
      });
    })();
  `
  code = clearContext + resultKey + '=' + code
  if (context) {
    Object.keys(context).forEach(function (key) {
      sandbox[key] = context[key]
    })
  }
  vm.runInContext(code, sandbox, opts)
  return sandbox[resultKey]
}