How to use the locutus.extractTargetObj function in locutus

module.exports = function extract (arr, type, prefix)  {
  // From: http://locutusjs.org/php
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %        note 1: Only works by extracting into global context (whether called in the global scope or
  // %        note 1: within a function); also, the EXTR_REFS flag I believe can't be made to work
  // *     example 1: size = 'large';
  // *     example 1: var_array = {'color' : 'blue', 'size' : 'medium', 'shape' : 'sphere'};
  // *     example 1: extract(var_array, 'EXTR_PREFIX_SAME', 'wddx');
  // *     example 1: color+'-'+size+'-'+shape+'-'+wddx_size;
  // *     returns 1: 'blue-large-sphere-medium'
  if (Object.prototype.toString.call(arr) === '[object Array]' &&
      (type !== 'EXTR_PREFIX_ALL' && type !== 'EXTR_PREFIX_INVALID')) {
    return 0;
  }
  var targetObj = this.window;
  if (this.php_js && this.php_js.ini && this.php_js.ini['locutus.extractTargetObj'] && this.php_js.ini['locutus.extractTargetObj'].local_value) { // Allow designated object to be used instead of window
    targetObj = this.php_js.ini['locutus.extractTargetObj'].local_value;
  }
  var chng = 0;

  for (var i in arr) {
    var validIdent = /^[_a-zA-Z$][\w|$]*$/; // TODO: Refine regexp to allow JS 1.5+ Unicode identifiers
    var prefixed = prefix + '_' + i;
    try {
      switch (type) {
        case 'EXTR_PREFIX_SAME' || 2:
          if (targetObj[i] !== undefined) {
            if (prefixed.match(validIdent) !== null) {
              targetObj[prefixed] = arr[i];
              ++chng;
            }
          } else {