e-lado/node_modules0/core-js/modules/$.keyof.js

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var $         = require('./$')
  , toIObject = require('./$.to-iobject');
module.exports = function(object, el){
  var O      = toIObject(object)
    , keys   = $.getKeys(O)
    , length = keys.length
    , index  = 0
    , key;
  while(length > index)if(O[key = keys[index++]] === el)return key;
};