node_modules/jszip/node_modules/core-js/library/modules/es7.reflect.get-metadata-keys.js

var Set                     = require('./es6.set')
  , from                    = require('./_array-from-iterable')
  , metadata                = require('./_metadata')
  , anObject                = require('./_an-object')
  , getPrototypeOf          = require('./_object-gpo')
  , ordinaryOwnMetadataKeys = metadata.keys
  , toMetaKey               = metadata.key;

var ordinaryMetadataKeys = function(O, P){
  var oKeys  = ordinaryOwnMetadataKeys(O, P)
    , parent = getPrototypeOf(O);
  if(parent === null)return oKeys;
  var pKeys  = ordinaryMetadataKeys(parent, P);
  return pKeys.length ? oKeys.length ? from(new Set(oKeys.concat(pKeys))) : pKeys : oKeys;
};

metadata.exp({getMetadataKeys: function getMetadataKeys(target /*, targetKey */){
  return ordinaryMetadataKeys(anObject(target), arguments.length < 2 ? undefined : toMetaKey(arguments[1]));
}});