node_modules/jszip/node_modules/core-js/library/modules/_iter-call.js

// call something on iterator step with safe closing on error
var anObject = require('./_an-object');
module.exports = function(iterator, fn, value, entries){
  try {
    return entries ? fn(anObject(value)[0], value[1]) : fn(value);
  // 7.4.6 IteratorClose(iterator, completion)
  } catch(e){
    var ret = iterator['return'];
    if(ret !== undefined)anObject(ret.call(iterator));
    throw e;
  }
};