npm and error messages

node_modules/core-js/modules/core.is-iterable.js

@@ -0,0 +1,10 @@
+var classof = require('./_classof');
+var ITERATOR = require('./_wks')('iterator');
+var Iterators = require('./_iterators');
+module.exports = require('./_core').isIterable = function (it) {
+  var O = Object(it);
+  return O[ITERATOR] !== undefined
+    || '@@iterator' in O
+    // eslint-disable-next-line no-prototype-builtins
+    || Iterators.hasOwnProperty(classof(O));
+};