npm and error messages

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

@@ -0,0 +1,12 @@
+// 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;
+  }
+};