1 files changed, 5 insertions, 0 deletions
diff --git a/node_modules/core-js/modules/_an-instance.js b/node_modules/core-js/modules/_an-instance.js
new file mode 100644
index 00000000..c0a5f920
--- /dev/null
+++ b/node_modules/core-js/modules/_an-instance.js
@@ -0,0 +1,5 @@
+module.exports = function (it, Constructor, name, forbiddenField) {
+  if (!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)) {
+    throw TypeError(name + ': incorrect invocation!');
+  } return it;
+};