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1 files changed, 53 insertions, 0 deletions

diff --git a/node_modules/core-js/modules/_meta.js b/node_modules/core-js/modules/_meta.js
new file mode 100644
index 00000000..2d4b3257
--- /dev/null
+++ b/node_modules/core-js/modules/_meta.js
@@ -0,0 +1,53 @@
+var META = require('./_uid')('meta');
+var isObject = require('./_is-object');
+var has = require('./_has');
+var setDesc = require('./_object-dp').f;
+var id = 0;
+var isExtensible = Object.isExtensible || function () {
+  return true;
+};
+var FREEZE = !require('./_fails')(function () {
+  return isExtensible(Object.preventExtensions({}));
+});
+var setMeta = function (it) {
+  setDesc(it, META, { value: {
+    i: 'O' + ++id, // object ID
+    w: {}          // weak collections IDs
+  } });
+};
+var fastKey = function (it, create) {
+  // return primitive with prefix
+  if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
+  if (!has(it, META)) {
+    // can't set metadata to uncaught frozen object
+    if (!isExtensible(it)) return 'F';
+    // not necessary to add metadata
+    if (!create) return 'E';
+    // add missing metadata
+    setMeta(it);
+  // return object ID
+  } return it[META].i;
+};
+var getWeak = function (it, create) {
+  if (!has(it, META)) {
+    // can't set metadata to uncaught frozen object
+    if (!isExtensible(it)) return true;
+    // not necessary to add metadata
+    if (!create) return false;
+    // add missing metadata
+    setMeta(it);
+  // return hash weak collections IDs
+  } return it[META].w;
+};
+// add metadata on freeze-family methods calling
+var onFreeze = function (it) {
+  if (FREEZE && meta.NEED && isExtensible(it) && !has(it, META)) setMeta(it);
+  return it;
+};
+var meta = module.exports = {
+  KEY: META,
+  NEED: false,
+  fastKey: fastKey,
+  getWeak: getWeak,
+  onFreeze: onFreeze
+};