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diff --git a/node_modules/core-js/library/modules/_collection-to-json.js b/node_modules/core-js/library/modules/_collection-to-json.js
new file mode 100644
index 000000000..ce0282f6b
--- /dev/null
+++ b/node_modules/core-js/library/modules/_collection-to-json.js
@@ -0,0 +1,9 @@
+// https://github.com/DavidBruant/Map-Set.prototype.toJSON
+var classof = require('./_classof')
+  , from    = require('./_array-from-iterable');
+module.exports = function(NAME){
+  return function toJSON(){
+    if(classof(this) != NAME)throw TypeError(NAME + "#toJSON isn't generic");
+    return from(this);
+  };
+};
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