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app/code/node_modules/collect.js/docs/api/duplicates.md

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+# `duplicates()`
+
+The duplicates method retrieves and returns duplicate values from the collection:
+
+```js
+const collection = collect(['a', 'b', 'a', 'c', 'b']);
+
+const duplicates = collection.duplicates();
+
+duplicates.all();
+
+// { 2: 'a', 4: 'b' }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/duplicates.js)