Move internal modules to “internal” folder.

.internal/baseShuffle.js

@@ -0,0 +1,15 @@
+import shuffleSelf from './.internal/shuffleSelf.js';
+import values from './values.js';
+
+/**
+ * The base implementation of `shuffle`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+function baseShuffle(collection) {
+  return shuffleSelf(values(collection));
+}
+
+export default baseShuffle;