Move internal modules to “internal” folder.

.internal/getWrapDetails.js

@@ -0,0 +1,17 @@
+/** Used to match wrap detail comments. */
+const reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/;
+const reSplitDetails = /,? & /;
+
+/**
+ * Extracts wrapper details from the `source` body comment.
+ *
+ * @private
+ * @param {string} source The source to inspect.
+ * @returns {Array} Returns the wrapper details.
+ */
+function getWrapDetails(source) {
+  const match = source.match(reWrapDetails);
+  return match ? match[1].split(reSplitDetails) : [];
+}
+
+export default getWrapDetails;