Move internal modules to “internal” folder.

.internal/baseInvoke.js

@@ -0,0 +1,24 @@
+import apply from './.internal/apply.js';
+import castPath from './.internal/castPath.js';
+import last from './last.js';
+import parent from './.internal/parent.js';
+import toKey from './.internal/toKey.js';
+
+/**
+ * The base implementation of `invoke` without support for individual
+ * method arguments.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {Array} args The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ */
+function baseInvoke(object, path, args) {
+  path = castPath(path, object);
+  object = parent(object, path);
+  const func = object == null ? object : object[toKey(last(path))];
+  return func == null ? undefined : apply(func, object, args);
+}
+
+export default baseInvoke;