Move internal modules to “internal” folder.

.internal/baseXor.js

@@ -0,0 +1,36 @@
+import baseDifference from './.internal/baseDifference.js';
+import baseFlatten from './.internal/baseFlatten.js';
+import baseUniq from './.internal/baseUniq.js';
+
+/**
+ * The base implementation of methods like `xor` which accepts an array of
+ * arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of values.
+ */
+function baseXor(arrays, iteratee, comparator) {
+  const length = arrays.length;
+  if (length < 2) {
+    return length ? baseUniq(arrays[0]) : [];
+  }
+  let index = -1;
+  const result = Array(length);
+
+  while (++index < length) {
+    const array = arrays[index];
+    let othIndex = -1;
+
+    while (++othIndex < length) {
+      if (othIndex != index) {
+        result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
+      }
+    }
+  }
+  return baseUniq(baseFlatten(result, 1), iteratee, comparator);
+}
+
+export default baseXor;