Move internal modules to “internal” folder.

.internal/composeArgsRight.js

@@ -0,0 +1,42 @@
+/* Built-in method references for those with the same name as other `lodash` methods. */
+const nativeMax = Math.max;
+
+/**
+ * This function is like `composeArgs` except that the arguments composition
+ * is tailored for `partialRight`.
+ *
+ * @private
+ * @param {Array} args The provided arguments.
+ * @param {Array} partials The arguments to append to those provided.
+ * @param {Array} holders The `partials` placeholder indexes.
+ * @params {boolean} [isCurried] Specify composing for a curried function.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+function composeArgsRight(args, partials, holders, isCurried) {
+  let argsIndex = -1;
+  let holdersIndex = -1;
+  let rightIndex = -1;
+
+  const argsLength = args.length;
+  const holdersLength = holders.length;
+  const rightLength = partials.length;
+  const rangeLength = nativeMax(argsLength - holdersLength, 0);
+  const result = Array(rangeLength + rightLength);
+  const isUncurried = !isCurried;
+
+  while (++argsIndex < rangeLength) {
+    result[argsIndex] = args[argsIndex];
+  }
+  const offset = argsIndex;
+  while (++rightIndex < rightLength) {
+    result[offset + rightIndex] = partials[rightIndex];
+  }
+  while (++holdersIndex < holdersLength) {
+    if (isUncurried || argsIndex < argsLength) {
+      result[offset + holders[holdersIndex]] = args[argsIndex++];
+    }
+  }
+  return result;
+}
+
+export default composeArgsRight;