Fix dist command

1 files changed, 16 insertions, 0 deletions

diff --git a/packages/gitbook-core/src/lib/composeReducer.js b/packages/gitbook-core/src/lib/composeReducer.js
new file mode 100644
index 0000000..fa2a589
--- /dev/null
+++ b/packages/gitbook-core/src/lib/composeReducer.js
@@ -0,0 +1,16 @@
+
+/**
+ * Compose multiple reducers into one
+ * @param  {Function} reducers
+ * @return {Function}
+ */
+function composeReducer(...reducers) {
+    return (state, action) => {
+        return reducers.reduce(
+            (newState, reducer) => reducer(newState, action),
+            state
+        );
+    };
+}
+
+module.exports = composeReducer;