1 files changed, 18 insertions, 0 deletions
diff --git a/packages/gitbook-plugin-theme-default/src/reducers/sidebar.js b/packages/gitbook-plugin-theme-default/src/reducers/sidebar.js
new file mode 100644
index 0000000..eef68d4
--- /dev/null
+++ b/packages/gitbook-plugin-theme-default/src/reducers/sidebar.js
@@ -0,0 +1,18 @@
+const GitBook = require('gitbook-core');
+const { Record } = GitBook.Immutable;
+const ActionTypes = require('../actions/types');
+
+const SidebarState = Record({
+    open: true
+});
+
+function reduceSidebar(state = SidebarState(), action) {
+    switch (action.type) {
+    case ActionTypes.TOGGLE_SIDEBAR:
+        return state.set('open', !state.get('open'));
+    default:
+        return state;
+    }
+}
+
+module.exports = reduceSidebar;