2 files changed, 16 insertions, 1 deletions
diff --git a/packages/gitbook-core/src/models/Plugin.js b/packages/gitbook-core/src/models/Plugin.js
index 0654f85..7ca5a86 100644
--- a/packages/gitbook-core/src/models/Plugin.js
+++ b/packages/gitbook-core/src/models/Plugin.js
@@ -7,7 +7,13 @@ const DEFAULTS = {
 };
 
 class Plugin extends Record(DEFAULTS) {
-
+    constructor(plugin) {
+        super({
+            init: plugin.init || DEFAULTS.init,
+            reduce: plugin.reduce || DEFAULTS.reduce,
+            actions: plugin.actions || DEFAULTS.actions
+        });
+    }
 }
 
 module.exports = Plugin;
diff --git a/packages/gitbook-core/src/models/SummaryArticle.js b/packages/gitbook-core/src/models/SummaryArticle.js
index b36fbe3..80ef5ae 100644
--- a/packages/gitbook-core/src/models/SummaryArticle.js
+++ b/packages/gitbook-core/src/models/SummaryArticle.js
@@ -52,6 +52,15 @@ class SummaryArticle extends Record(DEFAULTS) {
 
         return filePath + (parts.hash || '');
     }
+
+    /**
+     * Return true if article is an instance of SummaryArticle
+     * @param {Mixed} article
+     * @return {Boolean}
+     */
+    static is(article) {
+        return (article instanceof SummaryArticle);
+    }
 }
 
 module.exports = SummaryArticle;