1 files changed, 32 insertions, 0 deletions
diff --git a/packages/gitbook-core/src/models/SummaryArticle.js b/packages/gitbook-core/src/models/SummaryArticle.js
new file mode 100644
index 0000000..3651c8a
--- /dev/null
+++ b/packages/gitbook-core/src/models/SummaryArticle.js
@@ -0,0 +1,32 @@
+const { Record, List } = require('immutable');
+
+const DEFAULTS = {
+    title:    '',
+    depth:    0,
+    path:     '',
+    url:      '',
+    ref:      '',
+    level:    '',
+    articles: List()
+};
+
+class SummaryArticle extends Record(DEFAULTS) {
+    constructor(article) {
+        super({
+            ...article,
+            articles: (new List(article.articles))
+                .map(art => new SummaryArticle(art))
+        });
+    }
+
+    /**
+     * Return true if article is an instance of SummaryArticle
+     * @param {Mixed} article
+     * @return {Boolean}
+     */
+    static is(article) {
+        return (article instanceof SummaryArticle);
+    }
+}
+
+module.exports = SummaryArticle;