fix

book/node_modules/honkit/lib/modifiers/summary/editPartTitle.js

@@ -0,0 +1,21 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+/**
+ Edit title of a part in the summary
+
+ @param {Summary} summary
+ @param {number} index
+ @param {string} newTitle
+ @return {Summary}
+ */
+function editPartTitle(summary, index, newTitle) {
+    let parts = summary.getParts();
+    let part = parts.get(index);
+    if (!part) {
+        return summary;
+    }
+    part = part.set("title", newTitle);
+    parts = parts.set(index, part);
+    return summary.set("parts", parts);
+}
+exports.default = editPartTitle;