add settings option to add trackRevisions

src/file/settings/settings.ts

@@ -1,6 +1,7 @@
 import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
 import { Compatibility } from "./compatibility";
 import { UpdateFields } from "./update-fields";
+import { TrackRevisions } from "./track-revisions";
 
 export interface ISettingsAttributesProperties {
     readonly wpc?: string;
@@ -46,6 +47,7 @@ export class SettingsAttributes extends XmlAttributeComponent<ISettingsAttribute
 
 export class Settings extends XmlComponent {
     private readonly compatibility;
+    private readonly trackRevisions;
 
     constructor() {
         super("w:settings");
@@ -71,6 +73,7 @@ export class Settings extends XmlComponent {
             }),
         );
         this.compatibility = new Compatibility();
+        this.trackRevisions = new TrackRevisions();
     }
 
     public addUpdateFields(): void {
@@ -86,4 +89,12 @@ export class Settings extends XmlComponent {
 
         return this.compatibility;
     }
+
+    public addTrackRevisions(): TrackRevisions {
+        if (!this.root.find((child) => child instanceof TrackRevisions)) {
+            this.addChildElement(this.trackRevisions);
+        }
+
+        return this.trackRevisions;
+    }
 }

src/file/settings/track-revisions.spec.ts

@@ -0,0 +1,16 @@
+import { expect } from "chai";
+import { Formatter } from "export/formatter";
+import { TrackRevisions } from "file/settings/track-revisions";
+
+import { EMPTY_OBJECT } from "file/xml-components";
+
+describe("TrackRevisions", () => {
+    describe("#constructor", () => {
+        it("creates an initially empty property object", () => {
+            const trackRevisions = new TrackRevisions();
+
+            const tree = new Formatter().format(trackRevisions);
+            expect(tree).to.deep.equal({ "w:trackRevisions": EMPTY_OBJECT });
+        });
+    });
+});

src/file/settings/track-revisions.ts

@@ -0,0 +1,7 @@
+import { XmlComponent } from "file/xml-components";
+
+export class TrackRevisions extends XmlComponent {
+    constructor() {
+        super("w:trackRevisions");
+    }
+}