record ID in AbstractNumbering

ts/numbering/abstract-numbering.ts

@@ -19,6 +19,7 @@ class AbstractNumberingAttributes extends XmlAttributeComponent {
 }
 
 export class AbstractNumbering extends XmlComponent {
+    public id: number;
 
     constructor(id: number) {
         super("w:abstractNum");
@@ -27,6 +28,7 @@ export class AbstractNumbering extends XmlComponent {
             restartNumberingAfterBreak: 0,
         }));
         this.root.push(new MultiLevelType("hybridMultilevel"));
+        this.id = id;
     }
 
     public addLevel(level: Level): void {
@@ -37,5 +39,6 @@ export class AbstractNumbering extends XmlComponent {
         _.forEach(this.root, (element) => {
             element.clearVariables();
         });
+        delete this.id;
     }
 }

ts/tests/numberingTest.ts

@@ -1,5 +1,6 @@
 import { expect } from "chai";
 import { Numbering } from "../numbering";
+import { AbstractNumbering } from "../numbering/abstract-numbering";
 import { Formatter } from '../export/formatter';
 
 function jsonify(obj: Object) {
@@ -44,4 +45,11 @@ describe("Numbering", () => {
             })
         });
     });
+});
+
+describe("AbstractNumbering", () => {
+    it("stores its ID at its .id property", () => {
+        const abstractNumbering = new AbstractNumbering(5);
+        expect(abstractNumbering.id).to.equal(5);
+    });
 });