feature: add support to add mutiple sections to the document inc. headers and footers

- write missing tests

src/file/document/body/section-properties/page-size/index.ts

@@ -0,0 +1,2 @@
+export * from "./page-size";
+export * from "./page-size-attributes";

src/file/document/body/section-properties/page-size/page-size-attributes.ts

@@ -1,9 +1,14 @@
 import { XmlAttributeComponent } from "file/xml-components";
 
+export enum PageOrientation {
+    PORTRAIT = "portrait",
+    LANDSCAPE = "landscape",
+}
+
 export interface IPageSizeAttributes {
     width?: number;
     height?: number;
-    orientation?: string;
+    orientation?: PageOrientation;
 }
 
 export class PageSizeAttributes extends XmlAttributeComponent<IPageSizeAttributes> {

src/file/document/body/section-properties/page-size/page-size.spec.ts

@@ -2,11 +2,12 @@ import { expect } from "chai";
 
 import { Formatter } from "../../../../../export/formatter";
 import { PageSize } from "./page-size";
+import { PageOrientation } from "./page-size-attributes";
 
 describe("PageSize", () => {
     describe("#constructor()", () => {
         it("should create page size with portrait", () => {
-            const properties = new PageSize(100, 200, "portrait");
+            const properties = new PageSize(100, 200, PageOrientation.PORTRAIT);
             const tree = new Formatter().format(properties);
 
             expect(Object.keys(tree)).to.deep.equal(["w:pgSz"]);
@@ -15,7 +16,7 @@ describe("PageSize", () => {
         });
 
         it("should create page size with horizontal and invert the lengths", () => {
-            const properties = new PageSize(100, 200, "landscape");
+            const properties = new PageSize(100, 200, PageOrientation.LANDSCAPE);
             const tree = new Formatter().format(properties);
 
             expect(Object.keys(tree)).to.deep.equal(["w:pgSz"]);

src/file/document/body/section-properties/page-size/page-size.ts

@@ -1,11 +1,11 @@
 import { XmlComponent } from "file/xml-components";
-import { PageSizeAttributes } from "./page-size-attributes";
+import { PageSizeAttributes, PageOrientation } from "./page-size-attributes";
 
 export class PageSize extends XmlComponent {
-    constructor(width: number, height: number, orientation: string) {
+    constructor(width: number, height: number, orientation: PageOrientation) {
         super("w:pgSz");
 
-        const flip = orientation === "landscape";
+        const flip = orientation === PageOrientation.LANDSCAPE;
 
         this.root.push(
             new PageSizeAttributes({