Introduce some functional programming techniques

src/file/drawing/text-wrap/text-wrapping.ts

@@ -16,7 +16,7 @@ export enum WrapTextOption {
 }
 
 export interface ITextWrapping {
-    textWrapStyle: TextWrapStyle;
-    wrapTextOption?: WrapTextOption;
-    distanceFromText?: IDistance;
+    readonly textWrapStyle: TextWrapStyle;
+    readonly wrapTextOption?: WrapTextOption;
+    readonly distanceFromText?: IDistance;
 }

src/file/drawing/text-wrap/wrap-square.ts

@@ -4,11 +4,11 @@ import { ITextWrapping, WrapTextOption } from ".";
 import { IDistance } from "../drawing";
 
 interface IWrapSquareAttributes extends IDistance {
-    wrapText?: WrapTextOption;
+    readonly wrapText?: WrapTextOption;
 }
 
 class WrapSquareAttributes extends XmlAttributeComponent<IWrapSquareAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         distT: "distT",
         distB: "distB",
         distL: "distL",

src/file/drawing/text-wrap/wrap-tight.ts

@@ -3,25 +3,25 @@ import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
 import { IDistance } from "../drawing";
 
 interface IWrapTightAttributes {
-    distT?: number;
-    distB?: number;
+    readonly distT?: number;
+    readonly distB?: number;
 }
 
 class WrapTightAttributes extends XmlAttributeComponent<IWrapTightAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         distT: "distT",
         distB: "distB",
     };
 }
 
 export class WrapTight extends XmlComponent {
-    constructor(distanceFromText?: IDistance) {
-        super("wp:wrapTight");
-
-        distanceFromText = distanceFromText || {
+    constructor(
+        distanceFromText: IDistance = {
             distT: 0,
             distB: 0,
-        };
+        },
+    ) {
+        super("wp:wrapTight");
 
         this.root.push(
             new WrapTightAttributes({

src/file/drawing/text-wrap/wrap-top-and-bottom.ts

@@ -3,25 +3,25 @@ import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
 import { IDistance } from "../drawing";
 
 interface IWrapTopAndBottomAttributes {
-    distT?: number;
-    distB?: number;
+    readonly distT?: number;
+    readonly distB?: number;
 }
 
 class WrapTopAndBottomAttributes extends XmlAttributeComponent<IWrapTopAndBottomAttributes> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         distT: "distT",
         distB: "distB",
     };
 }
 
 export class WrapTopAndBottom extends XmlComponent {
-    constructor(distanceFromText?: IDistance) {
-        super("wp:wrapTopAndBottom");
-
-        distanceFromText = distanceFromText || {
+    constructor(
+        distanceFromText: IDistance = {
             distT: 0,
             distB: 0,
-        };
+        },
+    ) {
+        super("wp:wrapTopAndBottom");
 
         this.root.push(
             new WrapTopAndBottomAttributes({