Add option to change indent string

Author: Soc Sieng

src/render/indentor.ts

@@ -1,18 +1,24 @@
 export default class Indentor {
-  private _indentCache: string[];
-  private _indentString: string;
+  public static indentString: string = '  ';
 
-  constructor(indentString: string = '  ') {
-    this._indentCache = [];
+  private _indentCache: { [key: string]: string };
+  private _indentString?: string;
+
+  constructor(indentString?: string) {
+    this._indentCache = {};
     this._indentString = indentString;
   }
 
   public getIndent(size: number): string {
     if (size === 0) return '';
 
-    let indent = this._indentCache[size];
+    const indentString = this._indentString ?? Indentor.indentString;
+    const key = `${indentString}_${size}`;
+
+    let indent = this._indentCache[key];
     if (indent === undefined) {
-      indent = new Array(size).fill(this._indentString).join('');
+      indent = new Array(size).fill(indentString).join('');
+      this._indentCache[key] = indent;
     }
     return indent;
   }

src/render/reflection-formatter.ts

@@ -25,6 +25,7 @@ export const sortMapping: { [key: string]: ReflectionSortFlags | undefined } = {
 
 export default class ReflectionFormatter {
   public static sortOption: ReflectionSortFlags = ReflectionSortFlags.none;
+  public static indentString: string = '  ';
 
   public render(reflection?: Reflection, terminatorCharater?: string): string {
     if (reflection) {

src/typescript-declaration-plugin.ts

@@ -8,6 +8,7 @@ import { Renderer } from 'typedoc/dist/lib/output/renderer';
 import { RendererComponent } from 'typedoc/dist/lib/output/components';
 import { RendererEvent } from 'typedoc/dist/lib/output/events';
 import mkdir from 'make-dir';
+import Indentor from './render/indentor';
 
 const declarationFileOption = {
   name: 'declarationFile',
@@ -30,11 +31,19 @@ const sortOptionOption = {
   map: sortMapping,
 } as DeclarationOption;
 
+const indentStringOption = {
+  name: 'indentString',
+  type: ParameterType.String,
+  help: 'Indent declarations using this string. Defaults to \'  \'',
+  defaultValue: '  ',
+} as DeclarationOption;
+
 export class TypeScriptDeclarationPlugin extends RendererComponent {
   static options = [
     declarationFileOption,
     declarationOnlyOption,
     sortOptionOption,
+    indentStringOption,
   ];
 
   @BindOption(declarationFileOption.name)
@@ -76,9 +85,11 @@ export class TypeScriptDeclarationPlugin extends RendererComponent {
         .filter(c => c.componentName !== 'typescript-declaration')
         .forEach(c => app.renderer.removeComponent(c.componentName));
     }
+
+    Indentor.indentString = app.options.getValue('indentString') as string;
   }
 
-  private veriftProject(project: ProjectReflection) {
+  private verifyProject(project: ProjectReflection) {
     if (this._declarationOnly && !this._declarationFile) {
       throw new Error('--declarationFile file must be specified when using the --declarationOnly option');
     }
@@ -97,7 +108,7 @@ export class TypeScriptDeclarationPlugin extends RendererComponent {
   }
 
   private onRenderBegin(event: RendererEvent) {
-    this.veriftProject(event.project);
+    this.verifyProject(event.project);
   }
 
   public static generateTypeDeclarations(project: ProjectReflection, sortOption: ReflectionSortFlags, filename?: string) {