fix: Fix extends option in tsconfig.json doesn't work (#1273)

Clone typedoc options object after loading file content.

Closes #1272

src/lib/utils/options/readers/typedoc.ts

@@ -1,6 +1,6 @@
 import * as Path from 'path';
 import * as FS from 'fs';
-import * as _ from 'lodash';
+import { cloneDeep } from 'lodash';
 
 import { OptionsReader } from '..';
 import { Logger } from '../../loggers';
@@ -51,13 +51,16 @@ export class TypeDocReader implements OptionsReader {
         }
         seen.add(file);
 
-        const data: unknown = require(file);
+        const fileContent: unknown = require(file);
 
-        if (typeof data !== 'object' || !data) {
+        if (typeof fileContent !== 'object' || !fileContent) {
             logger.error(`The file ${file} is not an object.`);
             return;
         }
 
+        // clone option object to avoid of property changes in re-calling this file
+        const data: object = cloneDeep(fileContent);
+
         if ('extends' in data) {
             const extended: string[] = getStringArray(data['extends']);
             for (const extendedFile of extended) {