fix: chdir back to the starting directory before exit (#167)

src/index.ts

@@ -1,10 +1,14 @@
 import { readFileSync } from 'fs';
+import path from 'path';
 import { toJS, resolve, versionCheck } from './util';
 import { Document } from './document';
 import { parse } from './parser';
 
 import type { AsyncAPIObject } from './spec-types';
 
+// remember the directory where execution of the program started
+const originDir = String(process.cwd());
+
 /**
  *
  * @param {string | string[]} files One or more relative/absolute paths to
@@ -87,9 +91,9 @@ export default async function bundle(
  }
 
  if (options.baseDir && typeof options.baseDir === 'string') {
- process.chdir(options.baseDir);
+ process.chdir(path.resolve(originDir, options.baseDir));
  } else if (options.baseDir && Array.isArray(options.baseDir)) {
- process.chdir(String(options.baseDir[0])); // guard against passing an array
+ process.chdir(path.resolve(originDir, String(options.baseDir[0]))); // guard against passing an array
  }
 
  const readFiles = files.map(file => readFileSync(file, 'utf-8')); // eslint-disable-line
@@ -114,6 +118,11 @@ export default async function bundle(
  options
  );
 
+ // return to the starting directory before finishing the execution
+ if (options.baseDir) {
+ process.chdir(originDir);
+ }
+
  return new Document(resolvedJsons, options.base);
 }