refactor(errors): remove ChangelogFileNotFoundError

- Improved error handling in changelog service.
- Replaced custom error with FileNotFoundError.
- Simplified error handling logic.
- Removed unnecessary error class.
- Updated tests to reflect changes.

Author: taj54

src/errors.ts

@@ -43,12 +43,3 @@ export class InvalidManifestError extends CustomError {
     super(message, 'InvalidManifestError');
   }
 }
-
-/**
- * Error thrown when the changelog file is not found.
- */
-export class ChangelogFileNotFoundError extends CustomError {
-  constructor(message: string) {
-    super(message, 'ChangelogFileNotFoundError');
-  }
-}

src/services/changelogService.ts

@@ -54,11 +54,9 @@ export class ChangelogService {
     let existingChangelog: string;
     try {
       existingChangelog = await this.fileHandler.readFile(changelogPath);
-    } catch (error: any) {
-      if (error.code === 'ENOENT') {
-        throw new FileNotFoundError(
-          `Changelog file not found at ${changelogPath}`,
-        );
+    } catch (error: unknown) {
+      if (error instanceof FileNotFoundError) {
+        throw new FileNotFoundError(`Changelog file not found at ${changelogPath}`);
       }
       throw error;
     }

tests/services/changelogService.test.ts

@@ -69,8 +69,7 @@ describe('ChangelogService', () => {
 
   it('should throw FileNotFoundError if changelog file does not exist', async () => {
     const changelogPath = 'CHANGELOG.md';
-    const error = new Error('File not found') as any;
-    error.code = 'ENOENT';
+    const error = new FileNotFoundError('File not found');
     vi.spyOn(fileHandler, 'readFile').mockRejectedValue(error);
 
     await expect(changelogService.updateChangelog('## v1.1.0\n\n- New feature')).rejects.toThrow(