refactor: filter entries that are default log fields types

src/service/retrieveCommitMessages.ts

@@ -1,6 +1,6 @@
 'use strict';
 import { readFileSync } from 'node:fs';
-import { simpleGit, SimpleGit, SimpleGitOptions, DefaultLogFields } from 'simple-git';
+import { simpleGit, SimpleGit, SimpleGitOptions, DefaultLogFields, LogResult } from 'simple-git';
 
 export async function retrieveCommitMessages(
   fromCommit: string,
@@ -14,8 +14,10 @@ export async function retrieveCommitMessages(
     trimmed: false,
   };
   const git: SimpleGit = simpleGit(options);
-  const result = await git.log({ from: fromCommit, to: toCommit, format: '%s' });
-  const commitMessages = (result.all as unknown as DefaultLogFields[]).map((commit) => commit.message);
+  const result: LogResult<string | DefaultLogFields> = await git.log({ from: fromCommit, to: toCommit, format: '%s' });
+
+  // Filter only entries that match the DefaultLogFields type
+  const commitMessages: string[] = (result.all as DefaultLogFields[]).map((commit) => commit.message);
 
   let regex: RegExp;
   let regexPattern = '';