Refactor using gitea-js.

src/github-action.ts

@@ -48,34 +48,36 @@ async function getCommitDiff(commitSha: string): Promise<{ sha: SHA; diff: Diff
         'diff'
       );
 
-      return {
-        sha: commitSha,
-        diff: response.data,
-      };
+      const diff = response.data ?? '';
+      if (!diff) {
+        core.warning(`No diff data for commit ${commitSha}`);
+      }
+
+      return { sha: commitSha, diff };
     } catch (error) {
-      core.error(`Failed to fetch Gitea/Forgejo commit diff: ${error}`);
+      core.error(`Error fetching Gitea/Forgejo diff for ${commitSha}: ${error}`);
       throw error;
     }
   }
 
-  // GitHub path unchanged
   const diffResponse = await octokit.request<string>(
     'GET /repos/{owner}/{repo}/commits/{ref}',
     {
       owner,
       repo,
       ref: commitSha,
-      headers: {
-        Accept: 'application/vnd.github.v3.diff',
-      },
+      headers: { Accept: 'application/vnd.github.v3.diff' },
     }
   );
 
-  return { sha: commitSha, diff: diffResponse.data };
+  const diff = diffResponse.data ?? '';
+  if (!diff) {
+    core.warning(`No diff data from GitHub for commit ${commitSha}`);
+  }
+
+  return { sha: commitSha, diff };
 }
 
-
-
 interface DiffAndSHA {
   sha: SHA;
   diff: Diff;