Write pr-diff-range JSON file

Author: cklin

src/analyze.ts

@@ -537,6 +537,14 @@ extensions:
     `Wrote pr-diff-range extension pack to ${extensionFilePath}:\n${extensionContents}`,
   );
 
+  // Compute JSON file contents once
+  const jsonContents = JSON.stringify(ranges, null, 2);
+  const jsonFilePath = path.join(diffRangeDir, "pr-diff-range.json");
+  fs.writeFileSync(jsonFilePath, jsonContents);
+  logger.debug(
+    `Wrote pr-diff-range JSON file to ${jsonFilePath}:\n${jsonContents}`,
+  );
+
   return diffRangeDir;
 }