================
@@ -915,7 +915,10 @@ Error JSONGenerator::serializeIndex(StringRef RootDir) {
   raw_fd_ostream RootOS(IndexFilePath, FileErr, sys::fs::OF_Text);
   if (FileErr)
     return createFileError("cannot open file " + IndexFilePath, FileErr);
-  RootOS << llvm::formatv("{0:2}", ObjVal);
+  if (CDCtx->CompactJSON)
+    RootOS << llvm::formatv("{0}", ObjVal);
+  else
+    RootOS << llvm::formatv("{0:2}", ObjVal);
----------------
ilovepi wrote:

we only do this in 2 spots, but maybe we want some wrapper class that controls 
these options. and lives in the CDCtx? not a major deal ATM, but if we think we 
want any more control/customization, we may want to consider it.

https://github.com/llvm/llvm-project/pull/190822
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