From 36e5ddb0f2463a175c04b990451a396f0028d86c Mon Sep 17 00:00:00 2001
From: leaysgur <6259812+leaysgur@users.noreply.github.com>
Date: Tue, 27 Oct 2026 09:25:14 +0000
Subject: [PATCH] feat(oxfmt): add debug span for reading files (#28204)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Reading a file happens outside the `oxfmt::format` span, so time spent in I/O did not show up with `OXC_LOG=debug`.

On a machine where an endpoint security agent scans every `open()`/`close()`, most of the wall time was spent there, but the log only showed formatting time.

```
DEBUG oxfmt::read{path=src/foo.tsx}: oxfmt::cli::service: close time.busy=92.6µs time.idle=2.38µs
```

🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
 apps/oxfmt/src/cli/service.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/oxfmt/src/cli/service.rs b/apps/oxfmt/src/cli/service.rs
index 15204281aa..cf302c62a7 100644
--- a/apps/oxfmt/src/cli/service.rs
+++ b/apps/oxfmt/src/cli/service.rs
@@ -7,6 +7,7 @@ use std::{
 
 use cow_utils::CowUtils;
 use rayon::prelude::*;
+use tracing::debug_span;
 
 use oxc_diagnostics::{DiagnosticSender, DiagnosticService};
 
@@ -44,7 +45,9 @@ impl FormatService {
             let start_time = matches!(self.format_mode, OutputMode::Check).then(Instant::now);
 
             let path = Arc::clone(&plan.path);
-            let Ok(source_text) = utils::read_to_string(&path) else {
+            let Ok(source_text) = debug_span!("oxfmt::read", path = %path.display())
+                .in_scope(|| utils::read_to_string(&path))
+            else {
                 // This happens if binary file is attempted to be formatted
                 // e.g. `.ts` for MPEG-TS video file
                 let diagnostics = DiagnosticService::wrap_diagnostics(