From 05184179a44adce1a044dec4df1466d12a9c06a7 Mon Sep 17 00:00:00 2001
From: Juergen Kunz <juergen@foss.global>
Date: Thu, 5 Mar 2026 15:17:58 +0000
Subject: [PATCH] fix(compiler): fsync output directories after unpack to avoid
 XFS delayed logging causing corrupt or invisible directory entries during
 subsequent TypeScript emits

---
 changelog.md                          |  7 +++++++
 ts/00_commitinfo_data.ts              |  2 +-
 ts/mod_compiler/classes.tscompiler.ts | 14 ++++++++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/changelog.md b/changelog.md
index 1683000..ff16a22 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 2026-03-05 - 4.1.26 - fix(compiler)
+fsync output directories after unpack to avoid XFS delayed logging causing corrupt or invisible directory entries during subsequent TypeScript emits
+
+- Force fsync on each successful output directory (open, fsync, close) before the next compilation step.
+- Prevents XFS delayed logging from making directory entries invisible or corrupted during TypeScript emit operations.
+- Operation swallows errors if a directory doesn't exist yet; non-breaking fix with small additional IO.
+
 ## 2026-03-05 - 4.1.25 - fix(mod_unpack)
 flush directory metadata on XFS before reading and use readdirSync-based iteration to avoid missing entries when unpacking
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 8359714..25fae25 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '4.1.25',
+  version: '4.1.26',
   description: 'A tool for compiling TypeScript files using the latest nightly features, offering flexible APIs and a CLI for streamlined development.'
 }
diff --git a/ts/mod_compiler/classes.tscompiler.ts b/ts/mod_compiler/classes.tscompiler.ts
index 3706b05..dafb279 100644
--- a/ts/mod_compiler/classes.tscompiler.ts
+++ b/ts/mod_compiler/classes.tscompiler.ts
@@ -405,6 +405,20 @@ export class TsCompiler {
         successfulOutputDirs.push(destDir);
       }
 
+      // Fsync all output directories to force XFS metadata commit
+      // before the next compilation step. Without this, XFS delayed logging
+      // can cause directory entries from previous compilations to become
+      // invisible or corrupted during subsequent TypeScript emit operations.
+      for (const dir of successfulOutputDirs) {
+        try {
+          const fd = fs.openSync(dir, 'r');
+          fs.fsyncSync(fd);
+          fs.closeSync(fd);
+        } catch {
+          // Directory might not exist yet
+        }
+      }
+
       // Diagnostic: log all output directory states after each compilation
       if (!isQuiet && !isJson) {
         for (const prevDir of successfulOutputDirs) {