From e0cdf6df134eaf8e7388083d76827d5052860770 Mon Sep 17 00:00:00 2001
From: Carlos Scheidegger <carlos.scheidegger@posit.co>
Date: Thu, 9 Apr 2026 11:35:36 -0500
Subject: [PATCH] catch exception when directory contents change mid-traversal
 (#14342)

---
 news/changelog-1.10.md |  2 +-
 src/core/path.ts       | 24 +++++++++++++++++-------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/news/changelog-1.10.md b/news/changelog-1.10.md
index 2306b5ec79a..f3cadc2244c 100644
--- a/news/changelog-1.10.md
+++ b/news/changelog-1.10.md
@@ -40,4 +40,4 @@ All changes included in 1.10:
 
 - ([#6651](https://github.com/quarto-dev/quarto-cli/issues/6651)): Fix dart-sass compilation failing in enterprise environments where `.bat` files are blocked by group policy.
 - ([#14255](https://github.com/quarto-dev/quarto-cli/issues/14255)): Fix shortcodes inside inline and display math expressions not being resolved.
-
+- ([#14342](https://github.com/quarto-dev/quarto-cli/issues/14342)): Work around TOCTOU race in Deno's `expandGlobSync` that can cause unexpected exceptions to be raised while traversing directories during project initialization.
\ No newline at end of file
diff --git a/src/core/path.ts b/src/core/path.ts
index 3d671af79ed..a2132b0fc90 100644
--- a/src/core/path.ts
+++ b/src/core/path.ts
@@ -172,13 +172,23 @@ export function resolvePathGlobs(
   const expandGlobs = (targetGlobs: string[]) => {
     const expanded: string[] = [];
     for (const glob of targetGlobs) {
-      for (
-        const file of expandGlobSync(
-          glob,
-          { root, exclude, includeDirs: true, extended: true, globstar: true },
-        )
-      ) {
-        expanded.push(file.path);
+      try {
+        for (
+          const file of expandGlobSync(
+            glob,
+            { root, exclude, includeDirs: true, extended: true, globstar: true },
+          )
+        ) {
+          expanded.push(file.path);
+        }
+      } catch (e) {
+        // expandGlobSync can throw NotFound if a file is deleted between
+        // directory listing and stat (TOCTOU race). This is expected during
+        // preview when the IDE or other processes modify the project
+        // directory concurrently.
+        if (!(e instanceof Deno.errors.NotFound)) {
+          throw e;
+        }
       }
     }
     return ld.uniq(expanded);