From 764b779772d9af25369c5ea6fd8e6c5dc3ae2e8f Mon Sep 17 00:00:00 2001
From: Phil Pluckthun <phil@kitten.sh>
Date: Mon, 19 Oct 2026 15:45:30 +0100
Subject: [PATCH 1/2] Prevent promise creation for dependency traversal when
 dependency was already visited

---
 .../metro/src/DeltaBundler/buildSubgraph.js   | 21 +++++++++++--------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/packages/metro/src/DeltaBundler/buildSubgraph.js b/packages/metro/src/DeltaBundler/buildSubgraph.js
index dadf39a629..281e305383 100644
--- a/packages/metro/src/DeltaBundler/buildSubgraph.js
+++ b/packages/metro/src/DeltaBundler/buildSubgraph.js
@@ -138,19 +138,22 @@ export async function buildSubgraph<T>(
       ...resolutionResult,
     });
 
-    await Promise.all(
-      [...resolutionResult.dependencies.values()]
-        .filter(
-          dependency =>
-            isResolvedDependency(dependency) && shouldTraverse(dependency),
-        )
-        .map(dependency =>
+    const visitPromises: Promise[] = [];
+    for (const dependency of resolutionResult.dependencies.values()) {
+      if (
+        isResolvedDependency(dependency) &&
+        shouldTraverse(dependency) &&
+        !visitedPaths.has(dependency.absolutePath)
+      ) {
+        visitPromises.push(
           visit(
             dependency.absolutePath,
             resolutionResult.virtualSources.get(dependency.data.data.key),
           ).catch(error => errors.set(dependency.absolutePath, error)),
-        ),
-    );
+        );
+      }
+    }
+    await Promise.all(visitPromises);
   }
 
   await Promise.all(

From 2712c69105c5ceceef40bcf3932832c4d64b7467 Mon Sep 17 00:00:00 2001
From: Rob Hogan <2590098+robhogan@users.noreply.github.com>
Date: Sun, 25 Oct 2026 10:07:37 +0000
Subject: [PATCH 2/2] =?UTF-8?q?Use=20a=20catch=20block=20over=20an=20expre?=
 =?UTF-8?q?ssion,=20don=E2=80=99t=20retain=20errors=20twice?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/metro/src/DeltaBundler/buildSubgraph.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/metro/src/DeltaBundler/buildSubgraph.js b/packages/metro/src/DeltaBundler/buildSubgraph.js
index 281e305383..a53fb57235 100644
--- a/packages/metro/src/DeltaBundler/buildSubgraph.js
+++ b/packages/metro/src/DeltaBundler/buildSubgraph.js
@@ -138,7 +138,7 @@ export async function buildSubgraph<T>(
       ...resolutionResult,
     });
 
-    const visitPromises: Promise[] = [];
+    const visitPromises: Array<Promise<void>> = [];
     for (const dependency of resolutionResult.dependencies.values()) {
       if (
         isResolvedDependency(dependency) &&
@@ -149,7 +149,9 @@ export async function buildSubgraph<T>(
           visit(
             dependency.absolutePath,
             resolutionResult.virtualSources.get(dependency.data.data.key),
-          ).catch(error => errors.set(dependency.absolutePath, error)),
+          ).catch(error => {
+            errors.set(dependency.absolutePath, error);
+          }),
         );
       }
     }