From 478156456e92c3db04803953127b4a4af2db064c Mon Sep 17 00:00:00 2001
From: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Date: Fri, 1 May 2026 15:49:14 -0500
Subject: core: fix npm package detection to properly handle cached directories
 without installed packages (#25354)

---
 packages/core/src/npm.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'packages/core/src')

diff --git a/packages/core/src/npm.ts b/packages/core/src/npm.ts
index 92e404276..8dac8faf0 100644
--- a/packages/core/src/npm.ts
+++ b/packages/core/src/npm.ts
@@ -120,13 +120,17 @@ export const layer = Layer.effect(
         }
       })()
 
-      if (yield* afs.existsSafe(dir)) {
+      if (yield* afs.existsSafe(path.join(dir, "node_modules", name))) {
         return resolveEntryPoint(name, path.join(dir, "node_modules", name))
       }
 
       const tree = yield* reify({ dir, add: [pkg] })
       const first = tree.edgesOut.values().next().value?.to
-      if (!first) return yield* new InstallFailedError({ add: [pkg], dir })
+      if (!first) {
+        const result = resolveEntryPoint(name, path.join(dir, "node_modules", name))
+        if (Option.isSome(result.entrypoint)) return result
+        return yield* new InstallFailedError({ add: [pkg], dir })
+      }
       return resolveEntryPoint(first.name, first.path)
     }, Effect.scoped)
 
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