From a00240adee4a3445047166abbf520632683730f7 Mon Sep 17 00:00:00 2001
From: Alex Hunt <huntie@meta.com>
Date: Thu, 12 Feb 2026 08:34:11 -0800
Subject: [PATCH] Update build to better locate prepack script

Summary: Changelog: [Internal]

Differential Revision: D92831007
---
 scripts/build/build.js | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/scripts/build/build.js b/scripts/build/build.js
index d96c4f080c2c..9ff364c58c6c 100644
--- a/scripts/build/build.js
+++ b/scripts/build/build.js
@@ -124,10 +124,15 @@ async function buildPackage(packageName /*: string */, prepack /*: boolean */) {
     // Run prepack script if configured
     if (prepack) {
       await new Promise((resolve, reject) => {
-        const child = spawn('npm', ['run', 'prepack'], {
-          cwd: path.resolve(PACKAGES_DIR, packageName),
-          stdio: ['ignore', 'ignore', 'inherit'],
-        });
+        const packagePath = path.resolve(PACKAGES_DIR, packageName);
+        const child = spawn(
+          process.execPath,
+          [path.join(__dirname, 'prepack.js')],
+          {
+            cwd: packagePath,
+            stdio: ['ignore', 'ignore', 'inherit'],
+          },
+        );
         child.on('close', code => {
           if (code !== 0) {
             reject(new Error(`prepack script exited with code ${code}`));