From 0b418202dc4be1ef1519679a71668b5c9c506371 Mon Sep 17 00:00:00 2001
From: Jack Pope <jackpope1@gmail.com>
Date: Wed, 8 Apr 2026 16:04:14 -0400
Subject: [PATCH] Fix FB_WWW eprh bundle dev guard

We use FB_WWW bundle to inject internal feature flag values, but need
to use NODE guard type because this is a node script -- __DEV__ is breaking
internal builds
---
 scripts/rollup/build.js    |  3 ++-
 scripts/rollup/bundles.js  |  5 ++++-
 scripts/rollup/wrappers.js | 11 +++++++++--
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index 66b74b436349..087c2e6a43b9 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -453,7 +453,8 @@ function getPlugins(
             globalName,
             filename,
             moduleType,
-            bundle.wrapWithModuleBoundaries
+            bundle.wrapWithModuleBoundaries,
+            bundle.wrapWithNodeDevGuard
           );
         },
       },
diff --git a/scripts/rollup/bundles.js b/scripts/rollup/bundles.js
index dbf6160a847e..7b9508b9e29c 100644
--- a/scripts/rollup/bundles.js
+++ b/scripts/rollup/bundles.js
@@ -1235,12 +1235,15 @@ const bundles = [
     // currently required in order for the package to be copied over correctly.
     // So, it would be worth improving that flow.
     name: 'eslint-plugin-react-hooks',
-    bundleTypes: [NODE_DEV, NODE_PROD, FB_WWW_DEV, FB_WWW_PROD, CJS_DTS],
+    bundleTypes: [NODE_DEV, NODE_PROD, FB_WWW_DEV, CJS_DTS],
     moduleType: ISOMORPHIC,
     entry: 'eslint-plugin-react-hooks/src/index.ts',
     global: 'ESLintPluginReactHooks',
     minifyWithProdErrorCodes: false,
     wrapWithModuleBoundaries: false,
+    // This is a Node.js build tool (ESLint plugin), not a www runtime bundle.
+    // Use process.env.NODE_ENV guard instead of __DEV__ for the dev wrapper.
+    wrapWithNodeDevGuard: true,
     preferBuiltins: true,
     externals: [
       '@babel/core',
diff --git a/scripts/rollup/wrappers.js b/scripts/rollup/wrappers.js
index 1773253cc965..52ae3b21252d 100644
--- a/scripts/rollup/wrappers.js
+++ b/scripts/rollup/wrappers.js
@@ -510,7 +510,8 @@ function wrapWithTopLevelDefinitions(
   globalName,
   filename,
   moduleType,
-  wrapWithModuleBoundaries
+  wrapWithModuleBoundaries,
+  wrapWithNodeDevGuard
 ) {
   if (wrapWithModuleBoundaries) {
     switch (bundleType) {
@@ -553,8 +554,14 @@ function wrapWithTopLevelDefinitions(
     return wrapper(source, globalName, filename, moduleType);
   }
 
+  // Node.js build tools (e.g. ESLint plugins) use process.env.NODE_ENV instead
+  // of __DEV__ even when building for FB_WWW, since they run in Node.js where
+  // __DEV__ is not defined.
+  const effectiveBundleType =
+    wrapWithNodeDevGuard && bundleType === FB_WWW_DEV ? NODE_DEV : bundleType;
+
   // All the other packages.
-  const wrapper = topLevelDefinitionWrappers[bundleType];
+  const wrapper = topLevelDefinitionWrappers[effectiveBundleType];
   if (typeof wrapper !== 'function') {
     throw new Error(`Unsupported build type: ${bundleType}.`);
   }