From 7b84dbd1697609d4df5931422c9591fe62022cb9 Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Wed, 24 Mar 2021 02:43:55 +0000
Subject: [PATCH] Fail build on deep requires in npm packages (#21063)

---
 scripts/rollup/build.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index d25110eed892a..41b0685098fa0 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -582,6 +582,17 @@ async function createBundle(bundle, bundleType) {
       const containsThisModule = pkg => id === pkg || id.startsWith(pkg + '/');
       const isProvidedByDependency = externals.some(containsThisModule);
       if (!shouldBundleDependencies && isProvidedByDependency) {
+        if (id.indexOf('/src/') !== -1) {
+          throw Error(
+            'You are trying to import ' +
+              id +
+              ' but ' +
+              externals.find(containsThisModule) +
+              ' is one of npm dependencies, ' +
+              'so it will not contain that source file. You probably want ' +
+              'to create a new bundle entry point for it instead.'
+          );
+        }
         return true;
       }
       return !!peerGlobals[id];