diff --git a/lib/deps.js b/lib/deps.js
index 81fa996a..7dfc1203 100644
--- a/lib/deps.js
+++ b/lib/deps.js
@@ -54,8 +54,18 @@ const loadModule = (name) => {
   const subKeys = Object.keys(pkg.exports).map((key) => key.substring(2));
   const subNames = subKeys.filter(validSubmodules);
   for (const subName of subNames) {
-    const sub = appRequire(name + '/' + subName);
-    lib[subName] = sub;
+    try {
+      const sub = appRequire(name + '/' + subName);
+      if (lib[subName] && lib[subName] === sub[subName]) continue;
+      lib[subName] = sub;
+    } catch (err) {
+      if (err.code === 'MODULE_NOT_FOUND' && pkg.peerDependenciesMeta) {
+        const moduleName = metautil.between(err.message, "'", "'");
+        const optional = pkg.peerDependenciesMeta[moduleName]?.optional;
+        if (optional) continue;
+      }
+      throw err;
+    }
   }
   return lib;
 };