diff --git a/tsup.config.ts b/tsup.config.ts
index 3bf41e0..b7fbc27 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -1,3 +1,17 @@
 import { createLibraryConfig } from '@lilith/configs/tsup/library';
 
-export default createLibraryConfig();
+// Override to produce a browser-safe bundle.
+// NodeDictionaryLoader and DictionaryPersistence import fs/path/fs/promises.
+// These are dead code in browser consumers, but esbuild keeps the import
+// statements for externalized modules. Use esbuildOptions.alias to redirect
+// those imports to an empty browser stub so the dist has no Node.js imports.
+export default createLibraryConfig({
+  esbuildOptions(options) {
+    options.alias = {
+      ...options.alias,
+      fs: './src/browser-stubs/node-modules.ts',
+      path: './src/browser-stubs/node-modules.ts',
+      'fs/promises': './src/browser-stubs/node-modules.ts',
+    };
+  },
+});