diff --git a/electron.vite.config.ts b/electron.vite.config.ts
index d1303ea..0657da2 100644
--- a/electron.vite.config.ts
+++ b/electron.vite.config.ts
@@ -33,6 +33,12 @@ export default defineConfig({
     build: {
       outDir: 'dist/renderer',
     },
+    optimizeDeps: {
+      // @lexical/code-prism depends on prismjs + its language components via
+      // CJS require().  Vite must pre-bundle them together so that the Prism
+      // global is available when component IIFEs execute.
+      include: ['prismjs', '@lexical/code-prism'],
+    },
     plugins: [react(), tailwindcss()],
     resolve: {
       alias: {
diff --git a/src/renderer/lib/prismSetup.ts b/src/renderer/lib/prismSetup.ts
deleted file mode 100644
index 4823780..0000000
--- a/src/renderer/lib/prismSetup.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-/**
- * Ensures the PrismJS global is available before @lexical/code-prism
- * captures its tokenizer reference.
- *
- * @lexical/code-prism reads `globalThis.Prism` at module-evaluation time.
- * In Vite dev mode the esbuild CJS shim may not have set the global yet,
- * so we force it here.  This module must be imported before any module
- * that transitively loads @lexical/code-prism.
- */
-import Prism from 'prismjs';
-
-if (typeof globalThis !== 'undefined' && !globalThis.Prism) {
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  (globalThis as any).Prism = Prism;
-}
diff --git a/src/renderer/main.tsx b/src/renderer/main.tsx
index 4591098..cc67373 100644
--- a/src/renderer/main.tsx
+++ b/src/renderer/main.tsx
@@ -1,7 +1,6 @@
 import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 
-import '@renderer/lib/prismSetup';
 import App from '@renderer/App';
 import '@renderer/styles.css';