diff --git a/src/renderer/components/MarkdownComposer.tsx b/src/renderer/components/MarkdownComposer.tsx
index f6add2b..5ac82a9 100644
--- a/src/renderer/components/MarkdownComposer.tsx
+++ b/src/renderer/components/MarkdownComposer.tsx
@@ -21,29 +21,6 @@ import {
   $convertToMarkdownString,
 } from '@lexical/markdown';
 import { $isCodeNode, $createCodeNode, CodeNode } from '@lexical/code';
-
-// Prism must be on `globalThis` before @lexical/code-prism initializes its
-// tokenizer reference.  Vite's dev-mode esbuild CJS shim can race the global
-// assignment, so we force it here before importing the module.
-import Prism from 'prismjs';
-import 'prismjs/components/prism-clike';
-import 'prismjs/components/prism-javascript';
-import 'prismjs/components/prism-markup';
-import 'prismjs/components/prism-markdown';
-import 'prismjs/components/prism-c';
-import 'prismjs/components/prism-css';
-import 'prismjs/components/prism-objectivec';
-import 'prismjs/components/prism-sql';
-import 'prismjs/components/prism-python';
-import 'prismjs/components/prism-rust';
-import 'prismjs/components/prism-swift';
-import 'prismjs/components/prism-typescript';
-import 'prismjs/components/prism-java';
-import 'prismjs/components/prism-cpp';
-if (typeof globalThis !== 'undefined') {
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  (globalThis as any).Prism = Prism;
-}
 import { registerCodeHighlighting } from '@lexical/code-prism';
 import {
   $isListNode,
diff --git a/src/renderer/lib/prismSetup.ts b/src/renderer/lib/prismSetup.ts
new file mode 100644
index 0000000..4823780
--- /dev/null
+++ b/src/renderer/lib/prismSetup.ts
@@ -0,0 +1,15 @@
+/**
+ * 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 cc67373..4591098 100644
--- a/src/renderer/main.tsx
+++ b/src/renderer/main.tsx
@@ -1,6 +1,7 @@
 import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 
+import '@renderer/lib/prismSetup';
 import App from '@renderer/App';
 import '@renderer/styles.css';