update

vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['test/**/*.test.{ts,tsx}'],
+    // The renderer modules under test (diff, fuzzy, highlight) are DOM-free.
+    globals: false,
+  },
+})