diff --git a/tests-ui/tests/issue-5033-type-compatibility.test.ts b/tests-ui/tests/issue-5033-type-compatibility.test.ts
new file mode 100644
index 0000000000..d8096f7fb7
--- /dev/null
+++ b/tests-ui/tests/issue-5033-type-compatibility.test.ts
@@ -0,0 +1,38 @@
+/**
+ * Test for issue #5033: Type compatibility between comfyui-frontend-types and @comfyorg/litegraph
+ *
+ * This test verifies that the generated types from this package can be used alongside
+ * external litegraph types without causing "#private field" conflicts.
+ */
+import { describe, expect, it } from 'vitest'
+
+import type { LGraph, LLink } from '@/lib/litegraph/src/litegraph'
+import type { ComfyApp } from '@/scripts/app'
+
+describe('Issue #5033: Type compatibility', () => {
+  it('should allow ComfyApp.graph to be assigned to LGraph type', () => {
+    // This test verifies that the types are compatible after removing #private fields
+    // from the generated .d.ts files
+
+    function getGraph(app: ComfyApp): LGraph {
+      // This should not cause TypeScript errors about #private field conflicts
+      return app.graph
+    }
+
+    // Type test - if this compiles, the issue is fixed
+    expect(typeof getGraph).toBe('function')
+  })
+
+  it('should allow graph.links to be compatible with LLink type', () => {
+    type LGraphFromApp = ComfyApp['graph']
+
+    function getLinks(app: ComfyApp): LLink | null {
+      const graph: LGraphFromApp = app.graph
+      // This should not cause TypeScript errors about #private field conflicts
+      return graph.links.get(0) ?? null
+    }
+
+    // Type test - if this compiles, the issue is fixed
+    expect(typeof getLinks).toBe('function')
+  })
+})
diff --git a/vite.types.config.mts b/vite.types.config.mts
index 531708909c..78e497e79c 100644
--- a/vite.types.config.mts
+++ b/vite.types.config.mts
@@ -18,7 +18,18 @@ export default defineConfig({
     dts({
       copyDtsFiles: true,
       rollupTypes: true,
-      tsconfigPath: 'tsconfig.types.json'
+      tsconfigPath: 'tsconfig.types.json',
+      beforeWriteFile: (filePath, content) => {
+        // Remove #private field declarations to prevent conflicts with external packages
+        // This fixes issue #5033 where #private fields cause type incompatibility
+        const cleanedContent = content
+          .replace(/\s*#private;\s*/g, '') // Remove "#private;" declarations
+          .replace(/\s*#[a-zA-Z_$][a-zA-Z0-9_$]*\s*:\s*[^;]+;\s*/g, '') // Remove full private field declarations
+        return {
+          filePath,
+          content: cleanedContent
+        }
+      }
     })
   ]
 })