diff --git a/packages/runtime-vapor/src/apiDefineComponent.ts b/packages/runtime-vapor/src/apiDefineComponent.ts
new file mode 100644
index 000000000..aeeb3ff72
--- /dev/null
+++ b/packages/runtime-vapor/src/apiDefineComponent.ts
@@ -0,0 +1,5 @@
+// TODO
+/*! #__NO_SIDE_EFFECTS__ */
+export function defineComponent(comp: any) {
+  return comp
+}
diff --git a/packages/runtime-vapor/src/index.ts b/packages/runtime-vapor/src/index.ts
index fbf769ffe..3e3fb53e9 100644
--- a/packages/runtime-vapor/src/index.ts
+++ b/packages/runtime-vapor/src/index.ts
@@ -50,6 +50,7 @@ export * from './dom'
 export * from './apiLifecycle'
 export * from './if'
 export * from './for'
+export { defineComponent } from './apiDefineComponent'
 
 export * from './directives/vShow'
 export * from './directives/vModel'