support instance without props

app/canvas/shared/copy-paste.ts

@@ -8,8 +8,8 @@ import { cloneInstance } from "~/shared/tree-utils";
 import { cloneProps } from "~/shared/props-utils";
 import { publish } from "./pubsub";
 
-let currentInstance: Instance;
-let currentProps: InstanceProps;
+let currentInstance: Instance | undefined;
+let currentProps: InstanceProps | undefined;
 
 export const copy = () => {
   if (selectedInstanceContainer.value === undefined) return;
@@ -20,11 +20,14 @@ export const copy = () => {
 export const paste = () => {
   if (currentInstance === undefined) return;
   const instance = cloneInstance(currentInstance);
-  publish<"insertInstance", { instance: Instance; props: InstanceProps }>({
+  const props = currentProps
+    ? cloneProps(currentProps, { instanceId: instance.id })
+    : undefined;
+  publish<"insertInstance", { instance: Instance; props?: InstanceProps }>({
     type: "insertInstance",
     payload: {
       instance,
-      props: cloneProps(currentProps, { instanceId: instance.id }),
+      props,
     },
   });
 };