fix: type issue

tldraw/packages/react/src/lib/TLReactApp.ts

@@ -3,5 +3,5 @@ import type { TLReactShape } from './TLReactShape'
 import type { TLReactEventMap } from '~types'
 
 export class TLReactApp<S extends TLReactShape = TLReactShape> extends TLApp<S, TLReactEventMap> {
-    pubEvent: any
+    pubEvent?: any
 }