update: Color prop optional in MarkerDefinitions

src/utils/symbols.ts

@@ -0,0 +1,7 @@
+import { InjectionKey } from 'vue';
+import { RevueFlowStore } from '../types';
+import { RevueFlowHooks } from '../hooks/RevueFlowHooks';
+
+export const StoreKey: InjectionKey<RevueFlowStore> = Symbol('store');
+export const HooksKey: InjectionKey<RevueFlowHooks> = Symbol('hooks');
+export const NodeIdContextKey: InjectionKey<string> = Symbol('NodeIdContext');