refactor(core): separate model and store watchers

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

packages/core/src/store/state.ts

@@ -1,4 +1,3 @@
-import { createHooks } from './hooks'
 import type { DefaultEdgeTypes, DefaultNodeTypes, FlowOptions, State } from '~/types'
 import { ConnectionLineType, ConnectionMode, PanOnScrollMode } from '~/types'
 import {
@@ -26,8 +25,6 @@ export const defaultEdgeTypes: DefaultEdgeTypes = {
   simplebezier: SimpleBezierEdge,
 }
 
-const isDef = <T>(val: T): val is NonNullable<T> => typeof val !== 'undefined'
-
 const defaultState = (): State => ({
   vueFlowRef: null,
   viewportRef: null,