feat(core): add getHandleConnections action (#1595)

* feat(core): add `getHandleConnections` action

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

* chore(changeset): add

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

---------

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

Author: bcakmakoglu

.changeset/twenty-snakes-hear.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": minor
+---
+
+Add `getHandleConnections` action to store.

packages/core/src/store/actions.ts

@@ -72,6 +72,10 @@ export function useActions(state: State, nodeLookup: ComputedRef<NodeLookup>, ed
     return getConnectedEdgesBase(nodesOrId, state.edges)
   }
 
+  const getHandleConnections: Actions['getHandleConnections'] = ({ id, type, nodeId }) => {
+    return Array.from(state.connectionLookup.get(`${nodeId}-${type}-${id ?? null}`)?.values() ?? [])
+  }
+
   const findNode: Actions['findNode'] = (id) => {
     if (!id) {
       return
@@ -880,6 +884,7 @@ export function useActions(state: State, nodeLookup: ComputedRef<NodeLookup>, ed
     getIncomers,
     getOutgoers,
     getConnectedEdges,
+    getHandleConnections,
     isNodeIntersecting,
     panBy,
     fitView: (params) => viewportHelper.value.fitView(params),

packages/core/src/types/store.ts

@@ -24,13 +24,14 @@ import type {
   ConnectionMode,
   ConnectionStatus,
   Connector,
+  HandleConnection,
 } from './connection'
 import type { DefaultEdgeOptions, Edge, EdgeUpdatable, GraphEdge } from './edge'
 import type { CoordinateExtent, CoordinateExtentRange, GraphNode, Node } from './node'
 import type { D3Selection, D3Zoom, D3ZoomHandler, PanOnScrollMode, ViewportTransform } from './zoom'
 import type { CustomEvent, FlowHooks, FlowHooksEmit, FlowHooksOn } from './hooks'
 import type { EdgeChange, NodeChange, NodeDragItem } from './changes'
-import type { ConnectingHandle, ValidConnectionFunc } from './handle'
+import type { ConnectingHandle, HandleType, ValidConnectionFunc } from './handle'
 
 export type NodeLookup = Map<string, GraphNode>
 
@@ -324,6 +325,8 @@ export interface Actions extends Omit<ViewportHelper, 'viewportInitialized'> {
   getOutgoers: (nodeOrId: Node | string) => GraphNode[]
   /** get a node's connected edges */
   getConnectedEdges: (nodesOrId: Node[] | string) => GraphEdge[]
+  /** get all connections of a handle belonging to a node */
+  getHandleConnections: ({ id, type, nodeId }: { id?: string | null; type: HandleType; nodeId: string }) => HandleConnection[]
   /** pan the viewport; return indicates if a transform has happened or not */
   panBy: (delta: XYPosition) => boolean
   /** viewport helper instance */