refactor(svelte): replace on:connect with onconnect

examples/svelte/src/routes/examples/add-node-on-drop/Flow.svelte

@@ -1,6 +1,12 @@
 <script lang="ts">
 	import { writable } from 'svelte/store';
-	import { SvelteFlow, useSvelteFlow, type Edge, type Node } from '@xyflow/svelte';
+	import {
+		SvelteFlow,
+		useSvelteFlow,
+		type Edge,
+		type Node,
+		type OnConnectEnd
+	} from '@xyflow/svelte';
 
 	import '@xyflow/svelte/dist/style.css';
 
@@ -16,16 +22,18 @@
 	const nodes = writable<Node[]>(initialNodes);
 	const edges = writable<Edge[]>([]);
 
-	let connectingNodeId: string = '0';
+	let connectingNodeId: string | null = '0';
 	let rect: DOMRectReadOnly;
 	let id = 1;
 	const getId = () => `${id++}`;
 
 	const { screenToFlowPosition, flowToScreenPosition } = useSvelteFlow();
 
-	function handleConnectEnd({ detail: { event } }: { detail: { event: MouseEvent | TouchEvent } }) {
+	const handleConnectEnd: OnConnectEnd = (event) => {
+		if (!connectingNodeId) return;
+
 		// See of connection landed inside the flow pane
-		const targetIsPane = event.target?.classList.contains('svelte-flow__pane');
+		const targetIsPane = (event.target as HTMLDivElement)?.classList.contains('svelte-flow__pane');
 		if (targetIsPane) {
 			const id = getId();
 			const position = {
@@ -58,7 +66,7 @@
 			$nodes = $nodes;
 			$edges = $edges;
 		}
-	}
+	};
 </script>
 
 <svelte:window />
@@ -69,11 +77,11 @@
 		{edges}
 		fitView
 		fitViewOptions={{ padding: 2 }}
-		on:connectstart={({ detail: { nodeId } }) => {
+		onconnectstart={(_, { nodeId }) => {
 			// Memorize the nodeId you start draggin a connection line from a node
 			connectingNodeId = nodeId;
 		}}
-		on:connectend={handleConnectEnd}
+		onconnectend={handleConnectEnd}
 	/>
 </div>
 

examples/svelte/src/routes/examples/customnode/+page.svelte

@@ -87,7 +87,7 @@
 	{nodeTypes}
 	style="--xy-background-color: {$bgColor}"
 	fitView
-	on:connect={onConnect}
+	onconnect={onConnect}
 >
 	<Controls />
 	<Background variant={BackgroundVariant.Dots} />

examples/svelte/src/routes/examples/customnode/CustomNode.svelte

@@ -10,7 +10,7 @@
 </script>
 
 <div class="custom">
-	<Handle type="target" position={Position.Left} on:connect />
+	<Handle type="target" position={Position.Left} />
 	<div>
 		Custom Color Picker Node: <strong>{$colorStore}</strong>
 	</div>
@@ -20,14 +20,8 @@
 		on:input={(evt) => colorStore.set(evt.currentTarget.value)}
 		value={$colorStore}
 	/>
-	<Handle type="source" position={Position.Right} id="a" style="top: 20px;" on:connect />
-	<Handle
-		type="source"
-		position={Position.Right}
-		id="b"
-		style="top: auto; bottom: 10px;"
-		on:connect
-	/>
+	<Handle type="source" position={Position.Right} id="a" style="top: 20px;" />
+	<Handle type="source" position={Position.Right} id="b" style="top: auto; bottom: 10px;" />
 </div>
 
 <style>

examples/svelte/src/routes/examples/overview/+page.svelte

@@ -150,9 +150,9 @@
 	on:nodemouseenter={(event) => console.log('on node enter', event)}
 	on:nodemouseleave={(event) => console.log('on node leave', event)}
 	on:edgeclick={(event) => console.log('edge click', event)}
-	on:connectstart={(event) => console.log('on connect start', event)}
-	on:connect={(event) => console.log('on connect', event)}
-	on:connectend={(event) => console.log('on connect end', event)}
+	onconnectstart={(event) => console.log('on connect start', event)}
+	onconnect={(event) => console.log('on connect', event)}
+	onconnectend={(event) => console.log('on connect end', event)}
 	on:paneclick={(event) => console.log('on pane click', event)}
 	on:panecontextmenu={(event) => {
 		console.log('on pane contextmenu', event);

examples/svelte/src/routes/examples/usenodesdata/UppercaseNode.svelte

@@ -2,10 +2,10 @@
 	import {
 		Handle,
 		Position,
-		type NodeProps,
 		useHandleConnections,
 		useNodesData,
-		useSvelteFlow
+		useSvelteFlow,
+		type NodeProps
 	} from '@xyflow/svelte';
 
 	type $$Props = NodeProps;

examples/svelte/src/routes/examples/useupdatenodeinternals/CustomNode.svelte

@@ -15,15 +15,9 @@
 	};
 </script>
 
-<Handle type="target" position={Position.Top} on:connect />
+<Handle type="target" position={Position.Top} />
 <button on:click={onClick}>add handle</button>
 
 {#each Array.from({ length: handleCount }) as handle, i}
-	<Handle
-		type="source"
-		position={Position.Bottom}
-		id={`${i}`}
-		style={`left: ${i * 10}px;`}
-		on:connect
-	/>
+	<Handle type="source" position={Position.Bottom} id={`${i}`} style={`left: ${i * 10}px;`} />
 {/each}

packages/svelte/src/lib/components/Handle/Handle.svelte

@@ -1,19 +1,18 @@
 <script lang="ts">
-  import { getContext, createEventDispatcher } from 'svelte';
+  import { getContext } from 'svelte';
+  import type { Writable } from 'svelte/store';
   import cc from 'classcat';
   import {
     Position,
     XYHandle,
     isMouseEvent,
     type Connection,
-    type HandleType,
     areConnectionMapsEqual,
     handleConnectionChange
   } from '@xyflow/system';
 
   import { useStore } from '$lib/store';
   import type { HandleComponentProps } from '$lib/types';
-  import type { Writable } from 'svelte/store';
 
   type $$Props = HandleComponentProps;
 
@@ -36,18 +35,6 @@
   $: handleConnectable = isConnectable !== undefined ? isConnectable : $connectable;
 
   const handleId = id || null;
-  const dispatch = createEventDispatcher<{
-    connect: { connection: Connection };
-    connectstart: {
-      event: MouseEvent | TouchEvent;
-      nodeId: string | null;
-      handleId: string | null;
-      handleType: HandleType | null;
-    };
-    connectend: {
-      event: MouseEvent | TouchEvent;
-    };
-  }>();
 
   const store = useStore();
   const {
@@ -65,7 +52,10 @@
     updateConnection,
     autoPanOnConnect,
     edges,
-    connectionLookup
+    connectionLookup,
+    onconnect: onConnectAction,
+    onconnectstart: onConnectStartAction,
+    onconnectend: onConnectEndAction
   } = store;
 
   function onPointerDown(event: MouseEvent | TouchEvent) {
@@ -94,20 +84,17 @@
           }
 
           addEdge(edge);
-          // @todo: should we change/ improve the stuff we are passing here?
-          // instead of source/target we could pass fromNodeId, fromHandleId, etc
-          dispatch('connect', { connection });
+          $onConnectAction?.(connection);
         },
         onConnectStart: (event, startParams) => {
-          dispatch('connectstart', {
-            event,
+          $onConnectStartAction?.(event, {
             nodeId: startParams.nodeId,
             handleId: startParams.handleId,
             handleType: startParams.handleType
           });
         },
         onConnectEnd: (event) => {
-          dispatch('connectend', { event });
+          $onConnectEndAction?.(event);
         },
         getTransform: () => [$viewport.x, $viewport.y, $viewport.zoom]
       });

packages/svelte/src/lib/components/NodeWrapper/NodeWrapper.svelte

@@ -194,9 +194,6 @@
       positionAbsolute={{ x: positionX, y: positionY }}
       {width}
       {height}
-      on:connectstart
-      on:connect
-      on:connectend
     />
   </div>
 {/if}

packages/svelte/src/lib/components/nodes/DefaultNode.svelte

@@ -37,6 +37,6 @@
   isConnectable;
 </script>
 
-<Handle type="target" position={targetPosition} on:connectstart on:connect on:connectend />
+<Handle type="target" position={targetPosition} />
 {data?.label}
-<Handle type="source" position={sourcePosition} on:connectstart on:connect on:connectend />
+<Handle type="source" position={sourcePosition} />

packages/svelte/src/lib/components/nodes/InputNode.svelte

@@ -39,4 +39,4 @@
 </script>
 
 {data?.label}
-<Handle type="source" position={sourcePosition} on:connectstart on:connect on:connectend />
+<Handle type="source" position={sourcePosition} />

packages/svelte/src/lib/components/nodes/OutputNode.svelte

@@ -36,4 +36,4 @@
 </script>
 
 {data?.label}
-<Handle type="target" position={targetPosition} on:connectstart on:connect on:connectend />
+<Handle type="target" position={targetPosition} />

packages/svelte/src/lib/container/NodeRenderer/NodeRenderer.svelte

@@ -83,9 +83,6 @@
       on:nodemouseenter
       on:nodemousemove
       on:nodemouseleave
-      on:connectstart
-      on:connect
-      on:connectend
       on:nodedrag
       on:nodedragstart
       on:nodedragstop

packages/svelte/src/lib/container/SvelteFlow/SvelteFlow.svelte

@@ -78,6 +78,9 @@
   export let width: $$Props['width'] = undefined;
   export let height: $$Props['height'] = undefined;
   export let colorMode: $$Props['colorMode'] = 'light';
+  export let onconnect: $$Props['onconnect'] = undefined;
+  export let onconnectstart: $$Props['onconnectstart'] = undefined;
+  export let onconnectend: $$Props['onconnectend'] = undefined;
 
   export let defaultMarkerColor = '#b1b1b7';
 
@@ -152,7 +155,10 @@
       ondelete,
       onedgecreate,
       connectionMode,
-      nodeDragThreshold
+      nodeDragThreshold,
+      onconnect,
+      onconnectstart,
+      onconnectend
     };
 
     updateStoreByKeys(store, updatableProps);
@@ -217,9 +223,6 @@
           on:nodemouseenter
           on:nodemousemove
           on:nodemouseleave
-          on:connectstart
-          on:connect
-          on:connectend
           on:nodedragstart
           on:nodedrag
           on:nodedragstop

packages/svelte/src/lib/container/SvelteFlow/types.ts

@@ -15,7 +15,10 @@ import type {
   ConnectionMode,
   PanelPosition,
   ProOptions,
-  ColorMode
+  ColorMode,
+  OnConnect,
+  OnConnectStart,
+  OnConnectEnd
 } from '@xyflow/system';
 
 import type {
@@ -92,4 +95,8 @@ export type SvelteFlowProps = DOMAttributes<HTMLDivElement> & {
   ondelete?: OnDelete;
 
   onedgecreate?: OnEdgeCreate;
+
+  onconnect?: OnConnect;
+  onconnectstart?: OnConnectStart;
+  onconnectend?: OnConnectEnd;
 };

packages/svelte/src/lib/container/SvelteFlow/utils.ts

@@ -66,6 +66,9 @@ export type UpdatableStoreProps = {
   ondelete?: UnwrapWritable<SvelteFlowStore['ondelete']>;
   onedgecreate?: UnwrapWritable<SvelteFlowStore['onedgecreate']>;
   nodeDragThreshold?: UnwrapWritable<SvelteFlowStore['nodeDragThreshold']>;
+  onconnect?: UnwrapWritable<SvelteFlowStore['onconnect']>;
+  onconnectstart?: UnwrapWritable<SvelteFlowStore['onconnectstart']>;
+  onconnectend?: UnwrapWritable<SvelteFlowStore['onconnectend']>;
 };
 
 export function updateStoreByKeys(store: SvelteFlowStore, keys: UpdatableStoreProps) {

packages/svelte/src/lib/store/initial-store.ts

@@ -19,7 +19,10 @@ import {
   getNodesBounds,
   getViewportForBounds,
   updateConnectionLookup,
-  type ConnectionLookup
+  type ConnectionLookup,
+  type OnConnect,
+  type OnConnectStart,
+  type OnConnectEnd
 } from '@xyflow/system';
 
 import DefaultNode from '$lib/components/nodes/DefaultNode.svelte';
@@ -140,6 +143,9 @@ export const getInitialStore = ({
     onlyRenderVisibleElements: writable<boolean>(false),
     onerror: writable<OnError>(devWarn),
     ondelete: writable<OnDelete>(undefined),
-    onedgecreate: writable<OnEdgeCreate>(undefined)
+    onedgecreate: writable<OnEdgeCreate>(undefined),
+    onconnect: writable<OnConnect>(undefined),
+    onconnectstart: writable<OnConnectStart>(undefined),
+    onconnectend: writable<OnConnectEnd>(undefined)
   };
 };