fix: getNodeIdsConnected should remove duplicate values

packages/core/graph/src/AdjacencyList.js

@@ -439,14 +439,18 @@ export default class AdjacencyList<TEdgeType: number = 1> {
       (Array.isArray(type)
         ? type.includes(this.#nodes.typeOf(node))
         : type === this.#nodes.typeOf(node));
-
     let nodes = [];
+    let seen = new Set<NodeId>();
     let node = this.#nodes.head(from);
     while (node !== null) {
       if (matches(node)) {
         let edge = this.#nodes.firstOut(node);
         while (edge !== null) {
-          nodes.push(this.#edges.to(edge));
+          let to = this.#edges.to(edge);
+          if (!seen.has(to)) {
+            nodes.push(to);
+            seen.add(to);
+          }
           edge = this.#edges.nextOut(edge);
         }
       }
@@ -473,12 +477,17 @@ export default class AdjacencyList<TEdgeType: number = 1> {
         : type === this.#nodes.typeOf(node));
 
     let nodes = [];
+    let seen = new Set<NodeId>();
     let node = this.#nodes.head(to);
     while (node !== null) {
       if (matches(node)) {
         let edge = this.#nodes.firstIn(node);
         while (edge !== null) {
-          nodes.push(this.#edges.from(edge));
+          let from = this.#edges.from(edge);
+          if (!seen.has(from)) {
+            nodes.push(from);
+            seen.add(from);
+          }
           edge = this.#edges.nextIn(edge);
         }
       }

packages/core/graph/test/AdjacencyList.test.js

@@ -57,6 +57,18 @@ describe('AdjacencyList', () => {
     assert.deepEqual(graph.getNodeIdsConnectedTo(node1), [0, 2, 4, 5, 6]);
   });
 
+  it('getNodeIdsConnectedTo and getNodeIdsConnectedFrom should remove duplicate values', () => {
+    let graph = new AdjacencyList();
+    let a = graph.addNode();
+    let b = graph.addNode();
+    let c = graph.addNode();
+    graph.addEdge(a, b);
+    graph.addEdge(a, c);
+    graph.addEdge(a, b, 2);
+    assert.deepEqual(graph.getNodeIdsConnectedFrom(a, -1), [b, c]);
+    assert.deepEqual(graph.getNodeIdsConnectedTo(b, -1), [a]);
+  });
+
   it('removeEdge should remove an edge of a specific type from the graph', () => {
     let graph = new AdjacencyList();
     let a = graph.addNode();