From c3c23ea16a35658ac59a866bd18cf0a4420a0053 Mon Sep 17 00:00:00 2001
From: Ross Keenan <rossk29@gmail.com>
Date: Fri, 13 Aug 2021 11:27:43 +0200
Subject: [PATCH] fix: :bug: mergeGs was trying to copy the first graph in an
 arr of graphs, but that arr could be empty

---
 src/sharedFunctions.ts | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/src/sharedFunctions.ts b/src/sharedFunctions.ts
index ceea7141..f621d4e8 100644
--- a/src/sharedFunctions.ts
+++ b/src/sharedFunctions.ts
@@ -1,4 +1,4 @@
-import type { Graph } from "graphlib";
+import { Graph } from "graphlib";
 import * as graphlib from "graphlib";
 import { parseTypedLink } from "juggl-api";
 import {
@@ -450,15 +450,13 @@ export function mergeGraphs(g1: Graph, g2: Graph) {
 }
 
 export function mergeGs(...graphs: Graph[]) {
-  const copy = graphlib.json.read(graphlib.json.write(graphs[0]));
-  graphs.forEach((graph, i) => {
-    if (i > 0) {
-      graph.edges().forEach((edge) => {
-        copy.setEdge(edge);
-      });
-    }
+  const outG = new Graph();
+  graphs.forEach((graph) => {
+    graph.edges().forEach((edge) => {
+      outG.setEdge(edge);
+    });
   });
-  return copy;
+  return outG;
 }
 
 export function removeUnlinkedNodes(g: Graph) {