Use null type for domRefs

D3 expects the empty value to be null, not undefined.
nextstrain · Nov 12, 2024 · aa30581 · aa30581
1 parent 5f4fe7e
commit aa30581
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/components/tree/tree.tsx b/src/components/tree/tree.tsx
@@ -36,8 +36,8 @@ export class TreeComponent extends React.Component<TreeComponentProps, TreeCompo
   constructor(props: TreeComponentProps) {
     super(props);
     this.domRefs = {
-      mainTree: undefined,
-      secondTree: undefined
+      mainTree: null,
+      secondTree: null
     };
     this.tangleRef = undefined;
     this.state = {