Update refs

Author: vasturiano

example/camera-auto-orbit/index.html

@@ -21,7 +21,7 @@
     const distance = 1400;
 
     const CameraOrbit = () => {
-      const fgRef = useRef(null);
+      const fgRef = useRef();
 
       useEffect(() => {
         fgRef.current.cameraPosition({ z: distance });

example/click-to-focus/index.html

@@ -17,7 +17,7 @@
 
     fetch('../datasets/miserables.json').then(res => res.json()).then(data => {
       const FocusGraph = () => {
-        const fgRef = useRef(null);
+        const fgRef = useRef();
 
         const handleClick = useCallback(node => {
           // Aim at node from outside it

example/collision-detection/index.html

@@ -19,7 +19,7 @@
     const { useState, useEffect, useRef } = React;
 
     const CollisionDetectionFG = () => {
-      const fgRef = useRef(null);
+      const fgRef = useRef();
 
       const [graphData, setGraphData] = useState({ nodes: [], links: [] });
 

example/dynamic/index.html

@@ -17,7 +17,7 @@
 
     const DynamicGraph = () => {
       const [data, setData] = useState({ nodes: [{ id: 0 }], links: [] });
-      const fgRef = useRef(null);
+      const fgRef = useRef();
 
       useEffect(() => {
         setInterval(() => {

example/tree/index.html

@@ -26,7 +26,7 @@
     };
 
     const ForceTree = ({ data }) => {
-      const fgRef = useRef(null);
+      const fgRef = useRef();
 
       const [controls] = useState({ 'DAG Orientation': 'td'});
       const forceUpdate = useForceUpdate();