[fix] prevent findNodeHandle throwing on unmounted components

Fix #1097

packages/react-native-web/src/exports/findNodeHandle/index.js

@@ -8,4 +8,15 @@
  */
 
 import { findDOMNode } from 'react-dom';
-export default findDOMNode;
+
+const findNodeHandle = component => {
+  let node;
+
+  try {
+    node = findDOMNode(component);
+  } catch (e) {}
+
+  return node;
+};
+
+export default findNodeHandle;

packages/react-native-web/src/modules/NativeMethodsMixin/index.js

@@ -100,12 +100,14 @@ const NativeMethodsMixin = {
       return;
     }
     const node = findNodeHandle(this);
-    // Next state is determined by comparison to existing state (in the DOM).
+    if (node) {
-    // Existing state has already gone through i18n transform
+      // Next state is determined by comparison to existing state (in the DOM).
-    const domProps = createDOMProps(null, nativeProps, style =>
+      // Existing state has already gone through i18n transform
-      styleResolver.resolveWithNode(style, node)
+      const domProps = createDOMProps(null, nativeProps, style =>
-    );
+        styleResolver.resolveWithNode(style, node)
-    UIManager.updateView(node, domProps, this);
+      );
+      UIManager.updateView(node, domProps, this);
+    }
   }
 };