SharedElement is a simple View on iOS

src/views/sharedElementTransition.js → src/views/sharedElementTransition.android.js

 
 const SharedElementTransitionModule = requireNativeComponent('SharedElementTransition', null);
 
-export default class SharedElementTransition extends React.Component {
+export default class SharedElementTransition extends Component {
   render() {
     return <SharedElementTransitionModule {...this.props} />;
   }

src/views/sharedElementTransition.ios.js

+import React, {Component, View} from 'react';
+import {
+  requireNativeComponent
+} from 'react-native';
+
+export default class SharedElementTransition extends Component {
+  render() {
+    return <View />;
+  }
+}