Make AbstractSource _nativeRef compatible

.gitignore

@@ -53,6 +53,9 @@ node_modules
 package-lock.json
 /example/package-lock.json
 
+# Expo
+.expo
+
 # OS X
 .DS_Store
 

__tests__/utils/animated/AnimatedCoordinatesArray.test.js

@@ -46,7 +46,7 @@ describe('AnimatedShapeSource', () => {
       />,
     );
     const setNativeProps = jest.fn();
-    shapeSourceRef._component.refs.nativeSource.setNativeProps = setNativeProps;
+    shapeSourceRef._component._nativeRef.setNativeProps = setNativeProps;
 
     coordinates
       .timing({
@@ -95,7 +95,7 @@ describe('AnimatedShapeSource', () => {
       />,
     );
     const setNativeProps = jest.fn();
-    shapeSourceRef._component.refs.nativeSource.setNativeProps = setNativeProps;
+    shapeSourceRef._component._nativeRef.setNativeProps = setNativeProps;
 
     coordinates
       .timing({
@@ -147,7 +147,7 @@ describe('AnimatedShapeSource', () => {
       />,
     );
     const setNativeProps = jest.fn();
-    shapeSourceRef._component.refs.nativeSource.setNativeProps = setNativeProps;
+    shapeSourceRef._component._nativeRef.setNativeProps = setNativeProps;
 
     coordinates
       .timing({

javascript/components/AbstractSource.js

@@ -2,8 +2,12 @@ import React from 'react';
 
 class AbstractSource extends React.PureComponent {
   setNativeProps(props) {
-    if (this.refs.nativeSource) {
-      this.refs.nativeSource.setNativeProps(props);
+    if (this._nativeRef) {
+      this._nativeRef.setNativeProps(props);
+    } else {
+      if (this.refs.nativeSource) {
+        this.refs.nativeSource.setNativeProps(props);
+      }
     }
   }
 }

javascript/components/ShapeSource.js

@@ -208,7 +208,7 @@ class ShapeSource extends NativeBridgeComponent(AbstractSource) {
     };
 
     return (
-      <RCTMGLShapeSource ref="nativeSource" {...props}>
+      <RCTMGLShapeSource {...props}>
         {cloneReactChildrenWithProps(this.props.children, {
           sourceID: this.props.id,
         })}