fix issue #5012 - Cannot read property 'declarations' of null (#5019)

- temporary fix

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/destructure/actual.js

@@ -0,0 +1,10 @@
+class AnchorLink extends Component {
+  render() {
+    const { isExternal, children } = this.props;
+    if (isExternal) {
+      return (<a>{children}</a>);
+    }
+
+    return (<Link>{children}</Link>);
+  }
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/destructure/expected.js

@@ -0,0 +1,13 @@
+class AnchorLink extends Component {
+  render() {
+    var _props = this.props;
+    const isExternal = _props.isExternal,
+          children = _props.children;
+
+    if (isExternal) {
+      return <a>{children}</a>;
+    }
+
+    return <Link>{children}</Link>;
+  }
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/destructure/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "syntax-jsx",
+    "transform-es2015-destructuring",
+    "transform-react-constant-elements"
+  ]
+}