yeet

node_modules/react-native/Libraries/__flowtests__/ReactNativeTypes-flowtest.js

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+import * as React from 'react';
+import type {HostComponent} from '../Renderer/shims/ReactNativeTypes';
+
+function takesHostComponentInstance(
+  instance: React.ElementRef<HostComponent<mixed>> | null,
+): void {}
+
+const MyHostComponent = (('Host': any): HostComponent<mixed>);
+
+<MyHostComponent
+  ref={hostComponentRef => {
+    takesHostComponentInstance(hostComponentRef);
+
+    if (hostComponentRef == null) {
+      return;
+    }
+
+    hostComponentRef.measureLayout(hostComponentRef, () => {});
+  }}
+/>;