WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/TouchEventUtils.js.flow

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule TouchEventUtils
+ */
+const TouchEventUtils = {
+  /**
+   * Utility function for common case of extracting out the primary touch from a
+   * touch event.
+   * - `touchEnd` events usually do not have the `touches` property.
+   *   http://stackoverflow.com/questions/3666929/
+   *   mobile-sarai-touchend-event-not-firing-when-last-touch-is-removed
+   *
+   * @param {Event} nativeEvent Native event that may or may not be a touch.
+   * @return {TouchesObject?} an object with pageX and pageY or null.
+   */
+  extractSingleTouch: function (nativeEvent) {
+    const touches = nativeEvent.touches;
+    const changedTouches = nativeEvent.changedTouches;
+    const hasTouches = touches && touches.length > 0;
+    const hasChangedTouches = changedTouches && changedTouches.length > 0;
+    return !hasTouches && hasChangedTouches ? changedTouches[0] : hasTouches ? touches[0] : nativeEvent;
+  }
+};
+module.exports = TouchEventUtils;