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node_modules/react-smooth/src/AnimateGroup.js

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+import React, { Children } from 'react';
+import { TransitionGroup } from 'react-transition-group';
+import PropTypes from 'prop-types';
+import AnimateGroupChild from './AnimateGroupChild';
+
+function AnimateGroup(props) {
+  const { component, children, appear, enter, leave } = props;
+
+  return (
+    <TransitionGroup component={component}>
+      {Children.map(children, (child, index) => (
+        <AnimateGroupChild
+          appearOptions={appear}
+          enterOptions={enter}
+          leaveOptions={leave}
+            key={`child-${index}`} // eslint-disable-line
+        >
+          {child}
+        </AnimateGroupChild>
+      ))}
+    </TransitionGroup>
+  );
+}
+
+AnimateGroup.propTypes = {
+  appear: PropTypes.object,
+  enter: PropTypes.object,
+  leave: PropTypes.object,
+  children: PropTypes.oneOfType([PropTypes.array, PropTypes.element]),
+  component: PropTypes.any,
+};
+
+AnimateGroup.defaultProps = {
+  component: 'span',
+};
+
+export default AnimateGroup;