Rename JSX files with proper .jsx extension (#23733)

app/javascript/mastodon/components/avatar_overlay.jsx

@@ -0,0 +1,51 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { autoPlayGif } from '../initial_state';
+import Avatar from './avatar';
+
+export default class AvatarOverlay extends React.PureComponent {
+
+  static propTypes = {
+    account: ImmutablePropTypes.map.isRequired,
+    friend: ImmutablePropTypes.map.isRequired,
+    animate: PropTypes.bool,
+    size: PropTypes.number,
+    baseSize: PropTypes.number,
+    overlaySize: PropTypes.number,
+  };
+
+  static defaultProps = {
+    animate: autoPlayGif,
+    size: 46,
+    baseSize: 36,
+    overlaySize: 24,
+  };
+
+  state = {
+    hovering: false,
+  };
+
+  handleMouseEnter = () => {
+    if (this.props.animate) return;
+    this.setState({ hovering: true });
+  };
+
+  handleMouseLeave = () => {
+    if (this.props.animate) return;
+    this.setState({ hovering: false });
+  };
+
+  render() {
+    const { account, friend, animate, size, baseSize, overlaySize } = this.props;
+    const { hovering } = this.state;
+
+    return (
+      <div className='account__avatar-overlay' style={{ width: size, height: size }}>
+        <div className='account__avatar-overlay-base'><Avatar animate={hovering || animate} account={account} size={baseSize} /></div>
+        <div className='account__avatar-overlay-overlay'><Avatar animate={hovering || animate} account={friend} size={overlaySize} /></div>
+      </div>
+    );
+  }
+
+}