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

app/javascript/mastodon/components/avatar.jsx

@@ -0,0 +1,62 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { autoPlayGif } from '../initial_state';
+import classNames from 'classnames';
+
+export default class Avatar extends React.PureComponent {
+
+  static propTypes = {
+    account: ImmutablePropTypes.map,
+    size: PropTypes.number.isRequired,
+    style: PropTypes.object,
+    inline: PropTypes.bool,
+    animate: PropTypes.bool,
+  };
+
+  static defaultProps = {
+    animate: autoPlayGif,
+    size: 20,
+    inline: false,
+  };
+
+  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, size, animate, inline } = this.props;
+    const { hovering } = this.state;
+
+    const style = {
+      ...this.props.style,
+      width: `${size}px`,
+      height: `${size}px`,
+    };
+
+    let src;
+
+    if (hovering || animate) {
+      src = account?.get('avatar');
+    } else {
+      src = account?.get('avatar_static');
+    }
+
+    return (
+      <div className={classNames('account__avatar', { 'account__avatar-inline': inline })} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} style={style}>
+        {src && <img src={src} alt={account?.get('acct')} />}
+      </div>
+    );
+  }
+
+}