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

app/javascript/mastodon/components/button.jsx

@@ -0,0 +1,57 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+
+export default class Button extends React.PureComponent {
+
+  static propTypes = {
+    text: PropTypes.node,
+    type: PropTypes.string,
+    onClick: PropTypes.func,
+    disabled: PropTypes.bool,
+    block: PropTypes.bool,
+    secondary: PropTypes.bool,
+    className: PropTypes.string,
+    title: PropTypes.string,
+    children: PropTypes.node,
+  };
+
+  static defaultProps = {
+    type: 'button',
+  };
+
+  handleClick = (e) => {
+    if (!this.props.disabled && this.props.onClick) {
+      this.props.onClick(e);
+    }
+  };
+
+  setRef = (c) => {
+    this.node = c;
+  };
+
+  focus() {
+    this.node.focus();
+  }
+
+  render () {
+    const className = classNames('button', this.props.className, {
+      'button-secondary': this.props.secondary,
+      'button--block': this.props.block,
+    });
+
+    return (
+      <button
+        className={className}
+        disabled={this.props.disabled}
+        onClick={this.handleClick}
+        ref={this.setRef}
+        title={this.props.title}
+        type={this.props.type}
+      >
+        {this.props.text || this.props.children}
+      </button>
+    );
+  }
+
+}