SIP-32: Moving frontend code to the base of the repo (#9098)

* move assets out, get webpack dev working

* update docs to reference superset-frontend

* draw the rest of the owl

* fix docs

* fix webpack script

* rats

* correct docs

* fix tox dox

superset-frontend/src/SqlLab/components/TabStatusIcon.jsx

@@ -0,0 +1,60 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const propTypes = {
+  onClose: PropTypes.func.isRequired,
+  tabState: PropTypes.string.isRequired,
+};
+
+class TabStatusIcon extends React.Component {
+  constructor(props) {
+    super(props);
+    this.onMouseOver = this.onMouseOver.bind(this);
+    this.onMouseOut = this.onMouseOut.bind(this);
+
+    this.state = { isHovered: false };
+  }
+
+  onMouseOver() {
+    this.setState({ isHovered: true });
+  }
+
+  onMouseOut() {
+    this.setState({ isHovered: false });
+  }
+
+  render() {
+    return (
+      <span
+        onMouseOver={this.onMouseOver}
+        onMouseOut={this.onMouseOut}
+        onClick={this.props.onClose}
+      >
+        <div className={'circle ' + this.props.tabState}>
+          {this.state.isHovered ? '×' : null}
+        </div>
+      </span>
+    );
+  }
+}
+
+TabStatusIcon.propTypes = propTypes;
+export default TabStatusIcon;