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/spec/javascripts/dashboard/util/dnd-reorder_spec.js

@@ -0,0 +1,77 @@
+/**
+ * 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 reorderItem from '../../../../src/dashboard/util/dnd-reorder';
+
+describe('dnd-reorderItem', () => {
+  it('should remove the item from its source entity and add it to its destination entity', () => {
+    const result = reorderItem({
+      entitiesMap: {
+        a: {
+          id: 'a',
+          children: ['x', 'y', 'z'],
+        },
+        b: {
+          id: 'b',
+          children: ['banana'],
+        },
+      },
+      source: { id: 'a', index: 2 },
+      destination: { id: 'b', index: 1 },
+    });
+
+    expect(result.a.children).toEqual(['x', 'y']);
+    expect(result.b.children).toEqual(['banana', 'z']);
+  });
+
+  it('should correctly move elements within the same list', () => {
+    const result = reorderItem({
+      entitiesMap: {
+        a: {
+          id: 'a',
+          children: ['x', 'y', 'z'],
+        },
+      },
+      source: { id: 'a', index: 2 },
+      destination: { id: 'a', index: 0 },
+    });
+
+    expect(result.a.children).toEqual(['z', 'x', 'y']);
+  });
+
+  it('should copy items that do not move into the result', () => {
+    const extraEntity = {};
+    const result = reorderItem({
+      entitiesMap: {
+        a: {
+          id: 'a',
+          children: ['x', 'y', 'z'],
+        },
+        b: {
+          id: 'b',
+          children: ['banana'],
+        },
+        iAmExtra: extraEntity,
+      },
+      source: { id: 'a', index: 2 },
+      destination: { id: 'b', index: 1 },
+    });
+
+    expect(result.iAmExtra === extraEntity).toBe(true);
+  });
+});