theme: new unified themes export

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/theme/src/compat/index.ts

@@ -15,5 +15,6 @@
  */
 
 export { UnifiedThemeProvider } from './UnifiedThemeProvider';
+export { themes } from './themes';
 export type { UnifiedThemeProviderProps } from './UnifiedThemeProvider';
 export type { UnifiedTheme } from './types';

packages/theme/src/compat/themes.ts

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2022 The Backstage Authors
+ *
+ * Licensed 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 { palettes } from '../base';
+import { createUnifiedTheme } from './UnifiedTheme';
+
+export const themes = {
+  light: createUnifiedTheme({ palette: palettes.light }),
+  dark: createUnifiedTheme({ palette: palettes.dark }),
+};