add search-common package

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>

packages/search-common/src/index.ts

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+/*
+ * Copyright 2021 Spotify AB
+ *
+ * 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.
+ */
+export * from './types';

packages/search-common/src/types.ts

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+/*
+ * Copyright 2021 Spotify AB
+ *
+ * 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 { JsonObject } from '@backstage/config';
+import { IndexableDocument } from '@backstage/plugin-search-indexer-backend';
+
+export interface SearchQuery {
+  term: string;
+  filters?: JsonObject;
+  pageCursor: string;
+}
+
+export interface SearchResult {
+  document: IndexableDocument;
+}
+
+export interface SearchResultSet {
+  results: SearchResult[];
+}