Find as clean architecture

src/background/repositories/find.js

@@ -0,0 +1,18 @@
+import MemoryStorage from '../infrastructures/memory-storage';
+
+const FIND_KEYWORD_KEY = 'find-keyword';
+
+export default class FindRepository {
+  constructor() {
+    this.cache = new MemoryStorage();
+  }
+
+  getKeyword() {
+    return Promise.resolve(this.cache.get(FIND_KEYWORD_KEY));
+  }
+
+  setKeyword(keyword) {
+    return this.cache.set(FIND_KEYWORD_KEY, keyword);
+  }
+}
+