Developer design a permissions dialog

src/utils/iterables.ts

@@ -14,8 +14,12 @@
  * limitations under the License.
  */
 
-import { arrayUnion } from "./arrays";
+import { arrayDiff, arrayUnion } from "./arrays";
 
 export function iterableUnion<T>(a: Iterable<T>, b: Iterable<T>): Iterable<T> {
     return arrayUnion(Array.from(a), Array.from(b));
 }
+
+export function iterableDiff<T>(a: Iterable<T>, b: Iterable<T>): { added: Iterable<T>, removed: Iterable<T> } {
+    return arrayDiff(Array.from(a), Array.from(b));
+}