Deduplicate join rule management between rooms and spaces

src/hooks/useLocalEcho.ts

@@ -0,0 +1,36 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+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 { useState } from "react";
+
+export const useLocalEcho = <T extends any>(
+    currentFactory: () => T,
+    setterFn: (value: T) => Promise<unknown>,
+    errorFn: (error: Error) => void,
+): [value: T, handler: (value: T) => void] => {
+    const [value, setValue] = useState(currentFactory);
+    const handler = async (value: T) => {
+        setValue(value);
+        try {
+            await setterFn(value);
+        } catch (e) {
+            setValue(currentFactory());
+            errorFn(e);
+        }
+    };
+
+    return [value, handler];
+};