| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 { useLayoutEffect, useRef, useMemo } from 'react'; |
| |
| /** |
| * Execute a memoized callback only when mounted. Execute again when factory updated. |
| * Returns undefined if not mounted yet. |
| */ |
| export default function useMountedMemo<T>(factory: () => T, deps?: unknown[]): T | undefined { |
| const mounted = useRef<typeof factory>(); |
| useLayoutEffect(() => { |
| mounted.current = factory; |
| }); |
| return useMemo(() => { |
| if (mounted.current) { |
| return factory(); |
| } |
| return undefined; |
| // eslint-disable-next-line react-hooks/exhaustive-deps |
| }, [mounted.current, mounted.current === factory, ...(deps || [])]); |
| } |
