Optimizing Performance with React Query v5: Best Practices and Tips

React Query is a powerful library that helps you manage state, synchronization, caching, and error handling in your React applications. It is a pre-configured data management library that gives you power and control over server-side state management, fetching and caching of data, and error handling in a simple and declarative way without affecting the global state of your application.

React Query v5 is the latest version of this library, which has been released recently. In this blog, we will discuss the new features and improvements in React Query v5, how to install it, and how to migrate from the previous version.

We will also compare React Query v5 with other state management libraries and discuss its use cases, best practices, tips and tricks, common issues and solutions, debugging techniques, performance optimization, caching strategies, data fetching strategies, infinite queries, breaking changes, custom context, custom logger, global callbacks, edge cases, garbage collection, structural sharing, error handling, and loading state.

What's new in React Query v5?

React Query v5 comes with several new features and improvements, including:

• Improved Infinite Queries: Infinite Queries can now prefetch multiple pages at once, and you have the option to specify the maximum amount of pages stored in the cache.
• Customizable Loading State: You can now customize the loading state of your queries with a loading spinner or any other UI element.
• Garbage Collection: React Query v5 has a garbage collection mechanism that automatically removes inactive queries from the cache to free up memory.
• Structural Sharing: React Query v5 uses structural sharing to optimize the cache and reduce memory usage.
• Custom Logger: You can now create a custom logger to log output from your queries.
• New QueryClient: React Query v5 has a new QueryClient that supports private fields and a new API for loading state.
• Breaking Changes: React Query v5 has several breaking changes, including removing some overloads and the isDataEqual option from useQuery.

React Query v5 features overview

React Query v5 has several features that make it a powerful and flexible library for state management and data fetching in your React applications. Some of the key features of React Query v5 include:

• Caching: React Query v5 provides a powerful caching mechanism that allows you to cache data in memory, local storage, or any other storage medium of your choice.
• Error Handling: React Query v5 provides a simple and declarative way to handle errors during data fetching.
• Optimistic Updates: React Query v5 allows you to perform optimistic updates to your data, which means that you can update your UI immediately and then update the data in the background.
• Infinite Queries: React Query v5 provides a powerful mechanism for fetching infinite data, such as paginated data or data from a live stream.
• Custom Context: React Query v5 allows you to pass a custom context to all react-query hooks, which allows for proper isolation when using multiple instances of React Query in the same application.
• Global Callbacks: React Query v5 provides global callbacks that allow you to perform actions when a query is successfully fetched, when it fails, or when it is invalidated.
• Loading State: React Query v5 provides a customizable loading state that allows you to show a loading spinner or any other UI element while your data is being fetched.

React Query v5 installation guide

To install React Query v5, you can use npm or yarn. Here is the command to install React Query v5 using npm:

1npm install @tanstack/react-query@5.0.0
2

Here is the command to install React Query v5 using yarn:

1yarn add @tanstack/react-query@5.0.0
2

Migrating to React Query v5

If you use React Query v4 or an earlier version, you must migrate to React Query v5 to take advantage of its new features and improvements. The migration process involves updating your code to use the new API and handling any breaking changes that may affect your application. You can find a detailed guide on how to migrate to React Query v5 in the official documentation.

Using React Query with Next.js

React Query can be used with Next.js to fetch data on the server and client side. You can use the useQuery and useMutation hooks to fetch and mutate data in your Next.js application. You can also use the prefetchQuery function to prefetch data on the server and client side. You can find a detailed guide on how to use React Query with Next.js in the official documentation.

Using React Query with React Native

React Query can also be used with React Native to fetch data in your mobile application. You can use the useQuery and useMutation hooks to fetch and mutate data in your React Native application. You can also use the prefetchQuery function to prefetch data on the client side. You can find a detailed guide on using React Query with React Native in the official documentation.

React Query v5 compatibility with React 16

React Query v5 requires React 18.0 or later. This is because it uses the new useSyncExternalStore hook, which is only available in React 18.0 and later. If you are using an earlier version of React, you must upgrade to React 18.0 or later to use React Query v5.

React Query vs Redux: Which one to use?

React Query and Redux are popular libraries for state management in React applications. While Redux is a more general-purpose library that can be used for any state management, React Query is specifically designed for data fetching and caching. If you are building an application that requires complex state management, you may want to use Redux. However, if you are building an application that requires data fetching and caching, React Query may be a better choice.

How to add a React Query in React?

To add a React Query in React, you can use the useQuery hook. Here is an example of how to use the useQuery hook to fetch data:

1import { useQuery } from '@tanstack/react-query';
2
3function App() {
4  const { data, isLoading, error } = useQuery('todos', fetchTodos);
5
6  if (isLoading) {
7    return <div>Loading...</div>;
8  }
9
10  if (error) {
11    return <div>Error: {error.message}</div>;
12  }
13
14  return (
15    <ul>
16      {data.map((todo) => (
17        <li key={todo.id}>{todo.title}</li>
18      ))}
19    </ul>
20  );
21}
22

In this example, we use the useQuery hook to fetch a list of todos from the server. The useQuery hook takes two arguments: the query key and the query function. The query key is a unique identifier for the query, and the query function is a function that returns the data to be fetched.

TanStack Query: An overview

TanStack Query is an open-source project by Tanner Linsey that provides a pre-configured data management library for React applications. It is designed to simplify state management, data fetching, and caching in your React applications.

Is TanStack Query a React Query?

TanStack Query is a fork of React Query v3, which Tanner Linsley created. It is a pre-configured data management library that provides a simple and declarative way to manage state, synchronization, caching, and error handling in your React applications. TanStack Query is designed to make the React Query async state manager available to frameworks beyond React, and it comes with a variety of new features. TanStack Query is available for React, Svelte, Solid, and Vue.

React Query v4 is now known as @tanstack/react-query, and it is the latest version of React Query. TanStack Query is a fork of React Query v3, and it has evolved into a separate library with its own set of features and improvements. While TanStack Query and React Query share many similarities, they are not the same library.

If you are looking for a powerful and flexible library for state management and data fetching in your React applications, TanStack Query and React Query are excellent choices. However, you should choose the library that best fits your needs and requirements.

React Query v5 vs React Query v4

React Query v5 is the latest version of the library and comes with several new features and breaking changes compared to React Query v4. Here are some of the main differences between the two versions:

• React Query v5 requires React 18.0 or later, while React Query v4 is compatible with earlier versions of React.
• React Query v5 has removed most overloads from the codebase, unifying how you use the library.
• The isDataEqual option has been removed from useQuery in React Query v5. Previously, this function indicated whether to use previous data (true) or new data (false) as resolved data for the query. You can achieve the same functionality by passing a function to structuralSharing instead.
• The contextSharing prop has been removed from QueryClientProvider in React Query v5. You could previously use the Hydrate component as a wrapper over useHydrate hook, which has been removed.
• React Query v5 has new features, such as a simplified way to perform optimistic updates by leveraging the returned variables from useMutation.

To migrate from React Query v4 to v5, you must un-/install dependencies and change the imports. React Query v5 also has a codemod to help with the migration.

React Query v5 Use Cases

React Query v5 is a versatile library used in various use cases. Here are some of the main use cases for React Query v5:

1. Data fetching: React Query v5 is primarily designed for fetching data from APIs and managing server state in React applications. It provides a simple and intuitive API for fetching and caching data in memory.
2. Real-time updates: React Query v5 can handle real-time updates from APIs using web sockets or other real-time protocols. It provides a simple way to subscribe to updates and keep the UI in sync with the server.
3. Infinite scrolling: React Query v5 provides built-in support for infinite scrolling, making it easy to fetch and display large amounts of data performantly.
4. Form validation: React Query v5 can be used for form validation by fetching data from the server and validating it on the client side. This can help improve the user experience by providing instant feedback on form errors.
5. Offline support: React Query v5 can provide offline support for React applications by caching data in memory and syncing it with the server when the network is available.
6. Global state management: React Query v5 can be a solution for React applications. It provides a simple and intuitive API for managing server state and sharing it across components.
7. Testing: React Query v5 can simplify the testing of React applications by providing a simple and intuitive API for mocking server responses and testing different scenarios.

By leveraging the features of React Query v5, developers can build performant and scalable React applications that are easy to maintain and test.

React Query v5 vs other state management libraries

React Query v5 is a powerful library for managing server state in React applications, but it is not the only option available. Here are some of the main differences between React Query v5 and other popular state management libraries:

• Redux: Redux is a popular state management library for React applications that uses a centralized store to manage application state. While Redux is more powerful and flexible than React Query v5, it can also be more complex and difficult to set up[1].
• MobX: MobX is another popular state management library for React applications that uses observable data structures to manage application state. While MobX is more lightweight and flexible than Redux, it can also be more difficult to debug and optimize[2].
• Apollo Client: Apollo Client is a GraphQL client for React applications that provides a powerful way to manage server state. While Apollo Client is more powerful and flexible than React Query v5 for managing GraphQL data, it can also be more complex and difficult to set up[3].

React Query v5 is a good choice for applications that need a simple and efficient way to manage server state without the overhead of a more complex state management library. However, if your application requires more advanced features or flexibility, you may consider using a different library, such as Redux or Apollo Client.

React Query v5 Tips and Tricks

React Query is a powerful library that simplifies data fetching and state management in React applications. Here are some tips and tricks to help you get the most out of React Query v5:

1. Use the useQuery hook to fetch data from your API. This hook returns an object that contains the status of the query (loading, error, or success), the data returned from the query, and functions to refetch the data.
2. Use the useMutation hook to perform mutations on your data. This hook returns an object that contains the status of the mutation (loading, error, or success), the data returned from the mutation, and functions to perform the mutation.
3. Use the useInfiniteQuery hook to fetch data in an infinite scroll. This hook returns an object that contains the status of the query (loading, error, or success), the data returned from the query, and functions to fetch more data.
4. Use the useQueryClient hook to access the query client instance. This hook returns the query client instance, which you can use to invalidate queries, clear the cache, and more.
5. Use the queryCache object to access the query cache. This object contains all the cached queries, which you can inspect, invalidate, or clear.
6. Use the staleTime option to control how long a query result is considered fresh. This option allows you to balance between data freshness and performance.
7. Use the cacheTime option to control how long a query result is cached. This option allows you to balance between data freshness and cache size.
8. Use the retry option to control how often a query should be retried in case of a network error. This option allows you to handle network errors gracefully.
9. Use the refetchOnWindowFocus option to control whether a query should be refetched when the window regains focus. This option lets you keep your data up-to-date even when users switch tabs.
10. Use the refetchInterval option to control how often a query should be refetched. This option lets you keep your data up-to-date even when the user is not interacting with your app.

Following these tips and tricks, you can make the most of React Query v5 and build performant and scalable React applications.

React Query v5 common issues and solutions

React Query v5 is a powerful library for managing state in React applications. However, like any library, it can have its issues and challenges. In this section, we will discuss some common issues developers face while using React Query v5 and their solutions.

Issue 1: Caching not working as expected

One of the most common issues with React Query v5 is caching not working as expected. This can happen when the cache is not properly configured or when the data is not being updated in the cache. To solve this issue, you can try the following solutions:

• Check if the cache is properly configured and the cache time is set correctly.
• Make sure that the data is being updated in the cache after fetching new data.
• Use the refetch function to manually refetch the data and update the cache.

Issue 2: Error handling

Another common issue with React Query v5 is error handling. When an error occurs, it can be difficult to handle it properly and display the error message to the user. To solve this issue, you can try the following solutions:

• Use the onError function to handle errors and display the error message to the user.
• Use the useQueryErrorResetBoundary hook to reset the error state when the user navigates away from the page.

Issue 3: Performance optimization

React Query v5 can be a performance bottleneck if not used properly. This can happen when too many queries are being made or when the data is not being properly cached. To solve this issue, you can try the following solutions:

• Use the useInfiniteQuery hook to fetch data in chunks and reduce the number of queries made.
• Use the useQueryClient hook to manually invalidate the cache and reduce the number of queries made.
• Use the useQueries hook to fetch multiple queries in parallel and improve performance.

React Query v5 debugging techniques

Debugging React Query v5 can be a challenging task, especially when dealing with complex applications. In this section, we will discuss some debugging techniques that can help you identify and solve issues with React Query v5.

Technique 1: Use the DevTools

React Query v5 comes with a set of DevTools that can help you debug your application. You can use the DevTools to inspect the cache, view the query status, and monitor the network requests. To use the DevTools, you must install the React Query DevTools extension for your browser.

Technique 2: Use the queryCache

The queryCache is a global cache that stores all the data fetched by React Query v5. You can use the queryCache to inspect the cache, invalidate the cache, and manually refetch the data. To use the queryCache, you need to import it from the react-query package.

Technique 3: Use the useIsFetching hook

The useIsFetching hook can help you monitor the number of queries currently being fetched. You can use this hook to display a loading spinner or a progress bar to the user. To use the useIsFetching hook, you need to import it from the react-query package.

React Query v5 performance optimization

React Query v5 provides several ways to optimize performance. Here are some tips to optimize the performance of your React Query v5 application:

1. Use query caching: React Query v5 provides a built-in caching mechanism that can help reduce the number of network requests your application makes. By default, React Query caches the results of all queries for 5 minutes. You can customize the caching behaviour by passing options to the useQuery hook.
2. Use query prefetching: React Query v5 allows you to prefetch data for a query before it is needed. This can help reduce the perceived latency of your application by fetching data in the background.
3. Use query pagination: If you are dealing with large datasets, you can use query pagination to fetch data in smaller chunks. This can help reduce the amount of data that needs to be fetched at once, which can improve performance.
4. Use query invalidation: React Query v5 allows you to invalidate the cache for a query when the underlying data changes. This can help ensure that your application always displays the most up-to-date data.
5. Use query polling: If you need to fetch data at regular intervals, you can use query polling to automatically refetch data at a specified interval. This can help ensure that your application always displays the most up-to-date data.
6. Use query retries: If a query fails due to a network error, React Query v5 allows you to retry the query a specified number of times automatically. This can help ensure that your application can recover from network errors.
7. Use query deduplication: React Query v5 automatically deduplicates identical queries, which can help reduce the number of network requests your application makes.

React Query v5 caching strategies

React Query v5 provides several caching strategies that you can use to customize the caching behaviour of your application. Here are some of the caching strategies provided by React Query v5:

1. cacheTime: This option allows you to specify how long the results of a query should be cached. By default, React Query caches the results of all queries for 5 minutes.
2. staleTime: This option allows you to specify how long the results of a query can be considered fresh. After this time has elapsed, React Query will automatically refetch the data.
3. refetchInterval: This option allows you to specify how often the data for a query should be refetched. This can be useful if you need to display real-time data in your application.
4. refetchOnWindowFocus: This option allows you to specify whether the data for a query should be refetched when the window regains focus. This can be useful to ensure that your application always displays the most up-to-date data.
5. refetchOnMount: This option allows you to specify whether the data for a query should be refetched when the component mounts. This can be useful to ensure that your application always displays the most up-to-date data.
6. refetchOnReconnect: This option allows you to specify whether the data for a query should be refetched when the network connection is reestablished. This can be useful to ensure that your application always displays the most up-to-date data.
7. manual: This option allows you to disable automatic refetching of data for a query. This can be useful if you need to control when data is fetched in your application.

React Query v5 data fetching strategies

React Query v5 provides several data fetching strategies that you can use to optimize your data fetching. Here are some of the data fetching strategies that you can use with React Query v5:

• Infinite Queries: This data fetching strategy allows you to fetch a large amount of data in small chunks. This can help improve the perceived performance of your application by reducing the time it takes to load new data. You can use the useInfiniteQuery hook to implement infinite queries in your application.
• Parallel Queries: This data fetching strategy allows you to fetch multiple data sets in parallel. This can help improve the performance of your application by reducing the time it takes to load multiple sets of data. You can use the useQueries hook to implement parallel queries in your application.
• Sequential Queries: This data fetching strategy allows you to fetch multiple data sets in sequence. This can be useful if you must fetch data in a specific order. You can use the useQuery hook to implement sequential queries in your application.
• Prefetching: This data fetching strategy allows you to fetch data in advance when needed. This can help improve the perceived performance of your application by reducing the time it takes to load new data. You can use the prefetchQuery function to prefetch data in your application.

You can use these data fetching strategies with React Query v5 by using the appropriate hooks and functions provided by the library.

React Query v5 Infinite Queries

React Query v5 introduces a new feature called "Infinite Queries" that allows you to fetch paginated data in an infinite loop. This feature is useful when you have a large dataset that needs to be fetched in chunks. With infinite queries, you can fetch the first chunk of data and then fetch the next chunk when the user scrolls down to the end of the first chunk.

To use infinite queries, you must create a new query using the useInfiniteQuery hook. This hook takes a queryFn function that returns a promise that resolves to the next chunk of data. The queryFn function receives an object that contains the current page number and the previous page's data.

1const fetchPosts = async ({ pageParam = 0 }) => {
2  const response = await fetch(`/api/posts?page=${pageParam}`);
3  const data = await response.json();
4  return data;
5};
6
7const { data, fetchNextPage, hasNextPage, isFetchingNextPage } = useInfiniteQuery(
8  'posts',
9  fetchPosts,
10  {
11    getNextPageParam: (lastPage, allPages) => lastPage.nextPage,
12  }
13);
14

In the example above, the fetchPosts function fetches the next page of posts and returns it. The useInfiniteQuery hook takes the fetchPosts function and returns an object that contains the current page's data, a function to fetch the next page, a boolean that indicates whether there is a next page and a boolean that indicates whether the next page is currently being fetched.

To fetch the next page, you can call the fetchNextPage function. This function will call the fetchPosts function with the current page number and add the new data to the existing data. If there is no next page, the fetchNextPage function will do nothing.

1<button onClick={() => fetchNextPage()} disabled={!hasNextPage || isFetchingNextPage}>
2  {isFetchingNextPage ? 'Loading more...' : hasNextPage ? 'Load More' : 'Nothing more to load'}
3</button>
4

In the example above, the fetchNextPage function is called when the user clicks the "Load More" button. The button is disabled when there is no next page, or the next page is being fetched.

React Query v5 Custom Context

React Query v5 allows you to create a custom context that can be used to share data between queries. This feature is useful when data needs to be shared across multiple queries, such as authentication tokens or user preferences.

To create a custom context, you need to create a new QueryClient instance and pass it a Provider component that wraps your app.

1import { QueryClient, QueryClientProvider } from 'react-query';
2
3const queryClient = new QueryClient({
4  defaultOptions: {
5    queries: {
6      useErrorBoundary: true,
7      retry: 3,
8      retryDelay: 1000,
9      staleTime: 60000,
10      cacheTime: 600000,
11    },
12  },
13});
14
15function App() {
16  return (
17    <QueryClientProvider client={queryClient}>
18      <MyContext.Provider value={{ token: 'abc123' }}>
19        <MyApp />
20      </MyContext.Provider>
21    </QueryClientProvider>
22  );
23}
24

In the example above, a new QueryClient instance is created with default query options. The QueryClientProvider component is used to make the queryClient available to all child components that use the useQuery or useMutation hooks. The MyContext.Provider component is used to provide a custom context that contains an authentication token.

To use the custom context in a query, you must pass a context object to the useQuery or useMutation hook.

1const { data } = useQuery('todos', fetchTodos, {
2  context: { token: 'abc123' },
3});
4

In the example above, the context object is used to pass an authentication token to the fetchTodos function. The fetchTodos function can then use the token to authenticate the request.

React Query v5 Breaking Changes

React Query v5 comes with some breaking changes you must be aware of. Here are some of the most important ones:

• The queryKey property is now required for all queries. If you don't provide it, you will get an error.
• The queryFn property is now called queryFnArgs. This means you must pass an array of arguments to the queryFn instead of a single argument.
• The queryFn now returns an object with a data property instead of just the data itself. This is to allow for more flexibility in the future.
• The useQuery hook returns an object with a data property instead of just the data itself. This is to allow for more flexibility in the future.
• The useInfiniteQuery hook now requires a fetchNextPage function to be passed as a property. This function is called when the user scrolls to the end of the page and triggers a new query to fetch more data.

Const Query

One of the new features in React Query v5 is the const query function. This function allows you to create a query only executed once and then cached for the application's lifetime. This is useful for data that doesn't change frequently and doesn't need to be refetched on every render.

To create a const query, you need to pass the const option to the useQuery hook:

1const { data } = useQuery('myQuery', fetchMyData, { const: true });
2

Same Instance

Another new feature in React Query v5 is the ability to share the same instance of the QueryClient across multiple components. This can be useful if you have multiple components that need to share the same data.

To share the same instance of the QueryClient, you need to create the instance in a parent component and pass it down to the child components using the QueryClientProvider:

1const queryClient = new QueryClient();
2
3function App() {
4  return (
5    <QueryClientProvider client={queryClient}>
6      <Component1 />
7      <Component2 />
8    </QueryClientProvider>
9  );
10}
11

Default Value

React Query v5 also introduces a new defaultValue option for queries. This option allows you to specify a default value for a query that is used until the actual data is fetched.

To use the defaultValue option, you simply need to pass it as a property to the useQuery hook:

1const { data } = useQuery('myQuery', fetchMyData, { defaultValue: [] });
2

Inactive Queries

React Query v5 introduces a new concept of inactive queries. Inactive queries are queries that are not currently being used by any component. These queries are automatically garbage collected after a certain time to free up memory.

To mark a query as inactive, you need to remove it from the QueryClient:

1queryClient.removeQueries('myQuery');
2

React Query v5 garbage collection

React Query v5 has introduced a new garbage collection feature that helps to manage the memory usage of the cache. This feature is especially useful when dealing with large amounts of data or when the cache is used for a long time. Garbage collection is the process of freeing up memory that is no longer needed by the application. In React Query v5, garbage collection is done automatically by default, but you can manually trigger it if needed.

To enable automatic garbage collection, you can set the gcInterval option when creating a new QueryClient instance. This option specifies the interval (in milliseconds) at which garbage collection should be performed. By default, the gcInterval is set to 60 * 1000 (1 minute). You can also set the gcLimit option to specify the maximum number of queries stored in the cache before garbage collection is triggered. By default, the gcLimit is set to Infinity.

1import { QueryClient } from 'react-query';
2
3const queryClient = new QueryClient({
4  defaultOptions: {
5    queries: {
6      gcInterval: 5 * 60 * 1000, // 5 minutes
7      gcLimit: 50, // maximum of 50 queries
8    },
9  },
10});
11

When garbage collection is triggered, React Query v5 will remove inactive queries from the cache. An inactive query is a query that has not been used for a certain amount of time. By default, the inactive time is set to 5 60 1000 (5 minutes), but you can also set it to a different value using the staleTime option when creating a new query.

1import { useQuery } from 'react-query';
2
3function MyComponent() {
4  const { data } = useQuery('myQuery', fetchMyData, {
5    staleTime: 10 * 60 * 1000, // 10 minutes
6  });
7
8  // ...
9}
10

By setting the staleTime option to a higher value, you can keep the query data in the cache for a longer time, which can improve the performance of your application. However, you should also be careful not to set the staleTime to a value that is too high, as this can cause the cache to use too much memory.

Overall, the garbage collection feature in React Query v5 helps to improve the performance and memory usage of your application by automatically removing inactive queries from the cache. By setting the gcInterval, gcLimit, and staleTime options, you can customize the behaviour of the garbage collection feature to suit your specific needs.

React Query v5 error handling

React Query v5 provides robust error-handling mechanisms to help developers handle errors gracefully. When a query fails, React Query v5 provides a status property that can be used to determine the query's status. The status property can have one of the following values:

• loading: The query is currently loading.
• error: The query has failed with an error.
• success: The query has successfully loaded data.

In addition to the status property, React Query v5 also provides an error property that contains the error object if the query has failed. Developers can use this property to display error messages to users or to handle errors in other ways.

React Query v5 also provides a retry function that can be used to retry a failed query. The retry function takes an optional options object that can be used to customize the retry behavior. For example, developers can use the retryDelay option to specify a delay between retries.

React Query v5 loading state

React Query v5 provides a isLoading property that can be used to determine if a query is currently loading. This property can display loading spinners or other indicators to users while the query is loading.

In addition to the isLoading property, React Query v5 also provides a isFetching property that can be used to determine if a query is currently fetching data. This property can display real-time updates to users while the query fetches data.

Conclusion and next steps

In this blog post, we have explored the new features and improvements in React Query v5. We have discussed how to use React Query with Next.js and React Native, and compared React Query v5 with other state management libraries. We have also discussed best practices, tips and tricks, common issues and solutions, debugging techniques, performance optimization, caching strategies, data fetching strategies, infinite queries, breaking changes, custom context, custom logger, global callbacks, edge cases, garbage collection, structural sharing, error handling, and loading state.

React Query v5 is a powerful and flexible library that can help developers build fast and responsive applications. By following the best practices and tips discussed in this blog post, developers can take full advantage of the features and capabilities of React Query v5.

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