React-Query v2: Unlocking Enhanced Performance and New Features

A Brief Overview of the Changes

The latest release of react-query, version 2.5.4, has brought significant changes to the API and impressive performance improvements. One notable change is the introduction of the idle query state, which allows dependent queries to start in a default state, enabling more informative messaging based on the query’s status.

Another significant update is the revamped global configuration object, which is now sectioned into three parts: shared, queries, and mutations. This change makes it easier to manage and configure your react-query setup.

Simplified Query Status Management

Gone are the days of splitting query statuses into separate variables. With react-query v2, you can assign a query to a single variable, making your code more concise and easier to maintain. The new query status Booleans include:

• isLoading
• isError
• isSuccess

const { isLoading, isError, isSuccess } = useQuery(...)

Migrating Your App to React-Query v2

To demonstrate the migration process, we’ll update a previously built app from react-query v1 to v2. We’ll focus on the main component, Recipe component, and Recipes component, as these were the most affected by the new changes.

Updating the Global Configuration Object

In the main component, we’ll reconfigure the global configuration object to follow the new pattern. We’ll also add a new option, refetchOnWindowFocus, which re-fetches the rendered query when the browser window is visited.

import { QueryClient } from 'eact-query';

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      refetchOnWindowFocus: true,
    },
  },
});

Streamlining Query Variables and Handlers

In the Recipe component, we’ll update the query variables to use the new query status Boolean.

const { data, isLoading, isError } = useQuery(...);

if (isLoading) {
  return

;
}

if (isError) {
  return

;
}

return

;

In the Recipes component, we’ll update to use the new invalidateQueries method instead of refetchQueries.

import { useQueryClient } from 'eact-query';

const queryClient = useQueryClient();

queryClient.invalidateQueries('recipes');

Seamless Migration, Improved Performance

With these changes in place, our app has successfully migrated to react-query v2, retaining its original functionality while benefiting from the new features and performance enhancements.

Unlock the Full Potential of React-Query

The updates in react-query v2 are designed to simplify your development workflow and improve the overall user experience. By embracing these changes, you can build faster, more reliable, and more scalable applications.