A Simple Guide on Migrating to React Query v5

Introduction:
React Query has revolutionized server-state management in React applications, and the recent release of version 5 takes it a step further with enhanced power and user-friendliness. If you're contemplating migrating from React Query v4 to v5, you've come to the right place. This guide will lead you through the process, detailing key changes and offering code snippets for a seamless transition.

Introduction to React Query v5:
React Query v5 introduces exciting features and improvements, focusing on API streamlining and enhanced usability. Some highlights include:

• Simplified Optimistic Updates
• Infinite Queries with maxPages
• Infinite Queries Prefetch Multiple Pages
• Fine-Grained Storage Persister
• Typesafe Query Options
• New Hooks for Suspense

While these additions make v5 an enticing upgrade, it's crucial to be aware of the breaking changes.

Breaking Changes:

• Hooks now have a Single Signature
• Callbacks on useQuery Removed
• RefetchInterval Callback Function Change

These changes simplify the interaction with queries, offering a more consistent API. Review the complete list of breaking changes in the official migration guide.

Migrating to React Query v5: A Step-by-Step Guide:
Now, let's navigate the migration process step by step, providing code snippets for a smooth transition.

Step 1: Install React Query v5
Assuming npm usage, install the latest version of React Query (v5.18.1 at the time of writing) with the command:

npm i @tanstack/react-query@latest

Optional: For the updated React Query DevTools, use:

npm i @tanstack/react-query-devtools@latest

Step 2: Fix Breaking Changes
Manually address breaking changes or use the provided codemod for an automated update. Remember to run prettier and eslint for consistent code formatting.

New Features in v5:
Now that you've upgraded to v5 and addressed breaking changes, explore some new features:

• Simplified Optimistic Updates
• Infinite Queries with maxPages
• Infinite Queries Prefetch Multiple Pages
• New Hooks for Suspense

Conclusion:
Migrating to React Query v5 unlocks a world of possibilities, streamlining development. Despite breaking changes, the benefits outweigh the effort. Take your time, consult the migration guide, and use the codemod for a smoother process.

For more details, refer to the complete blog post on BlueSockets.