TanStack/query
May 2025 – Oct 2025
3 Months active
Languages Used
JavaScriptTypeScript
Technical Skills
Asynchronous ProgrammingDebuggingFull Stack DevelopmentJavaScriptReactState Management
Fredrik Höglund
PROFILE
Fredrik Höglund
Worked on the TanStack/query repository to enhance the reliability and maintainability of React Query’s hydration process. Delivered a core feature refactoring HydrationBoundary, simplifying state management by deriving hydration queues as memoized values, which improved performance and reduced complexity. Addressed critical bugs by hardening promise hydration logic, preventing outdated or in-flight promises from causing infinite loops or race conditions, and ensuring robust error handling for rejected pending queries. Focused on asynchronous programming, debugging, and state management using JavaScript, TypeScript, and React. Added targeted tests to strengthen correctness under concurrency, resulting in a more stable and maintainable hydration pipeline.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
4Total
Bugs
2
Commits
4
Features
1
Lines of code
568
Activity Months3
Your Network
147 peopleWork History
October 2025
1 Commits
Oct 1, 2025October 2025: Maintained and stabilized the hydration pipeline in TanStack/query. No new features introduced this month; primary work focused on hardening hydration of pending queries and preventing unhandled promise rejections. The changes reduce crash risk and improve user experience during de/rehydration.
1 Commits
Oct 1, 2025October 2025: Maintained and stabilized the hydration pipeline in TanStack/query. No new features introduced this month; primary work focused on hardening hydration of pending queries and preventing unhandled promise rejections. The changes reduce crash risk and improve user experience during de/rehydration.
October 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Key feature delivery focused on hydration performance and state simplification in TanStack/query. Implemented HydrationBoundary Refactor for React-Query Hydration Performance by removing hydrationQueue from state and deriving it as a memoized value, preserving hydration functionality while simplifying state management. This change lays groundwork for improved hydration efficiency and easier maintainability, aligning with performance and reliability goals.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Key feature delivery focused on hydration performance and state simplification in TanStack/query. Implemented HydrationBoundary Refactor for React-Query Hydration Performance by removing hydrationQueue from state and deriving it as a memoized value, preserving hydration functionality while simplifying state management. This change lays groundwork for improved hydration efficiency and easier maintainability, aligning with performance and reliability goals.
May 2025
2 Commits
May 1, 2025May 2025: TanStack/query delivered a robust promise hydration fix in the core to prevent hydration of outdated or in-flight promises, avoid infinite loops on failed promises, and only hydrate when there is no active fetch for the same query. Added hydration coverage tests to strengthen correctness under concurrency. The change reduces race-condition related failures, improves data freshness guarantees, and enhances overall reliability of the query core.
2 Commits
May 1, 2025May 2025: TanStack/query delivered a robust promise hydration fix in the core to prevent hydration of outdated or in-flight promises, avoid infinite loops on failed promises, and only hydrate when there is no active fetch for the same query. Added hydration coverage tests to strengthen correctness under concurrency. The change reduces race-condition related failures, improves data freshness guarantees, and enhances overall reliability of the query core.
May 2025
Activity
Loading activity data...
Quality Metrics
Correctness90.0%
Maintainability90.0%
Architecture85.0%
Performance85.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaScriptTypeScript
Technical Skills
Asynchronous ProgrammingDebuggingError HandlingFrontend DevelopmentFull Stack DevelopmentJavaScriptReactReact QueryState ManagementTestingTypeScript
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline