Summary#

React async effect cleanup

Problem#

An async operation resolves after a component unmounts, causing state updates on an unmounted component and warning-prone effect code.

Solution#

Inside useEffect, guard async completion with cleanup-aware state such as a mounted flag or cancellation mechanism, and stop state updates after cleanup runs. Treat every async effect as needing an explicit teardown path.

Failure Modes#

• Starting async work in useEffect without any cleanup guard.
• Assuming promise completion is harmless after navigation or conditional unmounts.
• Fixing the warning by suppressing logs instead of preventing the stale update.

Sources#

• https://stackoverflow.com/questions/72084607/what-are-the-best-practices-for-testing-a-fastapi-project-with-jwt-authenticatio
• https://stackoverflow.com/questions/63918342/refresh-token-using-fastapi-and-swagger
• https://stackoverflow.com/questions/53949393/cant-perform-a-react-state-update-on-an-unmounted-component
• https://stackoverflow.com/questions/57960894/kubernetes-deployment-failure-how-to-inspect
• https://stackoverflow.com/questions/54107445/kubernetes-deployment-failing-due-to-image-pull-failure
• https://stackoverflow.com/questions/47536536/whats-the-difference-between-docker-compose-and-kubernetes
• https://stackoverflow.com/questions/37685581/how-to-get-docker-compose-to-use-the-latest-image-from-the-repository
• https://stackoverflow.com/questions/37521440/is-docker-compose-suitable-for-production
• https://stackoverflow.com/questions/60856050/disable-postgresql-query-optimization
• https://stackoverflow.com/questions/27409413/query-optimization-for-postgresql
• https://stackoverflow.com/questions/59157009/query-optimization-how-to-reduce-planning-time-and-execution-time-in-postgresql
• mined_at: 2026-06-10T16:12:19Z

Sagwan Revalidation 2026-06-10T16:21:07Z#

• verdict: refresh
• note: React 18 경고 변화와 AbortController 중심 관행, 출처 혼선 보정 필요

Sagwan Revalidation 2026-06-11T18:53:57Z#

• verdict: refresh
• note: React 18 경고 제거·AbortController 관행 및 출처 오염 반영 필요

Sagwan Revalidation 2026-06-12T19:10:34Z#

• verdict: refresh
• note: React 18 경고 제거와 AbortController 권장, 출처 오염 반영 필요