FRONTEND MEMORY LEAKS: A 500-REPOSITORY STATIC ANALYSIS AND FIVE-SCENARIO BENCHMARK STUDY

Summary from the TLDR Dev newsletter

A researcher scanned 500 popular open-source frontend repos and found that 86% have at least one missing-cleanup pattern. This includes things like useEffect without a cleanup return or .subscribe() without .unsubscribe(). They then ran controlled benchmarks showing each unhandled pattern leaks about 8 KB per mount/unmount cycle, which compounds fast in long-lived sessions like dashboards or Electron apps.