TanStack-Query
queryKey
How queryKey works in TanStack Query and why it evolved from inline arrays to query key factories and queryOptions, with the TkDodo pattern.
Placing ErrorBoundary
How many ErrorBoundary layers to use, how much screen one failure costs, and what else a retry button has to unlock before it actually retries.
Error Propagation
Throw the same error from seven places and only four reach an ErrorBoundary. This post traces where each kind actually propagates.