Episode Details

When you upload a photo and the badge on screen refuses to update, the instinct is to reach for WebSockets. But that's the wrong layer entirely. This episode breaks down the actual chain of machinery that lets a number change by itself — from the network response landing in the browser, through the state store, the framework's dependency graph, and the render commit. We explore why the break is almost always in the middle links, how TanStack Query reframes server state as a cache, and why the "optimistic update" fix creates a whole new class of bugs.