Mixing client and server code is the new paradigm in React with Server Components. With the “use server” directive, you can run components exclusively on the server. This means that you can do things like write asynchronous database queries right in the component code. You might even mix SQL or a different language right in your JSX code.

Some thoughts on the benefits and drawbacks of this architecture.

Why is this good?

 * More performant (if used correctly). The naive way to deliver modern

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Mixing client and server code in React with Server Components allows for more performant web applications, colocated code for quicker iteration, and React Component as the new API. However, it can also cause confusion in determining whether a component is a client or server component, impact dependencies and code organization, complicate the render pipeline, and introduce implicit infrastructure assumptions.

On Mixing Client and Server