Allow server components in islands architecture to call code behind ssr without need for #[server] about leptos HOT 1 OPEN

This is not unreasonable. The way it works how it currently works is this: when compiling the frontend in islands node, the compiler actually compiles the whole application, then does dead code elimination to remove anything that's not used in the body of an island.

This is because #[component] does not mean "guaranteed to run on the server"; an island can use a component in its body and that will be included in the WASM binary. We don't have server components guaranteed only to be on the server; we have islands guaranteed to be on the client, and shared components.

A straightforward workaround is to cfg-flag whatever server-only code you want to call in a component, and #[cfg(not(feature= "ssr"))] let foo = unreachable!(); if you are sure you don't use it in an island.

from leptos.