Macro web_application 

macro_rules! web_application {
    ($content:path) => { ... };
    ($builder:expr, $content:path) => { ... };
}

Declares the browser entry point for an application whose root is a composable.

A page has no library loader and no main of its own: the Renderer’s module owns the loop and calls this once both wasm modules exist. The export is defined where the root is because a browser refuses to instantiate a module with an import nobody supplies.

compose_rust::web_application!(app);