Leptos Knowledge Patch

Covers Leptos 0.8.8–0.8.17 (2024-08-26 through 2025-03-01). Claude Opus 4.6 knows Leptos through 0.6.x. It is unaware of the features below.

Index

Topic	Reference	Key features
Components & views	references/components-and-views.md	<ShowLet>, <Show> signal support
Server functions	references/server-functions.md	Bitcode encoding option

---

<ShowLet> Component (0.8.8)

New component for unwrapping Option values — similar to <Show> but provides the inner value to children:

<ShowLet
    when=move || some_option.get()
    fallback=|| view! { <p>"Nothing here"</p> }
    let:value
>
    <p>"Got: " {value}</p>
</ShowLet>

<Show> Accepts Signals Directly (0.8.8)

<Show when=...> now accepts signals in addition to closures:

let visible = RwSignal::new(true);
// Before: <Show when=move || visible.get()>
// Now also: <Show when=visible>

Bitcode Encoding for Server Functions (0.8.11)

New Bitcode encoding option for server function IO, alongside existing Json, Cbor, etc. Requires the bitcode feature on server_fn.

#[server(endpoint = "my_fn", encoding = "Bitcode")]
pub async fn my_server_fn(data: MyData) -> Result<MyResponse, ServerFnError> {
    // ...
}

Reference Files

File	Contents
components-and-views.md	<ShowLet> component, <Show> signal support
server-functions.md	Bitcode encoding for server functions