Make it possible to disable SSR

README.md

@@ -103,6 +103,7 @@ Svelte components need to go into the `assets/svelte` directory
 - Set the `name` of the Svelte component.
 - _Optional:_ Provide the `props` you want to use that should be reactive as a map to the props field
 - _Optional:_ Provide `class` to set the class attribute on the root svelte element
+- _Optional:_ Set `ssr` to false to disable server-side rendering
 
 e.g. If your component is named `assets/svelte/Example.svelte`:
 
@@ -222,6 +223,23 @@ e.g. Typescript
 cd assets && npm install --save-dev typescript
 ```
 
+### SSR
+
+SSR is enabled by default, but if you don't want to use Server-Side Rendering for Svelte, you can do 2 things:
+
+#### Globally
+
+If you don't want to use SSR on any component you can disable it globally.
+This will automatically be the case if you don't include the `NodeJs` supervisor in you `application.ex` file
+
+#### Component
+
+To disable SSR on a specific component, set the `ssr` property to false. Like so:
+
+```
+<LiveSvelte.render name="Example" ssr={false} />
+```
+
 ## Caveats
 
 ### Slot Interoperability

lib/component.ex

@@ -8,6 +8,7 @@ defmodule LiveSvelte do
   attr(:props, :map, default: %{})
   attr(:name, :string, required: true)
   attr(:class, :string, default: nil)
+  attr(:ssr, :boolean, default: true)
 
   slot(:inner_block)
 
@@ -23,8 +24,12 @@ defmodule LiveSvelte do
       |> Slots.js_process()
 
     ssr_code =
-      if init do
-        SSR.render(assigns.name, Map.get(assigns, :props, %{}), slots)
+      if init and Map.get(assigns, :ssr) do
+        try do
+          SSR.render(assigns.name, Map.get(assigns, :props, %{}), slots)
+        rescue
+          SSR.NodeNotConfigured -> nil
+        end
       end
 
     assigns =

lib/ssr.ex

@@ -1,7 +1,19 @@
+defmodule LiveSvelte.SSR.NodeNotConfigured do
+  defexception message: """
+                 NodeJS is not configured. Please add the following to your application.ex:
+                 {NodeJS.Supervisor, [path: "#{File.cwd!()}/assets", pool_size: 4]},
+               """
+end
+
 defmodule LiveSvelte.SSR do
   def render(name, props, slots \\ nil)
   def render(name, nil, slots), do: render(name, %{}, slots)
 
-  def render(name, props, slots),
-    do: NodeJS.call!({"js/render", "render"}, [name, props, slots])
+  def render(name, props, slots) do
+    try do
+      NodeJS.call!({"js/render", "render"}, [name, props, slots])
+    catch
+      :exit, {:noproc, _} -> raise LiveSvelte.SSR.NodeNotConfigured
+    end
+  end
 end