Add config for prerender by default

Author: nning

README.md

@@ -33,6 +33,7 @@ https://github.com/nning/svelte-rails-demo/commits/master
 
 ```erb
 <%= svelte_component :Hello, name: 'Svelte' %>
+<%= svelte_component :Hello, {name: 'Svelte'}, {prerender: true} %>
 ```
 
 ## Controller Renderer
@@ -55,6 +56,13 @@ end
 * Render pools
 * Better documentation for setup
 
+## Configuration Options
+
+Configuration can be changed in `config/application.rb`, for example.
+
+    # Prerender (SSR) by default (i.e. without passing `prerender:true` to the view helper)
+    config.svelte.prerender_default = false
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/nning/svelte-rails. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/nning/svelte-rails/blob/master/CODE_OF_CONDUCT.md).

lib/svelte/rails/railtie.rb

@@ -2,6 +2,11 @@
 
 module Svelte::Rails
   class Railtie < ::Rails::Railtie
+    config.svelte = ActiveSupport::OrderedOptions.new
+
+    # Prerender (SSR) by default (i.e. without passing `prerender:true` to the view helper)
+    config.svelte.predender_default = false
+
     initializer 'svelte_rails.setup_view_helpers', after: :load_config_initializers, group: :all do |app|
       ActiveSupport.on_load(:action_view) do
         include ::Svelte::Rails::ViewHelper

lib/svelte/renderer.rb

@@ -13,6 +13,11 @@ class Renderer
 
     def render(name, props = {}, options = {}, &block)
       prerender_options = options[:prerender]
+
+      if prerender_options.nil?
+        prerender_options = ::Rails.application.config.svelte.prerender_default
+      end
+
       if prerender_options
         block = Proc.new { concat(prerender_component(name, props, prerender_options)) }
       end