Update docs for what options are required

README.md

@@ -97,11 +97,19 @@ Finally, replace your `<.flash_group />` component with the new `<LiveToast.toas
 <.flash_group flash={@flash} />
 
 <!-- And replace it with this: -->
-<LiveToast.toast_group flash={@flash} connected={assigns[:socket] != nil} />
+<LiveToast.toast_group
+  flash={@flash}
+  connected={assigns[:socket] != nil}
+  toasts_sync={assigns[:toasts_sync]}
+/>
 
 <%= @inner_content %>
 ```
 
+Those three options, `flash`, `connected`, and `toasts_sync` are all required. The library will not function properly if
+you do not pass them in.
+
+
 > **Note:**
 > As far as I can tell in my testing, this usage of `assigns` in the layout has no negative impact on change tracking.
 
@@ -172,7 +180,12 @@ end
 You can change which corner the toasts are anchored to by passing the `corner` setting to `toast_group`, one of either `:top_left`, `:top_right`, `:bottom_left`, `:bottom_right`. The default is `:bottom_right`.
 
 ```heex
-<LiveToast.toast_group flash={@flash} connected={assigns[:socket] != nil} corner={:top_right} />
+<LiveToast.toast_group
+  flash={@flash}
+  connected={assigns[:socket] != nil}
+  corner={:top_right}
+  toasts_sync={assigns[:toasts_sync]}
+/>
 ```
 
 ### Internationalization
@@ -253,7 +266,12 @@ end
 And then use it to override the default styles:
 
 ```heex
-<LiveToast.toast_group flash={@flash} connected={assigns[:socket] != nil} toast_class_fn={&MyModule.toast_class_fn/1} />
+<LiveToast.toast_group
+  flash={@flash}
+  connected={assigns[:socket] != nil}
+  toast_class_fn={&MyModule.toast_class_fn/1}
+  toasts_sync={assigns[:toasts_sync]}
+/>
 ```
 
 If you need to change the classes of the container, there is a similar function parameter called [`group_class_fn`](https://hexdocs.pm/live_toast/LiveToast.html#group_class_fn/1). Reference the documentation and apply the override just as you would `toast_class_fn/1` shown above.
@@ -270,6 +288,7 @@ additional severity level, like `:warning`, you can pass a list of these values
   connected={assigns[:socket] != nil}
   kinds={[:info, :error, :warning]}
   toast_class_fn={&custom_toast_class_fn/1}
+  toasts_sync={assigns[:toasts_sync]}
 />
 ```
 

lib/live_toast.ex

@@ -188,7 +188,12 @@ defmodule LiveToast do
 
   Then use it in your layout:
 
-      <LiveToast.toast_group flash={@flash} connected={assigns[:socket] != nil} group_class_fn={MyModule.group_class_fn/1} />
+  <LiveToast.toast_group
+    flash={@flash}
+    connected={assigns[:socket] != nil}
+    toasts_sync={assigns[:toasts_sync]}
+    group_class_fn={MyModule.group_class_fn/1}
+  />
 
   Since this is a public function, you can also write a new function that calls it and extends it's return values.
   """
@@ -206,7 +211,7 @@ defmodule LiveToast do
 
   attr(:flash, :map, required: true, doc: "the map of flash messages")
   attr(:id, :string, default: "toast-group", doc: "the optional id of flash container")
-  attr(:connected, :boolean, default: false, doc: "whether we're in a liveview or not")
+  attr(:connected, :boolean, required: true, doc: "whether we're in a liveview or not")
   attr(:kinds, :list, default: [:info, :error], doc: "the valid severity level kinds")
 
   attr(:corner, :atom,
@@ -225,7 +230,7 @@ defmodule LiveToast do
     doc: "function to override the toast classes"
   )
 
-  attr :toasts_sync, :list, default: nil
+  attr :toasts_sync, :list, required: true, doc: "toasts that get synchronized when calling `put_toast`"
 
   @doc """
   Renders a group of toasts and flashes.