Guard Mix.Project at runtime

lib/phoenix_live_reload/channel.ex

@@ -19,17 +19,14 @@ defmodule Phoenix.LiveReloader.Channel do
         WebConsoleLogger.subscribe(@logs)
       end
 
-      deps_paths =
-        for {app, path} <- Mix.Project.deps_paths(), into: %{}, do: {to_string(app), path}
-
       config = socket.endpoint.config(:live_reload)
 
       socket =
         socket
         |> assign(:patterns, config[:patterns] || [])
         |> assign(:debounce, config[:debounce] || 0)
         |> assign(:notify_patterns, config[:notify] || [])
-        |> assign(:deps_paths, deps_paths)
+        |> assign(:deps_paths, deps_paths())
 
       {:ok, join_info(), socket}
     else
@@ -133,4 +130,12 @@ defmodule Phoenix.LiveReloader.Channel do
       %{}
     end
   end
+
+  defp deps_paths do
+    if Code.loaded?(Mix.Project) do
+      for {app, path} <- Mix.Project.deps_paths(), into: %{}, do: {to_string(app), path}
+    else
+      %{}
+    end
+  end
 end