From 40fc991d0d6c1daad3d1b76e3c4c196b5c527c86 Mon Sep 17 00:00:00 2001
From: Matthew Gieger <mgieger@adobe.com>
Date: Fri, 1 Dec 2023 12:48:08 -0800
Subject: [PATCH] Delete root level alias

---
 lib/style/single_node.ex        |  4 ++++
 test/style/single_node_test.exs | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lib/style/single_node.ex b/lib/style/single_node.ex
index ef3f6daf..0c42cb14 100644
--- a/lib/style/single_node.ex
+++ b/lib/style/single_node.ex
@@ -30,6 +30,10 @@ defmodule Styler.Style.SingleNode do
   alias Styler.Style
   alias Styler.Zipper
 
+  # Delete root level alias
+  # `alias Foo` -> ``
+  def run({{:alias, _, [{:__aliases__, _, [_]}]}, _} = zipper, ctx), do: {:cont, Zipper.remove(zipper), ctx}
+
   def run({node, meta}, ctx), do: {:cont, {style(node), meta}, ctx}
 
   # Our use of the `literal_encoder` option of `Code.string_to_quoted_with_comments!/2` creates
diff --git a/test/style/single_node_test.exs b/test/style/single_node_test.exs
index 40cc9a92..401fd77a 100644
--- a/test/style/single_node_test.exs
+++ b/test/style/single_node_test.exs
@@ -290,4 +290,20 @@ defmodule Styler.Style.SingleNodeTest do
       assert_style("Enum.reverse(foo, bar) ++ bar")
     end
   end
+
+  test "Delete root level alias" do
+    assert_style(
+      """
+      alias unquote(Foo)
+      alias Foo
+      alias Bar, as: Bop
+      alias __MODULE__
+      """,
+      """
+      alias __MODULE__
+      alias Bar, as: Bop
+      alias unquote(Foo)
+      """
+    )
+  end
 end