From 0fb76926e70de7a2a5328357709d75efd70eae7f Mon Sep 17 00:00:00 2001
From: Andrea Leopardi <an.leopardi@gmail.com>
Date: Thu, 16 Feb 2023 12:43:52 +0100
Subject: Add spec to Logger.default_formatter/1 (#12406)

---
 lib/logger/lib/logger.ex | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/logger/lib/logger.ex b/lib/logger/lib/logger.ex
index 95b7c2914..2b23d31b0 100644
--- a/lib/logger/lib/logger.ex
+++ b/lib/logger/lib/logger.ex
@@ -415,7 +415,8 @@ defmodule Logger do
   instead.
   """
   @doc since: "1.15.0"
-  def default_formatter(overrides \\ []) do
+  @spec default_formatter(keyword) :: {module, :logger.formatter_config()}
+  def default_formatter(overrides \\ []) when is_list(overrides) do
     Application.get_env(:logger, :default_formatter, [])
     |> Keyword.merge(overrides)
     |> Logger.Formatter.new()
-- 
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