From d3c8693c25178e4879954df64d8533becbe046f5 Mon Sep 17 00:00:00 2001
From: Alex Coleman <alex@yellowcanary.com.au>
Date: Sun, 11 Sep 2022 13:44:24 +1000
Subject: [PATCH] Initial commit - add MergeHow

---
 pandas/_typing.py    | 3 +++
 pandas/core/frame.py | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/pandas/_typing.py b/pandas/_typing.py
index dc51c04447bef..208d68bcec572 100644
--- a/pandas/_typing.py
+++ b/pandas/_typing.py
@@ -331,3 +331,6 @@ def closed(self) -> bool:
 
 # dropna
 AnyAll = Literal["any", "all"]
+
+# merge
+MergeHow = Literal["left", "right", "inner", "outer", "cross"]
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 74cb9fae4fd20..95bde2ed76cb4 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -68,6 +68,7 @@
     IndexKeyFunc,
     IndexLabel,
     Level,
+    MergeHow,
     NaPosition,
     PythonFuncType,
     QuantileInterpolation,
@@ -10104,7 +10105,7 @@ def _join_compat(
     def merge(
         self,
         right: DataFrame | Series,
-        how: str = "inner",
+        how: MergeHow = "inner",
         on: IndexLabel | None = None,
         left_on: IndexLabel | None = None,
         right_on: IndexLabel | None = None,