1 files changed, 7 insertions, 0 deletions
diff --git a/coverage/types.py b/coverage/types.py
index 54c1dfba..ed22e699 100644
--- a/coverage/types.py
+++ b/coverage/types.py
@@ -166,3 +166,10 @@ class TDebugCtl(Protocol):
 
     def write(self, msg: str) -> None:
         """Write a line of debug output."""
+
+
+class TWritable(Protocol):
+    """Anything that can be written to."""
+
+    def write(self, msg: str) -> None:
+        """Write a message."""