From bed0965c6e45be19dc910996132b902c19834d67 Mon Sep 17 00:00:00 2001
From: Dan Redding <125183946+dangotbanned@users.noreply.github.com>
Date: Sat, 13 Jul 2024 18:17:49 +0100
Subject: [PATCH] refactor: remove dead `_get_channels_mapping` code (#3467)

---
 altair/vegalite/v5/api.py | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/altair/vegalite/v5/api.py b/altair/vegalite/v5/api.py
index 843315fa7..23138613f 100644
--- a/altair/vegalite/v5/api.py
+++ b/altair/vegalite/v5/api.py
@@ -232,15 +232,6 @@ def to_dict(self, *args, **kwargs) -> dict:
 TOPLEVEL_ONLY_KEYS = {"background", "config", "autosize", "padding", "$schema"}
 
 
-def _get_channels_mapping() -> dict[type[SchemaBase], str]:
-    mapping: dict[type[SchemaBase], str] = {}
-    for attr in dir(channels):
-        cls = getattr(channels, attr)
-        if isinstance(cls, type) and issubclass(cls, core.SchemaBase):
-            mapping[cls] = attr.replace("Value", "").lower()
-    return mapping
-
-
 # -------------------------------------------------------------------------
 # Tools for working with parameters
 class Parameter(_expr_core.OperatorMixin):