From f8be4f8fc747772d9639fdbb6e84ddbcfb61593a Mon Sep 17 00:00:00 2001
From: Dylan Baker <dylan@pnwbakers.com>
Date: Thu, 24 Sep 2020 09:33:21 -0700
Subject: adding a _typing module

this is a place that *must* only be imported inside a if
typing.TYPE_CHECKING block. It is a mixture of smoothing over thinigs
that moved from typing_extensions to typing in later python versions and
useful but typing only code.

This makes typing_extensions required for python versions older than
3.8 *when running mypy*. typing_extensions should *only* be imported
inside an `if typing.TYPE_CHECKING` block (include the new _typing.py
module) to ensure that it doesn't become a runtime dependency
---
 setup.cfg | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'setup.cfg')

diff --git a/setup.cfg b/setup.cfg
index 2ce0c4a40..7c49b71c6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -43,6 +43,9 @@ console_scripts =
 [options.extras_require]
 progress =
   tqdm
+typing =
+  mypy
+  typing_extensions; python_version <"3.8"
 
 [options.packages.find]
 include = mesonbuild, mesonbuild.*
-- 
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