From 3bfcd686a962460c6fc7ba8154447ecac69ffc3f Mon Sep 17 00:00:00 2001
From: zedzhen <59135268+zedzhen@users.noreply.github.com>
Date: Sun, 21 Jun 2026 21:04:13 +0300
Subject: [PATCH] Correct type of dependency_groups

---
 CHANGELOG.rst                            |  1 +
 src/dependency_groups/_implementation.py | 10 +++++-----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 8c7f3ca..184e0c8 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,7 @@ Unreleased
 
 - Add support for Python 3.14
 - Remove support for Python 3.8
+- Correct type of dependency_groups
 
 1.3.1
 -----
diff --git a/src/dependency_groups/_implementation.py b/src/dependency_groups/_implementation.py
index 4609fbe..80d78b8 100644
--- a/src/dependency_groups/_implementation.py
+++ b/src/dependency_groups/_implementation.py
@@ -12,8 +12,8 @@ def _normalize_name(name: str) -> str:
 
 
 def _normalize_group_names(
-    dependency_groups: Mapping[str, str | Mapping[str, str]],
-) -> tuple[Mapping[str, str | Mapping[str, str]], Mapping[str, str]]:
+    dependency_groups: Mapping[str, list[str | Mapping[str, str]]],
+) -> tuple[Mapping[str, list[str | Mapping[str, str]]], Mapping[str, str]]:
     """
     Normalize group names and return both normalized groups and reverse mapping.
 
@@ -78,7 +78,7 @@ class DependencyGroupResolver:
 
     def __init__(
         self,
-        dependency_groups: Mapping[str, str | Mapping[str, str]],
+        dependency_groups: Mapping[str, list[str | Mapping[str, str]]],
     ) -> None:
         if not isinstance(dependency_groups, Mapping):
             raise TypeError("Dependency Groups table is not a mapping")
@@ -219,7 +219,7 @@ def resolve_all(self) -> Mapping[str, tuple[Requirement, ...]]:
 
 
 def resolve(
-    dependency_groups: Mapping[str, str | Mapping[str, str]], /, *groups: str
+    dependency_groups: Mapping[str, list[str | Mapping[str, str]]], /, *groups: str
 ) -> tuple[str, ...]:
     """
     Resolve a dependency group to a tuple of requirements, as strings.
@@ -238,7 +238,7 @@ def resolve(
 
 
 def resolve_all(
-    dependency_groups: Mapping[str, str | Mapping[str, str]],
+    dependency_groups: Mapping[str, list[str | Mapping[str, str]]],
     /,
     *,
     normalize: bool = False,