🔧 Remove mypy configuration (#825)

## Description

This PR removes the `mypy` configuration from `pyproject.toml`, as we
will be using `ty` for static type checking moving forward.

## Checklist:

- [x] The pull request only contains commits that are focused and
relevant to this change.
- [x] ~I have added appropriate tests that cover the new/changed
functionality.~
- [x] ~I have updated the documentation to reflect these changes.~
- [ ] I have added entries to the changelog for any noteworthy
additions, changes, fixes, or removals.
- [x] ~I have added migration instructions to the upgrade guide (if
needed).~
- [x] The changes follow the project's style guidelines and introduce no
new warnings.
- [x] The changes are fully tested and pass the CI checks.
- [x] I have reviewed my own code changes.

Author: denialhaag

.github/workflows/ci.yml

@@ -200,6 +200,7 @@ jobs:
     uses: munich-quantum-toolkit/workflows/.github/workflows/reusable-python-linter.yml@d6314c45667c131055a0389afc110e8dedc6da3f # v1.17.11
     with:
       enable-ty: true
+      enable-mypy: false
 
   build-sdist:
     name: 🚀 CD

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ ci:
   autoupdate_commit_msg: "⬆️🪝 update pre-commit hooks"
   autoupdate_schedule: quarterly
   autofix_commit_msg: "🎨 pre-commit fixes"
-  skip: [mypy, ty-check]
+  skip: [ty-check]
 
 repos:
   # Standard hooks
@@ -107,20 +107,6 @@ repos:
       - id: prettier
         types_or: [yaml, markdown, html, css, scss, javascript, json]
 
-  # Check static types with mypy
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.1
-    hooks:
-      - id: mypy
-        files: ^(python/|test/python|noxfile.py)
-        args: []
-        additional_dependencies:
-          - importlib_resources
-          - nox
-          - numpy
-          - pytest
-          - mqt.core>=3
-
   # Check static types with ty
   - repo: local
     hooks:

CHANGELOG.md

@@ -9,6 +9,10 @@ This project adheres to [Semantic Versioning], with the exception that minor rel
 
 ## [Unreleased]
 
+### Changed
+
+- 🔧 Replace `mypy` with `ty` ([#775], [#825]) ([**@denialhaag**])
+
 ## [3.4.0] - 2026-01-13
 
 _If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md#340)._
@@ -120,8 +124,10 @@ _📚 Refer to the [GitHub Release Notes] for previous changelogs._
 
 <!-- PR links -->
 
+[#825]: https://github.com/munich-quantum-toolkit/qcec/pull/825
 [#817]: https://github.com/munich-quantum-toolkit/qcec/pull/817
 [#796]: https://github.com/munich-quantum-toolkit/qcec/pull/796
+[#775]: https://github.com/munich-quantum-toolkit/qcec/pull/775
 [#735]: https://github.com/munich-quantum-toolkit/qcec/pull/735
 [#730]: https://github.com/munich-quantum-toolkit/qcec/pull/730
 [#704]: https://github.com/munich-quantum-toolkit/qcec/pull/704

pyproject.toml

@@ -177,22 +177,6 @@ run.disable_warnings = [
 ]
 
 
-[tool.mypy]
-files = ["python/mqt", "test/python", "noxfile.py"]
-mypy_path = ["$MYPY_CONFIG_FILE_DIR/python"]
-python_version = "3.10"
-warn_unused_configs = true
-enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
-strict = true
-disallow_untyped_defs = false
-explicit_package_bases = true
-warn_unreachable = true
-
-[[tool.mypy.overrides]]
-module = ["qiskit.*"]
-ignore_missing_imports = true
-
-
 [tool.ty.terminal]
 # Error if ty emits any warning-level diagnostics.
 error-on-warning = true
@@ -307,6 +291,8 @@ aer = "aer"
 [tool.repo-review]
 ignore = [
   "GH200", # We use Renovate instead of Dependabot
+  "MY100", # We use ty instead of mypy
+  "PC140", # We use ty instead of mypy
   "PC160", # We use a mirror of crate-ci/typos
 ]