chore: replace mypy with ty for type checking

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: slhck

.github/workflows/claude-code-review.yml

@@ -72,4 +72,4 @@ jobs:
           prompt: '/code-review:code-review ${{ github.repository }}/pull/${{ github.event.pull_request.number }}'
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
-          claude_args: '--allowed-tools "Bash(uv run pytest:*),Bash(uv run ruff:*),Bash(uv run mypy:*),Bash(python -m ffmpeg_normalize:*),Bash(gh pr:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"'
+          claude_args: '--allowed-tools "Bash(uv run pytest:*),Bash(uv run ruff:*),Bash(uv run ty check:*),Bash(python -m ffmpeg_normalize:*),Bash(gh pr:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"'

.github/workflows/claude.yml

@@ -76,4 +76,4 @@ jobs:
 
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
-          claude_args: '--allowed-tools "Bash(uv run pytest:*),Bash(uv run ruff:*),Bash(uv run mypy:*),Bash(python -m ffmpeg_normalize:*),Bash(gh:*)"'
+          claude_args: '--allowed-tools "Bash(uv run pytest:*),Bash(uv run ruff:*),Bash(uv run ty check:*),Bash(python -m ffmpeg_normalize:*),Bash(gh:*)"'

.github/workflows/python-package.yml

@@ -50,9 +50,9 @@ jobs:
       run: |
         uv run ruff check .
         uv run ruff format --check .
-    - name: Type check with mypy
+    - name: Type check with ty
       run: |
-        uv run mypy .
+        uv run ty check
     - name: Test with pytest
       run: |
         uv run pytest tests/

CLAUDE.md

@@ -15,7 +15,7 @@ ffmpeg-normalize is a Python utility for audio normalization using ffmpeg. It su
 ### Code Quality
 - `uv run ruff check .` - Linting
 - `uv run ruff format .` - Code formatting
-- `uv run mypy src/ffmpeg_normalize` - Type checking
+- `uv run ty check` - Type checking
 
 ### Installation
 - `uv sync --dev` - Install all dependencies (runtime and development)

pyproject.toml

@@ -52,19 +52,12 @@ package-data = {"ffmpeg_normalize" = ["data/**/*.json"]}
 dev = [
     "pytest>=8.1.1,<9",
     "ruff>=0.12.11",
-    "mypy>=1.0.0",
     "types-tqdm",
     "shtab>=1.7.0",
+    "ty>=0.0.24",
 ]
 
-[tool.mypy]
-python_version = "3.13"
-ignore_missing_imports = true
-exclude = ["build"]
-namespace_packages = false
-no_implicit_optional = true
-check_untyped_defs = true
-warn_return_any = true
-warn_unused_ignores = true
-show_error_codes = true
+[tool.ty.rules]
+invalid-argument-type = "warn"
+too-many-positional-arguments = "warn"