chore(typing): add ty type checker to CI with baseline exclusions

.github/workflows/quality_check.yml

@@ -14,7 +14,6 @@ name: Quality check - check code
 #
 # Always triggered on new PRs, PR changes and PR merge.
 
-
 on:
   pull_request:
     paths:
@@ -46,13 +45,13 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python-version: ["3.10","3.11","3.12","3.13","3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     env:
       PYTHON: "${{ matrix.python-version }}"
     permissions:
-      contents: read  # checkout code only
+      contents: read # checkout code only
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Install poetry
         run: pipx install poetry
       - name: Set up Python ${{ matrix.python-version }}
@@ -65,8 +64,10 @@ jobs:
         run: make format-check
       - name: Formatting and Linting
         run: make lint
-      - name: Static type checking
+      - name: Static type checking (mypy)
         run: make mypy
+      - name: Static type checking (ty)
+        run: make ty
       - name: Test with pytest
         run: make test
       - name: Test dependencies with Nox

Makefile

@@ -100,6 +100,8 @@ changelog:
 mypy:
 	poetry run mypy --pretty aws_lambda_powertools examples
 
+ty:
+	poetry run ty check .
 
 dev-version-plugin:
 	poetry self add git+https://github.com/monim67/poetry-bumpversion@348de6f247222e2953d649932426e63492e0a6bf

pyproject.toml

@@ -129,6 +129,7 @@ mkdocs-llmstxt = ">=0.2,<0.5"
 avro = "^1.12.0"
 protobuf = "^6.30.2"
 types-protobuf = "^6.30.2.20250516"
+ty = "^0.0.10"
 
 [tool.coverage.run]
 source = ["aws_lambda_powertools"]
@@ -215,3 +216,30 @@ generate-setup-file = true
 [tool.poetry_bumpversion.file."aws_lambda_powertools/shared/version.py"]
 search = 'VERSION = "{current_version}"'
 replace = 'VERSION = "{new_version}"'
+
+[tool.ty]
+# ty type checker configuration
+
+[tool.ty.src]
+include = ["aws_lambda_powertools/**"]
+exclude = [
+    "tests/**",
+    "examples/**",
+    "docs/**",
+    # Baseline exclusions - modules with existing diagnostics (issue #7927)
+    # These will be addressed incrementally in follow-up PRs
+    "aws_lambda_powertools/logging/**",
+    "aws_lambda_powertools/utilities/validation/**",
+    "aws_lambda_powertools/shared/**",
+    "aws_lambda_powertools/metrics/**",
+    "aws_lambda_powertools/middleware_factory/**",
+    "aws_lambda_powertools/utilities/streaming/**",
+    "aws_lambda_powertools/utilities/parameters/**",
+    "aws_lambda_powertools/utilities/parser/**",
+    "aws_lambda_powertools/utilities/data_masking/**",
+    "aws_lambda_powertools/tracing/**",
+    "aws_lambda_powertools/utilities/data_classes/**",
+    "aws_lambda_powertools/utilities/batch/**",
+    "aws_lambda_powertools/utilities/idempotency/**",
+    "aws_lambda_powertools/event_handler/**",
+]