diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 49a1f6f..7a07d3a 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        check: ['style', 'spellcheck']
+        check: ['style', 'spellcheck', 'type']
 
     steps:
       - uses: actions/checkout@v5
diff --git a/pyproject.toml b/pyproject.toml
index 5e77976..f3a551b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ classifiers = [
 ]
 requires-python = ">=3.10"
 dependencies = [
+    "acres >=0.5",
     "attrs >=24.1",
     "bidsschematools >=1.1",
     "orjson>=3.11.3",
@@ -152,3 +153,28 @@ test = [
   "datalad >=1.1",
   "cattrs>=24.1.3",
 ]
+types = [
+    "mypy>=1.18.2",
+]
+
+[tool.mypy]
+strict = true
+exclude = [
+  "^tests/data",
+]
+
+[[tool.mypy.overrides]]
+module = 'bids_validator._version'
+ignore_errors = true
+
+[[tool.mypy.overrides]]
+module = 'datalad.*'
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = 'fsspec'
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = 'upath'
+ignore_missing_imports = true
diff --git a/src/bids_validator/__main__.py b/src/bids_validator/__main__.py
index e9ffd88..befcc7c 100644
--- a/src/bids_validator/__main__.py
+++ b/src/bids_validator/__main__.py
@@ -12,8 +12,8 @@
 from typing import Annotated
 
 from bidsschematools.schema import load_schema
-from bidsschematools.types import Namespace
 from bidsschematools.types.context import Subject
+from bidsschematools.types.namespace import Namespace
 
 from bids_validator import BIDSValidator
 from bids_validator.context import Context, Dataset, Sessions
@@ -22,11 +22,11 @@
 app = typer.Typer()
 
 
-def is_subject_dir(tree):
+def is_subject_dir(tree: FileTree) -> bool:
     return tree.name.startswith('sub-')
 
 
-def walk(tree: FileTree, dataset: Dataset, subject: Subject = None) -> Iterator[Context]:
+def walk(tree: FileTree, dataset: Dataset, subject: Subject | None = None) -> Iterator[Context]:
     """Iterate over children of a FileTree and check if they are a directory or file.
 
     If it's a directory then run again recursively, if it's a file file check the file name is
@@ -52,7 +52,7 @@ def walk(tree: FileTree, dataset: Dataset, subject: Subject = None) -> Iterator[
             yield Context(child, dataset, subject)
 
 
-def validate(tree: FileTree, schema: Namespace):
+def validate(tree: FileTree, schema: Namespace) -> None:
     """Check if the file path is BIDS compliant.
 
     Parameters
@@ -71,14 +71,14 @@ def validate(tree: FileTree, schema: Namespace):
             print(f'{file.path} is not a valid bids filename')
 
 
-def show_version():
+def show_version() -> None:
     """Show bids-validator version."""
     from . import __version__
 
     print(f'bids-validator {__version__} (Python {sys.version.split()[0]})')
 
 
-def version_callback(value: bool):
+def version_callback(value: bool) -> None:
     """Run the callback for CLI version flag.
 
     Parameters
diff --git a/src/bids_validator/bids_validator.py b/src/bids_validator/bids_validator.py
index b48f9ae..5497da3 100644
--- a/src/bids_validator/bids_validator.py
+++ b/src/bids_validator/bids_validator.py
@@ -12,6 +12,8 @@
 import bidsschematools.utils
 import bidsschematools.validator
 
+from .types import _typings as t
+
 
 class LoggingContext:
     # From logging cookbook (CC0):
@@ -35,20 +37,31 @@ class LoggingContext:
 
     """
 
-    def __init__(self, logger, level=None, handler=None, close=True):
+    def __init__(
+        self,
+        logger: logging.Logger,
+        level: int | None = None,
+        handler: logging.Handler | None = None,
+        close: bool = True,
+    ) -> None:
         self.logger = logger
         self.level = level
         self.handler = handler
         self.close = close
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         if self.level is not None:
             self.old_level = self.logger.level
             self.logger.setLevel(self.level)
         if self.handler:
             self.logger.addHandler(self.handler)
 
-    def __exit__(self, et, ev, tb):
+    def __exit__(
+        self,
+        et: type[BaseException] | None,
+        ev: BaseException | None,
+        tb: t.TracebackType,
+    ) -> None:
         if self.level is not None:
             self.logger.setLevel(self.old_level)
         if self.handler:
@@ -66,7 +79,7 @@ class BIDSValidator:
 
     regexes = None
 
-    def __init__(self, index_associated=True):
+    def __init__(self, index_associated: bool = True) -> None:
         """Initialize BIDSValidator object.
 
         Parameters
@@ -81,9 +94,9 @@ def __init__(self, index_associated=True):
         self.index_associated = index_associated
 
     @classmethod
-    def _init_regexes(cls):
+    def _init_regexes(cls) -> None:
         if cls.regexes is None:
-            with LoggingContext(bst.utils.get_logger(), level=logging.WARNING):
+            with LoggingContext(bst.utils.get_logger(), level=logging.WARNING):  # type: ignore[no-untyped-call]
                 schema = bst.schema.load_schema()
 
             all_rules = chain.from_iterable(
@@ -93,7 +106,7 @@ def _init_regexes(cls):
             cls.regexes = [rule['regex'] for rule in all_rules]
 
     @classmethod
-    def parse(cls, path):
+    def parse(cls, path: str) -> dict[str, str]:
         """Parse a file path into a dictionary of BIDS entities.
 
         Parameters
@@ -136,6 +149,7 @@ def parse(cls, path):
         """
         if cls.regexes is None:
             cls._init_regexes()
+            assert cls.regexes is not None  # noqa: S101
 
         if path.startswith(os.sep):
             path = path.replace(os.sep, '/')
@@ -155,7 +169,7 @@ def parse(cls, path):
 
     @classmethod
     @lru_cache
-    def is_bids(cls, path):
+    def is_bids(cls, path: str) -> bool:
         """Check if file path adheres to BIDS.
 
         Main method of the validator. Uses other class methods for checking
@@ -199,14 +213,14 @@ def is_bids(cls, path):
             return False
 
     @classmethod
-    def is_top_level(cls, path):
+    def is_top_level(cls, path: str) -> bool:
         """Check if the file has appropriate name for a top-level file."""
         parts = cls.parse(path)
         if not parts:
             return False
         return parts.get('subject') is None
 
-    def is_associated_data(self, path):
+    def is_associated_data(self, path: str) -> bool:
         """Check if file is appropriate associated data."""
         if not self.index_associated:
             return False
@@ -217,7 +231,7 @@ def is_associated_data(self, path):
         return parts.get('path') in ('code', 'derivatives', 'stimuli', 'sourcedata')
 
     @classmethod
-    def is_session_level(cls, path):
+    def is_session_level(cls, path: str) -> bool:
         """Check if the file has appropriate name for a session level."""
         parts = cls.parse(path)
         if not parts:
@@ -225,7 +239,7 @@ def is_session_level(cls, path):
         return parts.get('datatype') is None and parts.get('suffix') != 'sessions'
 
     @classmethod
-    def is_subject_level(cls, path):
+    def is_subject_level(cls, path: str) -> bool:
         """Check if the file has appropriate name for a subject level."""
         parts = cls.parse(path)
         if not parts:
@@ -233,7 +247,7 @@ def is_subject_level(cls, path):
         return parts.get('suffix') == 'sessions'
 
     @classmethod
-    def is_phenotypic(cls, path):
+    def is_phenotypic(cls, path: str) -> bool:
         """Check if file is phenotypic data."""
         parts = cls.parse(path)
         if not parts:
@@ -241,7 +255,7 @@ def is_phenotypic(cls, path):
         return parts.get('datatype') == 'phenotype'
 
     @classmethod
-    def is_file(cls, path):
+    def is_file(cls, path: str) -> bool:
         """Check if file is a data file or non-inherited metadata file."""
         parts = cls.parse(path)
         if not parts:
diff --git a/src/bids_validator/bidsignore.py b/src/bids_validator/bidsignore.py
index 2f7cdb1..385931e 100644
--- a/src/bids_validator/bidsignore.py
+++ b/src/bids_validator/bidsignore.py
@@ -84,7 +84,7 @@ def from_file(cls, pathlike: os.PathLike):
 
     def match(self, relpath: str) -> bool:
         """Match a relative path against a collection of ignore patterns."""
-        if any(compile_pat(pattern).match(relpath) for pattern in self.patterns if pattern):
+        if any(regex.match(relpath) for pat in self.patterns if (regex := compile_pat(pat))):
             self.history.append(relpath)
             return True
         return False
diff --git a/src/bids_validator/context.py b/src/bids_validator/context.py
index cdbc01b..43c3626 100644
--- a/src/bids_validator/context.py
+++ b/src/bids_validator/context.py
@@ -8,8 +8,8 @@
 
 import attrs
 import orjson
-from bidsschematools.types import Namespace
 from bidsschematools.types import context as ctx
+from bidsschematools.types.namespace import Namespace
 from upath import UPath
 
 from .types import _typings as t
@@ -47,7 +47,7 @@ class ValidationError(Exception):
     """TODO: Add issue structure."""
 
 
-_DATATYPE_MAP = {}
+_DATATYPE_MAP: dict[str, str] = {}
 
 
 def datatype_to_modality(datatype: str, schema: Namespace) -> str:
@@ -62,6 +62,7 @@ def datatype_to_modality(datatype: str, schema: Namespace) -> str:
 @cache
 def load_tsv(file: FileTree, *, max_rows=0) -> Namespace:
     """Load TSV contents into a Namespace."""
+    fobj: t.Iterable[str]
     with file.path_obj.open() as fobj:
         if max_rows > 0:
             fobj = itertools.islice(fobj, max_rows)
@@ -74,7 +75,7 @@ def load_tsv(file: FileTree, *, max_rows=0) -> Namespace:
 def load_tsv_gz(file: FileTree, headers: tuple[str], *, max_rows=0) -> Namespace:
     """Load TSVGZ contents into a Namespace."""
     with file.path_obj.open('rb') as fobj:
-        gzobj = gzip.GzipFile(fileobj=fobj, mode='r')
+        gzobj: t.Iterable[bytes] = gzip.GzipFile(fileobj=fobj, mode='r')
         if max_rows > 0:
             gzobj = itertools.islice(gzobj, max_rows)
         contents = (line.decode().rstrip('\r\n').split('\t') for line in gzobj)
@@ -82,7 +83,7 @@ def load_tsv_gz(file: FileTree, headers: tuple[str], *, max_rows=0) -> Namespace
 
 
 @cache
-def load_json(file: FileTree) -> dict[str]:
+def load_json(file: FileTree) -> dict[str, t.Any]:
     """Load JSON file contents."""
     return orjson.loads(file.path_obj.read_bytes())
 
@@ -116,10 +117,10 @@ def phenotype(self) -> list[str] | None:
         if 'phenotype' not in self._tree.children:
             return None
 
-        subjects = set()
-        for phenotype_file in self._tree.children['phenotype'].children:
+        subjects: set[str] = set()
+        for phenotype_file in self._tree.children['phenotype'].children.values():
             if phenotype_file.name.endswith('.tsv'):
-                subjects.update(self._get_participant_id(phenotype_file))
+                subjects.update(self._get_participant_id(phenotype_file) or [])
 
         return sorted(subjects)
 
@@ -195,13 +196,12 @@ def path(self):
         return self._file.relative_path
 
 
-def load_file(file: FileTree, dataset: proto.Dataset) -> ctx.Context:
+def load_file(file: FileTree, dataset: proto.Dataset) -> None:  # -> ctx.Context:
     """Load a full context for a given file."""
-    associations = load_associations(file, dataset)
-    _ = associations
+    # associations = load_associations(file, dataset)
 
 
-def load_associations(file: FileTree, dataset: proto.Dataset) -> ctx.Associations:
+def load_associations(file: FileTree, dataset: proto.Dataset) -> None:  # -> ctx.Associations:
     """Load all associations for a given file."""
     # If something fails, return None.
     # Uses walk back algorithm
@@ -209,7 +209,7 @@ def load_associations(file: FileTree, dataset: proto.Dataset) -> ctx.Association
     # Stops on first success
 
 
-def load_events(file: FileTree) -> ctx.Events:
+def load_events(file: FileTree) -> None:  # -> ctx.Events:
     """Load events.tsv file."""
 
 
@@ -218,10 +218,11 @@ def load_sidecar(file: FileTree) -> dict[str, t.Any]:
     # Uses walk back algorithm
     # https://bids-validator.readthedocs.io/en/latest/validation-model/inheritance-principle.html
     # Accumulates all sidecars
-    metadata = {}
+    metadata: dict[str, t.Any] = {}
 
     for json in walk_back(file, inherit=True):
-        metadata = load_json(json) | metadata
+        # May need to overload walk_back
+        metadata = load_json(json) | metadata  # type: ignore[arg-type]
 
     return metadata
 
@@ -232,7 +233,7 @@ def walk_back(
     target_extensions: tuple[str, ...] = ('.json',),
     target_suffix: str | None = None,
     target_entities: tuple[str, ...] = (),
-) -> Generator[FileTree] | Generator[list[FileTree, ...]]:
+) -> Generator[FileTree] | Generator[list[FileTree]]:
     """Walk up the file tree to find associated files."""
     for file_group in _walk_back(
         source, inherit, target_extensions, target_suffix, target_entities
@@ -251,7 +252,7 @@ def _walk_back(
     target_extensions: tuple[str, ...],
     target_suffix: str | None,
     target_entities: tuple[str, ...],
-) -> Generator[list[FileTree, ...]]:
+) -> Generator[list[FileTree]]:
     file_parts = FileParts.from_file(source)
 
     if target_suffix is None:
@@ -345,7 +346,7 @@ def path(self) -> str:
         return self.file_parts.path
 
     @property
-    def entities(self) -> dict[str, str] | None:
+    def entities(self) -> dict[str, str | None]:
         """Entities parsed from the current filename."""
         return self.file_parts.entities
 
@@ -367,7 +368,9 @@ def extension(self) -> str | None:
     @property
     def modality(self) -> str | None:
         """Modality of current file, for examples, MRI."""
-        return datatype_to_modality(self.file_parts.datatype, self.schema)
+        if (datatype := self.file_parts.datatype) is not None:
+            return datatype_to_modality(datatype, self.schema)
+        return None
 
     @property
     def size(self) -> int:
@@ -380,12 +383,14 @@ def associations(self) -> ctx.Associations:
         return ctx.Associations()
 
     @property
-    def columns(self) -> None:
+    def columns(self) -> Namespace | None:
         """TSV columns, indexed by column header, values are arrays with column contents."""
         if self.extension == '.tsv':
             return load_tsv(self.file)
         elif self.extension == '.tsv.gz':
-            return load_tsv_gz(self.file, tuple(self.sidecar.Columns))
+            columns = tuple(self.sidecar.Columns) if self.sidecar else ()
+            return load_tsv_gz(self.file, columns)
+        return None
 
     @property
     def json(self) -> Namespace | None:
diff --git a/src/bids_validator/types/_typings.py b/src/bids_validator/types/_typings.py
index dd42a78..359485a 100644
--- a/src/bids_validator/types/_typings.py
+++ b/src/bids_validator/types/_typings.py
@@ -2,18 +2,25 @@
     'Self',
     'TYPE_CHECKING',
     'Any',
+    'Iterable',
+    'TracebackType',
 )
 
 TYPE_CHECKING = False
 if TYPE_CHECKING:
+    from collections.abc import Iterable
+    from types import TracebackType
     from typing import Any, Self
 else:
 
     def __getattr__(name: str):
-        if name in __all__:
-            import typing
-
-            return getattr(typing, name)
+        match name:
+            case 'Iterable':
+                return __import__('collections.abc').Iterable
+            case 'TracebackType':
+                return __import__('types').TracebackType
+            case _:
+                return getattr(__import__('typing'), name)
 
         msg = f'Module {__name__!r} has no attribute {name!r}'
         raise AttributeError(msg)
diff --git a/src/bids_validator/types/files.py b/src/bids_validator/types/files.py
index 40db627..969dd0a 100644
--- a/src/bids_validator/types/files.py
+++ b/src/bids_validator/types/files.py
@@ -24,7 +24,7 @@ class FileTree:
     parent: FileTree | None = attrs.field(repr=False, default=None, eq=False)
     children: dict[str, FileTree] = attrs.field(repr=False, factory=dict, eq=False)
 
-    def __attrs_post_init__(self):
+    def __attrs_post_init__(self) -> None:
         if self.is_dir is None:
             object.__setattr__(self, 'is_dir', self.path_obj.is_dir())
         object.__setattr__(
@@ -34,32 +34,32 @@ def __attrs_post_init__(self):
         )
 
     @classmethod
-    def read_from_filesystem(cls, path_obj: os.PathLike) -> t.Self:
+    def read_from_filesystem(cls, path_obj: str | os.PathLike[str] | UPath) -> t.Self:
         """Read a FileTree from the filesystem."""
-        path_obj = UPath(path_obj)
+        upath_obj = UPath(path_obj)
         children = {}
-        if is_dir := path_obj.is_dir():
+        if is_dir := upath_obj.is_dir():
             children = {
-                entry.name: FileTree.read_from_filesystem(entry) for entry in path_obj.iterdir()
+                entry.name: FileTree.read_from_filesystem(entry) for entry in upath_obj.iterdir()
             }
-        return cls(path_obj, is_dir=is_dir, children=children)
+        return cls(upath_obj, is_dir=is_dir, children=children)
 
     @property
-    def name(self) -> bool:
+    def name(self) -> str:
         """The name of the current FileTree node."""
         return self.path_obj.name
 
-    def __contains__(self, relpath: os.PathLike) -> bool:
+    def __contains__(self, relpath: str | os.PathLike[str]) -> bool:
         parts = Path(relpath).parts
         if len(parts) == 0:
             return False
-        child = self.children.get(parts[0], False)
-        return child and (len(parts) == 1 or posixpath.join(*parts[1:]) in child)
+        child = self.children.get(parts[0])
+        return bool(child and (len(parts) == 1 or posixpath.join(*parts[1:]) in child))
 
     def __fspath__(self):
         return self.path_obj.__fspath__()
 
-    def __truediv__(self, relpath: str | os.PathLike) -> t.Self:
+    def __truediv__(self, relpath: str | os.PathLike) -> FileTree:
         parts = Path(relpath).parts
         child = self
         for part in parts:
diff --git a/tests/conftest.py b/tests/conftest.py
index 12fa33f..8110e7a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,5 @@
 """Pytest configuration."""
 
-import importlib.resources
 import os
 from pathlib import Path
 
@@ -8,17 +7,18 @@
 from bidsschematools.schema import load_schema
 from bidsschematools.types import Namespace
 
+from .data import load_data
+
 
 @pytest.fixture(scope='session')
 def examples() -> Path:
     """Get bids-examples from submodule, allow environment variable override."""
     ret = os.getenv('BIDS_EXAMPLES')
     if not ret:
-        ret = importlib.resources.files(__spec__.parent) / 'data' / 'bids-examples'
-        if not any(ret.iterdir()):
+        examples = load_data('bids-examples')
+        if not any(examples.iterdir()):
             pytest.skip('bids-examples submodule is not checked out')
-    else:  # pragma: no cover
-        pass
+        return examples
     return Path(ret)
 
 
@@ -27,11 +27,10 @@ def gitignore_test() -> Path:
     """Get bids-examples from submodule, allow environment variable override."""
     ret = os.getenv('GITIGNORE_TEST_DIR')
     if not ret:
-        ret = importlib.resources.files(__spec__.parent) / 'data' / 'gitignore-test'
-        if not any(ret.iterdir()):
+        test_data = load_data('gitignore-test')
+        if not any(test_data.iterdir()):
             pytest.skip('gitignore-test submodule is not checked out')
-    else:  # pragma: no cover
-        pass
+        return test_data
     return Path(ret)
 
 
diff --git a/tests/data/__init__.py b/tests/data/__init__.py
new file mode 100644
index 0000000..461c978
--- /dev/null
+++ b/tests/data/__init__.py
@@ -0,0 +1,3 @@
+from acres import Loader
+
+load_data = Loader(__spec__.name)
diff --git a/tests/test_bidsignore.py b/tests/test_bidsignore.py
index a282cff..afe9142 100644
--- a/tests/test_bidsignore.py
+++ b/tests/test_bidsignore.py
@@ -1,5 +1,6 @@
 """Test bids_validator.bidsignore."""
 
+from collections.abc import Iterator
 from pathlib import Path
 
 import pytest
@@ -43,16 +44,17 @@
         (r'\!*', ['!', '!foo'], ['foo', 'bar!']),
     ],
 )
-def test_patterns(pattern, hits, misses):
+def test_patterns(pattern: str, hits: list[str], misses: list[str]) -> None:
     """Test expected hits and misses of ignore patterns."""
     regex = compile_pat(pattern)
+    assert regex is not None
     for fname in hits:
         assert regex.match(fname), f'"{fname}" should match "{pattern}"'
     for fname in misses:
         assert not regex.match(fname), f'"{fname}" should not match "{pattern}"'
 
 
-def test_skipped_patterns():
+def test_skipped_patterns() -> None:
     """Test ignore patterns that should match nothing."""
     assert compile_pat('') is None
     assert compile_pat('# commented line') is None
@@ -61,7 +63,7 @@ def test_skipped_patterns():
         compile_pat('!inverted pattern')
 
 
-def test_Ignore_ds000117(examples):
+def test_Ignore_ds000117(examples: Path) -> None:
     """Test that we can load a .bidsignore file and match a file."""
     ds000117 = FileTree.read_from_filesystem(examples / 'ds000117')
     ignore = Ignore.from_file(ds000117.children['.bidsignore'])
@@ -78,7 +80,7 @@ def test_Ignore_ds000117(examples):
     assert ignore.match(flash_file.relative_path)
 
 
-def test_filter_file_tree(examples):
+def test_filter_file_tree(examples: Path) -> None:
     """Test file tree filtering with .bidsignore."""
     ds000117 = FileTree.read_from_filesystem(examples / 'ds000117')
     assert '.bidsignore' in ds000117
@@ -95,7 +97,7 @@ def test_filter_file_tree(examples):
     assert filtered is ds000247
 
 
-def _walk(tree: FileTree):
+def _walk(tree: FileTree) -> Iterator[FileTree]:
     for child in tree.children.values():
         if child.is_dir:
             yield from _walk(child)
@@ -103,7 +105,7 @@ def _walk(tree: FileTree):
             yield child
 
 
-def test_gitignore_battery(gitignore_test):
+def test_gitignore_battery(gitignore_test: Path) -> None:
     """Test our implementation against a gitignore battery."""
     filetree = FileTree.read_from_filesystem(gitignore_test)
     ignore = Ignore.from_file(filetree.children['.gitignore'])
diff --git a/tests/test_context.py b/tests/test_context.py
index 85b41db..a9db9d6 100644
--- a/tests/test_context.py
+++ b/tests/test_context.py
@@ -1,27 +1,30 @@
 import json
+from collections.abc import Generator
+from pathlib import Path
 
 import fsspec
 import pytest
 from bidsschematools.types.context import Subject
+from bidsschematools.types.namespace import Namespace
 
 from bids_validator import context
 from bids_validator.types.files import FileTree
 
 
 @pytest.fixture
-def synthetic_dataset(examples):
+def synthetic_dataset(examples: Path) -> FileTree:
     return FileTree.read_from_filesystem(examples / 'synthetic')
 
 
 @pytest.fixture
-def memfs():
+def memfs() -> Generator[fsspec.AbstractFileSystem, None, None]:
     mem = fsspec.filesystem('memory')
     mem.store.clear()
     yield mem
     mem.store.clear()
 
 
-def test_load(synthetic_dataset, schema):
+def test_load(synthetic_dataset: FileTree, schema: Namespace) -> None:
     ds = context.Dataset(synthetic_dataset, schema)
 
     assert ds.dataset_description.Name.startswith('Synthetic dataset')
@@ -32,7 +35,12 @@ def test_load(synthetic_dataset, schema):
 
 
 @pytest.mark.parametrize(('depth', 'expected'), [(2, {'anat', 'beh', 'func'}), (1, set())])
-def test_find_datatypes(synthetic_dataset, schema, depth, expected):
+def test_find_datatypes(
+    synthetic_dataset: FileTree,
+    schema: Namespace,
+    depth: int,
+    expected: set[str],
+) -> None:
     datatypes = schema.objects.datatypes
 
     result = context.find_datatypes(synthetic_dataset, datatypes, max_depth=depth)
@@ -40,7 +48,7 @@ def test_find_datatypes(synthetic_dataset, schema, depth, expected):
     assert result == expected
 
 
-def test_fileparts(synthetic_dataset, schema):
+def test_fileparts(synthetic_dataset: FileTree, schema: Namespace) -> None:
     T1w = synthetic_dataset / 'sub-01' / 'ses-01' / 'anat' / 'sub-01_ses-01_T1w.nii'
     parts = context.FileParts.from_file(T1w, schema)
     assert parts == context.FileParts(
@@ -53,7 +61,7 @@ def test_fileparts(synthetic_dataset, schema):
     )
 
 
-def test_walkback(synthetic_dataset, schema):
+def test_walkback(synthetic_dataset: FileTree) -> None:
     bold = (
         synthetic_dataset
         / 'sub-01'
@@ -66,7 +74,7 @@ def test_walkback(synthetic_dataset, schema):
     assert sidecars[0] is synthetic_dataset / 'task-nback_bold.json'
 
 
-def test_context(synthetic_dataset, schema):
+def test_context(synthetic_dataset: FileTree, schema: Namespace) -> None:
     sub01 = synthetic_dataset / 'sub-01'
     T1w = sub01 / 'ses-01' / 'anat' / 'sub-01_ses-01_T1w.nii'
     bold = sub01 / 'ses-01' / 'func' / 'sub-01_ses-01_task-nback_run-01_bold.nii'
@@ -84,14 +92,18 @@ def test_context(synthetic_dataset, schema):
     assert T1w_context.extension == '.nii'
     assert T1w_context.modality == 'mri'
     assert T1w_context.size == 352
+    assert T1w_context.subject is not None
     assert isinstance(T1w_context.subject.sessions, context.Sessions)
     assert sorted(T1w_context.subject.sessions.ses_dirs) == ['ses-01', 'ses-02']
+    assert T1w_context.subject.sessions.session_id is not None
     assert sorted(T1w_context.subject.sessions.session_id) == ['ses-01', 'ses-02']
+    assert T1w_context.sidecar is not None
     assert T1w_context.sidecar == {}
     assert T1w_context.json is None
 
     bold_context = context.Context(bold, ds, subject)
 
+    assert bold_context.sidecar is not None
     assert bold_context.sidecar.to_dict() == {'TaskName': 'N-Back', 'RepetitionTime': 2.5}
     assert bold_context.json is None
 
@@ -104,17 +116,18 @@ def test_context(synthetic_dataset, schema):
     #  tiff
 
 
-def test_context_json(examples, schema):
+def test_context_json(examples: Path, schema: Namespace) -> None:
     dataset = FileTree.read_from_filesystem(examples / 'qmri_vfa')
     file = dataset / 'sub-01' / 'anat' / 'sub-01_flip-1_VFA.json'
 
     ds = context.Dataset(dataset, schema)
     file_context = context.Context(file, ds, subject=None)
 
+    assert file_context.json is not None
     assert file_context.json.to_dict() == {'FlipAngle': 3, 'RepetitionTimeExcitation': 0.0150}
 
 
-def test_sidecar_inheritance(examples):
+def test_sidecar_inheritance(examples: Path) -> None:
     """Test to ensure inheritance principle is executed correctly"""
     dataset = FileTree.read_from_filesystem(examples / 'qmri_mp2rage')
     file = dataset / 'sub-1' / 'anat' / 'sub-1_inv-2_part-mag_MP2RAGE.nii'
@@ -126,7 +139,7 @@ def test_sidecar_inheritance(examples):
     assert sidecar['RepetitionTimePreparation'] == 5.5
 
 
-def test_sidecar_order(memfs):
+def test_sidecar_order(memfs: fsspec.AbstractFileSystem) -> None:
     """Test to ensure inheritance principle is skipped when inherit=False"""
     root_json = {'rootOverwriteA': 'root', 'rootOverwriteB': 'root', 'rootValue': 'root'}
     subject_json = {'rootOverwriteA': 'subject', 'subOverwrite': 'subject', 'subValue': 'subject'}
@@ -153,16 +166,17 @@ def test_sidecar_order(memfs):
     }
 
 
-def test_sessions(synthetic_dataset):
+def test_sessions(synthetic_dataset: FileTree) -> None:
     sub01 = synthetic_dataset / 'sub-01'
 
     sessions = context.Sessions(sub01)
 
     assert sorted(sessions.ses_dirs) == ['ses-01', 'ses-02']
+    assert sessions.session_id is not None
     assert sorted(sessions.session_id) == ['ses-01', 'ses-02']
 
 
-def test_load_tsv(synthetic_dataset):
+def test_load_tsv(synthetic_dataset: FileTree) -> None:
     tsv_file_tree = synthetic_dataset / 'participants.tsv'
     tsv_file = context.load_tsv(tsv_file_tree)
 
@@ -176,7 +190,7 @@ def test_load_tsv(synthetic_dataset):
     assert [tsv_file[key] == data_set[key] for key in tsv_file.keys()]
 
 
-def test_load_tsv_gz(synthetic_dataset):
+def test_load_tsv_gz(synthetic_dataset: FileTree) -> None:
     headers = ('respiratory', 'cardiac')
     tsvgz_file_tree = (
         synthetic_dataset
diff --git a/tox.ini b/tox.ini
index 596c4ed..12a3b67 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ envlist =
   py310-min
   style
   spellcheck
+  type
 skip_missing_interpreters = true
 
 # Configuration that allows us to split tests across GitHub runners effectively
@@ -27,6 +28,7 @@ DEPENDS =
 CHECK =
   style: style
   spellcheck: spellcheck
+  type: type
 
 [testenv]
 description = Pytest with coverage
@@ -87,3 +89,13 @@ runner = uv-venv-runner
 commands =
   fix: codespell -w {posargs}
   !fix: codespell {posargs}
+
+[testenv:type]
+description = Check type consistency
+basepython = python3.13
+labels = check
+dependency_groups =
+  test
+  types
+commands =
+  mypy src tests
diff --git a/uv.lock b/uv.lock
index e92ebb4..798c407 100644
--- a/uv.lock
+++ b/uv.lock
@@ -42,6 +42,7 @@ wheels = [
 name = "bids-validator"
 source = { editable = "." }
 dependencies = [
+    { name = "acres" },
     { name = "attrs" },
     { name = "bidsschematools" },
     { name = "orjson" },
@@ -61,9 +62,13 @@ test = [
     { name = "pytest" },
     { name = "pytest-cov" },
 ]
+types = [
+    { name = "mypy" },
+]
 
 [package.metadata]
 requires-dist = [
+    { name = "acres", specifier = ">=0.5" },
     { name = "attrs", specifier = ">=24.1" },
     { name = "bidsschematools", specifier = ">=1.1" },
     { name = "orjson", specifier = ">=3.11.3" },
@@ -80,6 +85,7 @@ test = [
     { name = "pytest", specifier = ">=8" },
     { name = "pytest-cov", specifier = ">=5" },
 ]
+types = [{ name = "mypy", specifier = ">=1.18.2" }]
 
 [[package]]
 name = "bidsschematools"
@@ -748,6 +754,60 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/81/f2/08ace4142eb281c12701fc3b93a10795e4d4dc7f753911d836675050f886/msgpack-1.1.2-cp314-cp314t-win_arm64.whl", hash = "sha256:d99ef64f349d5ec3293688e91486c5fdb925ed03807f64d98d205d2713c60b46", size = 70868, upload-time = "2025-10-08T09:15:44.959Z" },
 ]
 
+[[package]]
+name = "mypy"
+version = "1.18.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "mypy-extensions" },
+    { name = "pathspec" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c0/77/8f0d0001ffad290cef2f7f216f96c814866248a0b92a722365ed54648e7e/mypy-1.18.2.tar.gz", hash = "sha256:06a398102a5f203d7477b2923dda3634c36727fa5c237d8f859ef90c42a9924b", size = 3448846, upload-time = "2025-09-19T00:11:10.519Z" }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/10/e9/420822d4f661f13ca8900f5fa239b40ee3be8b62b32f3357df9a3045a08b/mypy-1.18.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:7a780ca61fc239e4865968ebc5240bb3bf610ef59ac398de9a7421b54e4a207e", size = 11896527, upload-time = "2025-09-19T00:10:55.791Z" },
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