diff --git a/noxfile.py b/noxfile.py
index 2a72dfe..683ab79 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,8 +1,9 @@
 """Configure nox for the isolated test and lint environments."""
 
+import contextlib
 import os
 import tempfile
-from typing import Any
+from typing import Any, Generator
 
 import nox
 from nox.sessions import Session
@@ -34,7 +35,7 @@ nox.options.sessions = (
 
 
 @nox.session(name='format', python=MAIN_PYTHON)
-def format_(session: Session):
+def format_(session: Session) -> None:
     """Format source files with autoflake, black, and isort."""
     _begin(session)
     _install_packages(session, 'autoflake', 'black', 'isort')
@@ -54,24 +55,52 @@ def format_(session: Session):
     )
     session.run('black', '--version')
     session.run('black', *locations)
-    session.run('isort', '--version')
-    session.run('isort', *locations)
+    with _isort_fix(session):  # TODO (isort): Remove after upgrading
+        session.run('isort', '--version')
+        session.run('isort', *locations)
 
 
 @nox.session(python=MAIN_PYTHON)
-def lint(session: Session):
-    """Lint source files."""
+def lint(session: Session) -> None:
+    """Lint source files with flake8, mypy, and pylint."""
     _begin(session)
+    _install_packages(
+        session,
+        'flake8',
+        'flake8-annotations',
+        'flake8-black',
+        'flake8-expression-complexity',
+        'mypy',
+        'pylint',
+        'wemake-python-styleguide',
+    )
+    # Interpret extra arguments as locations of source files.
+    locations = session.posargs or SRC_LOCATIONS
+    session.run('flake8', '--version')
+    session.run('flake8', '--ignore=I0', *locations)  # TODO (isort): Remove flag
+    with _isort_fix(session):  # TODO (isort): Remove after upgrading
+        session.run('isort', '--version')
+        session.run('isort', '--check-only', *locations)
+    session.run('mypy', '--version')
+    session.run('mypy', *locations)
+    # Ignore errors where pylint cannot import a third-party package due its
+    # being run in an isolated environment. One way to fix this is to install
+    # all develop dependencies in this nox session, which we do not do. The
+    # whole point of static linting tools is to not rely on any package be
+    # importable at runtime. Instead, these imports are validated implicitly
+    # when the test suite is run.
+    session.run('pylint', '--version')
+    session.run('pylint', '--disable=import-error', *locations)
 
 
 @nox.session(python=[MAIN_PYTHON, NEXT_PYTHON])
-def test(session: Session):
+def test(session: Session) -> None:
     """Test the code base."""
     _begin(session)
 
 
 @nox.session(name='pre-commit', python=MAIN_PYTHON, venv_backend='none')
-def pre_commit(session: Session):
+def pre_commit(session: Session) -> None:
     """Source files must be well-formed before they enter git."""
     _begin(session)
     session.notify('format')
@@ -79,7 +108,7 @@ def pre_commit(session: Session):
 
 
 @nox.session(name='pre-merge', python=MAIN_PYTHON, venv_backend='none')
-def pre_merge(session: Session):
+def pre_merge(session: Session) -> None:
     """The test suite must pass before merges are made."""
     _begin(session)
     session.notify('test')
@@ -88,17 +117,17 @@ def pre_merge(session: Session):
 def _begin(session: Session) -> None:
     """Show generic info about a session."""
     if session.posargs:
-        print('extra arguments:', *session.posargs)
+        print('extra arguments:', *session.posargs)  # noqa:WPS421
 
     session.run('python', '--version')
 
     # Fake GNU's pwd.
     session.log('pwd')
-    print(os.getcwd())
+    print(os.getcwd())  # noqa:WPS421
 
 
 def _install_packages(
-    session: Session, *packages_or_pip_args: str, **kwargs: Any
+    session: Session, *packages_or_pip_args: str, **kwargs: Any,
 ) -> None:
     """Install packages respecting the poetry.lock file.
 
@@ -110,7 +139,7 @@ def _install_packages(
         session: the Session object
         *packages_or_pip_args: the packages to be installed or pip options
         **kwargs: passed on to nox.sessions.Session.install()
-    """
+    """  # noqa:RST210,RST213
     if session.virtualenv.reuse_existing:
         session.log(
             'No dependencies are installed as an existing environment is re-used',
@@ -131,3 +160,15 @@ def _install_packages(
         session.install(
             f'--constraint={requirements_txt.name}', *packages_or_pip_args, **kwargs,
         )
+
+
+# TODO (isort): Remove this fix after
+# upgrading to isort ^5.2.2 in pyproject.toml.
+@contextlib.contextmanager
+def _isort_fix(session: Session) -> Generator:
+    """Temporarily upgrade to isort 5.2.2."""
+    session.install('isort==5.2.2')
+    try:
+        yield
+    finally:
+        session.install('isort==4.3.21')
diff --git a/poetry.lock b/poetry.lock
index ffceece..2c6ed11 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -17,6 +17,38 @@ version = "1.12.0"
 [package.extras]
 test = ["coverage", "flake8", "pexpect", "wheel"]
 
+[[package]]
+category = "dev"
+description = "Read/rewrite/write Python ASTs"
+name = "astor"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "0.8.1"
+
+[[package]]
+category = "dev"
+description = "Pretty print the output of python stdlib `ast.parse`."
+name = "astpretty"
+optional = false
+python-versions = ">=3.6.1"
+version = "2.0.0"
+
+[package.extras]
+typed = ["typed-ast"]
+
+[[package]]
+category = "dev"
+description = "An abstract syntax tree for Python with inference support."
+name = "astroid"
+optional = false
+python-versions = ">=3.5"
+version = "2.4.2"
+
+[package.dependencies]
+lazy-object-proxy = ">=1.4.0,<1.5.0"
+six = ">=1.12,<2.0"
+wrapt = ">=1.11,<2.0"
+
 [[package]]
 category = "dev"
 description = "Classes Without Boilerplate"
@@ -42,6 +74,21 @@ version = "1.3.1"
 [package.dependencies]
 pyflakes = ">=1.1.0"
 
+[[package]]
+category = "dev"
+description = "Security oriented static analyser for python code."
+name = "bandit"
+optional = false
+python-versions = "*"
+version = "1.6.2"
+
+[package.dependencies]
+GitPython = ">=1.0.1"
+PyYAML = ">=3.13"
+colorama = ">=0.3.9"
+six = ">=1.10.0"
+stevedore = ">=1.20.0"
+
 [[package]]
 category = "dev"
 description = "The uncompromising code formatter."
@@ -73,7 +120,7 @@ version = "7.1.2"
 [[package]]
 category = "dev"
 description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\""
+marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
 name = "colorama"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
@@ -90,6 +137,14 @@ version = "4.2.1"
 [package.dependencies]
 colorama = "*"
 
+[[package]]
+category = "dev"
+description = "A utility for ensuring Google-style docstrings stay up to date with the source code."
+name = "darglint"
+optional = false
+python-versions = ">=3.5,<4.0"
+version = "1.5.2"
+
 [[package]]
 category = "dev"
 description = "Distribution utilities"
@@ -98,6 +153,22 @@ optional = false
 python-versions = "*"
 version = "0.3.1"
 
+[[package]]
+category = "dev"
+description = "Docutils -- Python Documentation Utilities"
+name = "docutils"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.16"
+
+[[package]]
+category = "dev"
+description = "Removes commented-out code."
+name = "eradicate"
+optional = false
+python-versions = "*"
+version = "1.0"
+
 [[package]]
 category = "dev"
 description = "A platform independent file lock."
@@ -106,18 +177,290 @@ optional = false
 python-versions = "*"
 version = "3.0.12"
 
+[[package]]
+category = "dev"
+description = "the modular source code checker: pep8 pyflakes and co"
+name = "flake8"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "3.8.3"
+
+[package.dependencies]
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.6.0a1,<2.7.0"
+pyflakes = ">=2.2.0,<2.3.0"
+
+[[package]]
+category = "dev"
+description = "Flake8 Type Annotation Checks"
+name = "flake8-annotations"
+optional = false
+python-versions = ">=3.6.1,<4.0.0"
+version = "2.3.0"
+
+[package.dependencies]
+flake8 = ">=3.7,<3.9"
+
+[[package]]
+category = "dev"
+description = "Automated security testing with bandit and flake8."
+name = "flake8-bandit"
+optional = false
+python-versions = "*"
+version = "2.1.2"
+
+[package.dependencies]
+bandit = "*"
+flake8 = "*"
+flake8-polyfill = "*"
+pycodestyle = "*"
+
+[[package]]
+category = "dev"
+description = "flake8 plugin to call black as a code style validator"
+name = "flake8-black"
+optional = false
+python-versions = "*"
+version = "0.2.1"
+
+[package.dependencies]
+black = "*"
+flake8 = ">=3.0.0"
+
+[[package]]
+category = "dev"
+description = "Flake8 plugin to forbid backslashes for line breaks"
+name = "flake8-broken-line"
+optional = false
+python-versions = ">=3.6,<4.0"
+version = "0.2.1"
+
+[package.dependencies]
+flake8 = ">=3.5,<4.0"
+
+[[package]]
+category = "dev"
+description = "A plugin for flake8 finding likely bugs and design problems in your program. Contains warnings that don't belong in pyflakes and pycodestyle."
+name = "flake8-bugbear"
+optional = false
+python-versions = ">=3.5"
+version = "19.8.0"
+
+[package.dependencies]
+attrs = "*"
+flake8 = ">=3.0.0"
+
+[[package]]
+category = "dev"
+description = "Flake8 lint for trailing commas."
+name = "flake8-commas"
+optional = false
+python-versions = "*"
+version = "2.0.0"
+
+[package.dependencies]
+flake8 = ">=2,<4.0.0"
+
+[[package]]
+category = "dev"
+description = "A flake8 plugin to help you write better list/set/dict comprehensions."
+name = "flake8-comprehensions"
+optional = false
+python-versions = ">=3.5"
+version = "3.2.3"
+
+[package.dependencies]
+flake8 = ">=3.0,<3.2.0 || >3.2.0,<4"
+
+[[package]]
+category = "dev"
+description = "ipdb/pdb statement checker plugin for flake8"
+name = "flake8-debugger"
+optional = false
+python-versions = "*"
+version = "3.2.1"
+
+[package.dependencies]
+flake8 = ">=1.5"
+pycodestyle = "*"
+
+[[package]]
+category = "dev"
+description = "Extension for flake8 which uses pydocstyle to check docstrings"
+name = "flake8-docstrings"
+optional = false
+python-versions = "*"
+version = "1.5.0"
+
+[package.dependencies]
+flake8 = ">=3"
+pydocstyle = ">=2.1"
+
+[[package]]
+category = "dev"
+description = "Flake8 plugin to find commented out code"
+name = "flake8-eradicate"
+optional = false
+python-versions = ">=3.6,<4.0"
+version = "0.3.0"
+
+[package.dependencies]
+attrs = "*"
+eradicate = ">=1.0,<2.0"
+flake8 = ">=3.5,<4.0"
+
+[[package]]
+category = "dev"
+description = "A flake8 extension that checks expressions complexity"
+name = "flake8-expression-complexity"
+optional = false
+python-versions = ">=3.6"
+version = "0.0.8"
+
+[package.dependencies]
+astpretty = "*"
+flake8 = "*"
+setuptools = "*"
+
+[[package]]
+category = "dev"
+description = "flake8 plugin that integrates isort ."
+name = "flake8-isort"
+optional = false
+python-versions = "*"
+version = "3.0.1"
+
+[package.dependencies]
+flake8 = ">=3.2.1,<4"
+testfixtures = ">=6.8.0,<7"
+
+[package.dependencies.isort]
+extras = ["pyproject"]
+version = ">=4.3.5,<5"
+
+[package.extras]
+test = ["pytest (>=4.0.2,<6)"]
+
+[[package]]
+category = "dev"
+description = "Polyfill package for Flake8 plugins"
+name = "flake8-polyfill"
+optional = false
+python-versions = "*"
+version = "1.0.2"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+category = "dev"
+description = "Flake8 lint for quotes."
+name = "flake8-quotes"
+optional = false
+python-versions = "*"
+version = "2.1.2"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+category = "dev"
+description = "Python docstring reStructuredText (RST) validator"
+name = "flake8-rst-docstrings"
+optional = false
+python-versions = "*"
+version = "0.0.12"
+
+[package.dependencies]
+flake8 = ">=3.0.0"
+restructuredtext_lint = "*"
+
+[[package]]
+category = "dev"
+description = "string format checker, plugin for flake8"
+name = "flake8-string-format"
+optional = false
+python-versions = "*"
+version = "0.2.3"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+category = "dev"
+description = "Git Object Database"
+name = "gitdb"
+optional = false
+python-versions = ">=3.4"
+version = "4.0.5"
+
+[package.dependencies]
+smmap = ">=3.0.1,<4"
+
+[[package]]
+category = "dev"
+description = "Python Git Library"
+name = "gitpython"
+optional = false
+python-versions = ">=3.4"
+version = "3.1.7"
+
+[package.dependencies]
+gitdb = ">=4.0.1,<5"
+
 [[package]]
 category = "dev"
 description = "A Python utility / library to sort Python imports."
 name = "isort"
 optional = false
-python-versions = ">=3.6,<4.0"
-version = "5.2.2"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
-pipfile_deprecated_finder = ["pipreqs", "requirementslib", "tomlkit (>=0.5.3)"]
-requirements_deprecated_finder = ["pipreqs", "pip-api"]
+pipfile = ["pipreqs", "requirementslib"]
+pyproject = ["toml"]
+requirements = ["pipreqs", "pip-api"]
+xdg_home = ["appdirs (>=1.4.0)"]
+
+[[package]]
+category = "dev"
+description = "A fast and thorough lazy object proxy."
+name = "lazy-object-proxy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.3"
+
+[[package]]
+category = "dev"
+description = "McCabe checker, plugin for flake8"
+name = "mccabe"
+optional = false
+python-versions = "*"
+version = "0.6.1"
+
+[[package]]
+category = "dev"
+description = "Optional static typing for Python"
+name = "mypy"
+optional = false
+python-versions = ">=3.5"
+version = "0.782"
+
+[package.dependencies]
+mypy-extensions = ">=0.4.3,<0.5.0"
+typed-ast = ">=1.4.0,<1.5.0"
+typing-extensions = ">=3.7.4"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+
+[[package]]
+category = "dev"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+name = "mypy-extensions"
+optional = false
+python-versions = "*"
+version = "0.4.3"
 
 [[package]]
 category = "dev"
@@ -144,6 +487,25 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "0.8.0"
 
+[[package]]
+category = "dev"
+description = "Python Build Reasonableness"
+name = "pbr"
+optional = false
+python-versions = "*"
+version = "5.4.5"
+
+[[package]]
+category = "dev"
+description = "Check PEP-8 naming conventions, plugin for flake8"
+name = "pep8-naming"
+optional = false
+python-versions = "*"
+version = "0.9.1"
+
+[package.dependencies]
+flake8-polyfill = ">=1.0.2,<2"
+
 [[package]]
 category = "dev"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
@@ -152,6 +514,25 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.9.0"
 
+[[package]]
+category = "dev"
+description = "Python style guide checker"
+name = "pycodestyle"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.6.0"
+
+[[package]]
+category = "dev"
+description = "Python docstring style checker"
+name = "pydocstyle"
+optional = false
+python-versions = ">=3.5"
+version = "5.0.2"
+
+[package.dependencies]
+snowballstemmer = "*"
+
 [[package]]
 category = "dev"
 description = "passive checker of Python programs"
@@ -160,6 +541,37 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.2.0"
 
+[[package]]
+category = "dev"
+description = "Pygments is a syntax highlighting package written in Python."
+name = "pygments"
+optional = false
+python-versions = ">=3.5"
+version = "2.6.1"
+
+[[package]]
+category = "dev"
+description = "python code static checker"
+name = "pylint"
+optional = false
+python-versions = ">=3.5.*"
+version = "2.5.3"
+
+[package.dependencies]
+astroid = ">=2.4.0,<=2.5"
+colorama = "*"
+isort = ">=4.2.5,<5"
+mccabe = ">=0.6,<0.7"
+toml = ">=0.7.1"
+
+[[package]]
+category = "dev"
+description = "YAML parser and emitter for Python"
+name = "pyyaml"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.3.1"
+
 [[package]]
 category = "dev"
 description = "Alternative regular expression module, to replace re."
@@ -168,6 +580,17 @@ optional = false
 python-versions = "*"
 version = "2020.7.14"
 
+[[package]]
+category = "dev"
+description = "reStructuredText linter"
+name = "restructuredtext-lint"
+optional = false
+python-versions = "*"
+version = "1.3.1"
+
+[package.dependencies]
+docutils = ">=0.11,<1.0"
+
 [[package]]
 category = "dev"
 description = "Python 2 and 3 compatibility utilities"
@@ -176,6 +599,46 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "1.15.0"
 
+[[package]]
+category = "dev"
+description = "A pure Python implementation of a sliding window memory map manager"
+name = "smmap"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "3.0.4"
+
+[[package]]
+category = "dev"
+description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+name = "snowballstemmer"
+optional = false
+python-versions = "*"
+version = "2.0.0"
+
+[[package]]
+category = "dev"
+description = "Manage dynamic plugins for Python applications"
+name = "stevedore"
+optional = false
+python-versions = ">=3.6"
+version = "3.2.0"
+
+[package.dependencies]
+pbr = ">=2.0.0,<2.1.0 || >2.1.0"
+
+[[package]]
+category = "dev"
+description = "A collection of helpers and mock objects for unit tests and doc tests."
+name = "testfixtures"
+optional = false
+python-versions = "*"
+version = "6.14.1"
+
+[package.extras]
+build = ["setuptools-git", "wheel", "twine"]
+docs = ["sphinx", "zope.component", "sybil", "twisted", "mock", "django (<2)", "django"]
+test = ["pytest (>=3.6)", "pytest-cov", "pytest-django", "zope.component", "sybil", "twisted", "mock", "django (<2)", "django"]
+
 [[package]]
 category = "dev"
 description = "Python Library for Tom's Obvious, Minimal Language"
@@ -192,6 +655,14 @@ optional = false
 python-versions = "*"
 version = "1.4.1"
 
+[[package]]
+category = "dev"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+name = "typing-extensions"
+optional = false
+python-versions = "*"
+version = "3.7.4.2"
+
 [[package]]
 category = "dev"
 description = "Virtual Python Environment builder"
@@ -210,8 +681,45 @@ six = ">=1.9.0,<2"
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
 testing = ["coverage (>=5)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-xdist (>=1.31.0)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
 
+[[package]]
+category = "dev"
+description = "The strictest and most opinionated python linter ever"
+name = "wemake-python-styleguide"
+optional = false
+python-versions = ">=3.6,<4.0"
+version = "0.14.1"
+
+[package.dependencies]
+astor = ">=0.8,<0.9"
+attrs = "*"
+darglint = ">=1.2,<2.0"
+flake8 = ">=3.7,<4.0"
+flake8-bandit = ">=2.1,<3.0"
+flake8-broken-line = ">=0.2,<0.3"
+flake8-bugbear = ">=19.3,<20.0"
+flake8-commas = ">=2.0,<3.0"
+flake8-comprehensions = ">=3.1.0,<4.0.0"
+flake8-debugger = ">=3.1,<4.0"
+flake8-docstrings = ">=1.3.1,<2.0.0"
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+    {file = "mypy-0.782-py3-none-any.whl", hash = "sha256:e0b61738ab504e656d1fe4ff0c0601387a5489ca122d55390ade31f9ca0e252d"},
+    {file = "mypy-0.782.tar.gz", hash = "sha256:eff7d4a85e9eea55afa34888dfeaccde99e7520b51f867ac28a48492c0b1130c"},
+]
+mypy-extensions = [
+    {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
+    {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
 ]
 nox = [
     {file = "nox-2020.5.24-py3-none-any.whl", hash = "sha256:c4509621fead99473a1401870e680b0aadadce5c88440f0532863595176d64c1"},
@@ -267,14 +919,51 @@ pathspec = [
     {file = "pathspec-0.8.0-py2.py3-none-any.whl", hash = "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0"},
     {file = "pathspec-0.8.0.tar.gz", hash = "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"},
 ]
+pbr = [
+    {file = "pbr-5.4.5-py2.py3-none-any.whl", hash = "sha256:579170e23f8e0c2f24b0de612f71f648eccb79fb1322c814ae6b3c07b5ba23e8"},
+    {file = "pbr-5.4.5.tar.gz", hash = "sha256:07f558fece33b05caf857474a366dfcc00562bca13dd8b47b2b3e22d9f9bf55c"},
+]
+pep8-naming = [
+    {file = "pep8-naming-0.9.1.tar.gz", hash = "sha256:a33d38177056321a167decd6ba70b890856ba5025f0a8eca6a3eda607da93caf"},
+    {file = "pep8_naming-0.9.1-py2.py3-none-any.whl", hash = "sha256:45f330db8fcfb0fba57458c77385e288e7a3be1d01e8ea4268263ef677ceea5f"},
+]
 py = [
     {file = "py-1.9.0-py2.py3-none-any.whl", hash = "sha256:366389d1db726cd2fcfc79732e75410e5fe4d31db13692115529d34069a043c2"},
     {file = "py-1.9.0.tar.gz", hash = "sha256:9ca6883ce56b4e8da7e79ac18787889fa5206c79dcc67fb065376cd2fe03f342"},
 ]
+pycodestyle = [
+    {file = "pycodestyle-2.6.0-py2.py3-none-any.whl", hash = "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367"},
+    {file = "pycodestyle-2.6.0.tar.gz", hash = "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"},
+]
+pydocstyle = [
+    {file = "pydocstyle-5.0.2-py3-none-any.whl", hash = "sha256:da7831660b7355307b32778c4a0dbfb137d89254ef31a2b2978f50fc0b4d7586"},
+    {file = "pydocstyle-5.0.2.tar.gz", hash = "sha256:f4f5d210610c2d153fae39093d44224c17429e2ad7da12a8b419aba5c2f614b5"},
+]
 pyflakes = [
     {file = "pyflakes-2.2.0-py2.py3-none-any.whl", hash = "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92"},
     {file = "pyflakes-2.2.0.tar.gz", hash = "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"},
 ]
+pygments = [
+    {file = "Pygments-2.6.1-py3-none-any.whl", hash = "sha256:ff7a40b4860b727ab48fad6360eb351cc1b33cbf9b15a0f689ca5353e9463324"},
+    {file = "Pygments-2.6.1.tar.gz", hash = "sha256:647344a061c249a3b74e230c739f434d7ea4d8b1d5f3721bc0f3558049b38f44"},
+]
+pylint = [
+    {file = "pylint-2.5.3-py3-none-any.whl", hash = "sha256:d0ece7d223fe422088b0e8f13fa0a1e8eb745ebffcb8ed53d3e95394b6101a1c"},
+    {file = "pylint-2.5.3.tar.gz", hash = "sha256:7dd78437f2d8d019717dbf287772d0b2dbdfd13fc016aa7faa08d67bccc46adc"},
+]
+pyyaml = [
+    {file = "PyYAML-5.3.1-cp27-cp27m-win32.whl", hash = "sha256:74809a57b329d6cc0fdccee6318f44b9b8649961fa73144a98735b0aaf029f1f"},
+    {file = "PyYAML-5.3.1-cp27-cp27m-win_amd64.whl", hash = "sha256:240097ff019d7c70a4922b6869d8a86407758333f02203e0fc6ff79c5dcede76"},
+    {file = "PyYAML-5.3.1-cp35-cp35m-win32.whl", hash = "sha256:4f4b913ca1a7319b33cfb1369e91e50354d6f07a135f3b901aca02aa95940bd2"},
+    {file = "PyYAML-5.3.1-cp35-cp35m-win_amd64.whl", hash = "sha256:cc8955cfbfc7a115fa81d85284ee61147059a753344bc51098f3ccd69b0d7e0c"},
+    {file = "PyYAML-5.3.1-cp36-cp36m-win32.whl", hash = "sha256:7739fc0fa8205b3ee8808aea45e968bc90082c10aef6ea95e855e10abf4a37b2"},
+    {file = "PyYAML-5.3.1-cp36-cp36m-win_amd64.whl", hash = "sha256:69f00dca373f240f842b2931fb2c7e14ddbacd1397d57157a9b005a6a9942648"},
+    {file = "PyYAML-5.3.1-cp37-cp37m-win32.whl", hash = "sha256:d13155f591e6fcc1ec3b30685d50bf0711574e2c0dfffd7644babf8b5102ca1a"},
+    {file = "PyYAML-5.3.1-cp37-cp37m-win_amd64.whl", hash = "sha256:73f099454b799e05e5ab51423c7bcf361c58d3206fa7b0d555426b1f4d9a3eaf"},
+    {file = "PyYAML-5.3.1-cp38-cp38-win32.whl", hash = "sha256:06a0d7ba600ce0b2d2fe2e78453a470b5a6e000a985dd4a4e54e436cc36b0e97"},
+    {file = "PyYAML-5.3.1-cp38-cp38-win_amd64.whl", hash = "sha256:95f71d2af0ff4227885f7a6605c37fd53d3a106fcab511b8860ecca9fcf400ee"},
+    {file = "PyYAML-5.3.1.tar.gz", hash = "sha256:b8eac752c5e14d3eca0e6dd9199cd627518cb5ec06add0de9d32baeee6fe645d"},
+]
 regex = [
     {file = "regex-2020.7.14-cp27-cp27m-win32.whl", hash = "sha256:e46d13f38cfcbb79bfdb2964b0fe12561fe633caf964a77a5f8d4e45fe5d2ef7"},
     {file = "regex-2020.7.14-cp27-cp27m-win_amd64.whl", hash = "sha256:6961548bba529cac7c07af2fd4d527c5b91bb8fe18995fed6044ac22b3d14644"},
@@ -298,10 +987,29 @@ regex = [
     {file = "regex-2020.7.14-cp38-cp38-win_amd64.whl", hash = "sha256:7a2dd66d2d4df34fa82c9dc85657c5e019b87932019947faece7983f2089a840"},
     {file = "regex-2020.7.14.tar.gz", hash = "sha256:3a3af27a8d23143c49a3420efe5b3f8cf1a48c6fc8bc6856b03f638abc1833bb"},
 ]
+restructuredtext-lint = [
+    {file = "restructuredtext_lint-1.3.1.tar.gz", hash = "sha256:470e53b64817211a42805c3a104d2216f6f5834b22fe7adb637d1de4d6501fb8"},
+]
 six = [
     {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
     {file = "six-1.15.0.tar.gz", hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"},
 ]
+smmap = [
+    {file = "smmap-3.0.4-py2.py3-none-any.whl", hash = "sha256:54c44c197c819d5ef1991799a7e30b662d1e520f2ac75c9efbeb54a742214cf4"},
+    {file = "smmap-3.0.4.tar.gz", hash = "sha256:9c98bbd1f9786d22f14b3d4126894d56befb835ec90cef151af566c7e19b5d24"},
+]
+snowballstemmer = [
+    {file = "snowballstemmer-2.0.0-py2.py3-none-any.whl", hash = "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0"},
+    {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
+]
+stevedore = [
+    {file = "stevedore-3.2.0-py3-none-any.whl", hash = "sha256:c8f4f0ebbc394e52ddf49de8bcc3cf8ad2b4425ebac494106bbc5e3661ac7633"},
+    {file = "stevedore-3.2.0.tar.gz", hash = "sha256:38791aa5bed922b0a844513c5f9ed37774b68edc609e5ab8ab8d8fe0ce4315e5"},
+]
+testfixtures = [
+    {file = "testfixtures-6.14.1-py2.py3-none-any.whl", hash = "sha256:30566e24a1b34e4d3f8c13abf62557d01eeb4480bcb8f1745467bfb0d415a7d9"},
+    {file = "testfixtures-6.14.1.tar.gz", hash = "sha256:58d2b3146d93bc5ddb0cd24e0ccacb13e29bdb61e5c81235c58f7b8ee4470366"},
+]
 toml = [
     {file = "toml-0.10.1-py2.py3-none-any.whl", hash = "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"},
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
@@ -329,7 +1037,19 @@ typed-ast = [
     {file = "typed_ast-1.4.1-cp39-cp39-macosx_10_15_x86_64.whl", hash = "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34"},
     {file = "typed_ast-1.4.1.tar.gz", hash = "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b"},
 ]
+typing-extensions = [
+    {file = "typing_extensions-3.7.4.2-py2-none-any.whl", hash = "sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392"},
+    {file = "typing_extensions-3.7.4.2-py3-none-any.whl", hash = "sha256:6e95524d8a547a91e08f404ae485bbb71962de46967e1b71a0cb89af24e761c5"},
+    {file = "typing_extensions-3.7.4.2.tar.gz", hash = "sha256:79ee589a3caca649a9bfd2a8de4709837400dfa00b6cc81962a1e6a1815969ae"},
+]
 virtualenv = [
     {file = "virtualenv-20.0.29-py2.py3-none-any.whl", hash = "sha256:8aa9c37b082664dbce2236fa420759c02d64109d8e6013593ad13914718a30fd"},
     {file = "virtualenv-20.0.29.tar.gz", hash = "sha256:f14a0a98ea4397f0d926cff950361766b6a73cd5975ae7eb259d12919f819a25"},
 ]
+wemake-python-styleguide = [
+    {file = "wemake-python-styleguide-0.14.1.tar.gz", hash = "sha256:e13dc580fa56b7b548de8da170bccb8ddff2d4ab026ca987db8a9893bf8a7b5b"},
+    {file = "wemake_python_styleguide-0.14.1-py3-none-any.whl", hash = "sha256:73a501e0547275287a2b926515c000cc25026a8bceb9dcc1bf73ef85a223a3c6"},
+]
+wrapt = [
+    {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 8fe4449..b63b74f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ requires = ["poetry>=0.12"]
 
 [tool.black]
 line-length = 88
-skip-string-normalization = true
+skip-string-normalization = true  # wemake-python-styleguide enforces single quotes
 target-version = ["py38"]
 
 [tool.poetry]
@@ -34,4 +34,13 @@ nox = "^2020.5.24"
 # Code Formatters
 autoflake = "^1.3.1"
 black = "^19.10b0"
-isort = "^5.2.2"
+isort = "^4.3.21"  # TODO (isort): not ^5.2.2 due to pylint and wemake-python-styleguide
+
+# (Static) Code Analyzers
+flake8 = "^3.8.3"
+flake8-annotations = "^2.3.0"
+flake8-black = "^0.2.1"
+flake8-expression-complexity = "^0.0.8"
+mypy = "^0.782"
+pylint = "^2.5.3"
+wemake-python-styleguide = "^0.14.1"  # flake8 plug-in
diff --git a/setup.cfg b/setup.cfg
index 534a0f5..93815ad 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,6 +2,111 @@
 # black's settings are in pyproject.toml => [tool.black]
 
 
+[flake8]
+# Include error classes only explicitly
+# to avoid forward compatibility issues.
+select =
+    # =============
+    # flake8's base
+    # =============
+    # mccabe => cyclomatic complexity
+    C901,
+    # pycodestyle => PEP8 compliance
+    E, W,
+    # pyflakes => basic errors
+    F4, F5, F6, F7, F8, F9
+    # ========================
+    # wemake-python-styleguide
+    # Source: https://wemake-python-stylegui.de/en/latest/pages/usage/violations/index.html
+    # ========================
+    WPS1, WPS2, WPS3, WPS4, WPS5, WPS6,
+    # darglint => docstring matches implementation
+    DAR0, DAR1, DAR2, DAR3, DAR4, DAR5,
+    # flake8-bandit => common security issues
+    S1, S2, S3, S4, S5, S6, S7,
+    # flake8-broken-line => no \ to end a line
+    N400,
+    # flake8-bugbear => opinionated bugs and design flaws
+    B0, B3, B9,
+    # flake8-commas => better comma placements
+    C8,
+    # flake8-comprehensions => better comprehensions
+    C4,
+    # flake8-debugger => no debugger usage
+    T100,
+    # flake8-docstrings => PEP257 compliance
+    D1, D2, D3, D4,
+    # flake8-eradicate => no commented out code
+    E800,
+    # flake8-isort => isort would make changes
+    I0,
+    # flake8-rst-docstrings => valid rst in docstrings
+    RST2, RST3, RST4,
+    # flake8-string-format => unify usage of str.format()
+    P1, P2, P3,
+    # flake8-quotes => use double quotes everywhere (complying with black)
+    Q0,
+    # pep8-naming
+    N8,
+    # =====
+    # other
+    # =====
+    # flake8-annotations => enforce type checking for functions
+    ANN0, ANN2, ANN3,
+    # flake8-black => complain if black would make changes
+    BLK1, BLK9,
+    # flake8-expression-complexity => not too many expressions at once
+    ECE001,
+
+# By default, flake8 ignores some errors.
+# Instead, do not ignore anything.
+ignore =
+
+# If --ignore is passed on the command
+# line, still ignore the following:
+extend-ignore =
+    # Comply with black's style.
+    # Source: https://github.com/psf/black/blob/master/docs/compatible_configs.md#flake8
+    E203, W503,
+    # f-strings are ok.
+    WPS305,
+
+per-file-ignores =
+    noxfile.py:
+        # TODO (isort): Check if still too many module members.
+        WPS202,
+        # TODO (isort): Remove after simplifying the nox session "lint".
+        WPS213,
+        # No overuse of string constants (e.g., '--version').
+        WPS226,
+
+# Explicitly set mccabe's maximum complexity to 10 as recommended by
+# Thomas McCabe, the inventor of the McCabe complexity, and the NIST.
+# Source: https://en.wikipedia.org/wiki/Cyclomatic_complexity#Limiting_complexity_during_development
+max-complexity = 10
+
+# Comply with black's style.
+# Source: https://github.com/psf/black/blob/master/docs/the_black_code_style.md#line-length
+max-line-length = 88
+
+# Preview the code lines that cause errors.
+show-source = true
+
+# ===================================
+# wemake-python-styleguide's settings
+# ===================================
+allowed-domain-names =
+    result,
+min-name-length = 3
+max-name-length = 40
+# darglint
+strictness = long
+# flake8-docstrings
+docstring-convention = google
+# flake8-eradicate
+eradicate-aggressive = true
+
+
 [isort]
 atomic = true
 case_sensitive = true
@@ -24,3 +129,42 @@ use_parentheses = true
 # Source: https://google.github.io/styleguide/pyguide.html#313-imports-formatting
 force_single_line = true
 single_line_exclusions = typing
+
+
+[mypy]
+cache_dir = .cache/mypy
+
+[mypy-nox.*]
+ignore_missing_imports = true
+
+
+[pylint.FORMAT]
+# Comply with black's style.
+max-line-length = 88
+
+[pylint.MESSAGES CONTROL]
+disable =
+    # We use TODO's to indicate locations in the source base
+    # that must be worked on in the near future.
+    fixme,
+    # Comply with black's style.
+    bad-continuation, bad-whitespace,
+    # =====================
+    # flake8 de-duplication
+    # Source: https://pylint.pycqa.org/en/latest/faq.html#i-am-using-another-popular-linter-alongside-pylint-which-messages-should-i-disable-to-avoid-duplicates
+    # =====================
+    # mccabe
+    too-many-branches,
+    # pep8-naming
+    bad-classmethod-argument, bad-mcs-classmethod-argument,
+    invalid-name, no-self-argument,
+    # pycodestyle
+    bad-indentation, bare-except, line-too-long, missing-final-newline,
+    multiple-statements, trailing-whitespace, unnecessary-semicolon, unneeded-not,
+    # pydocstyle
+    missing-class-docstring, missing-function-docstring, missing-module-docstring,
+    # pyflakes
+    undefined-variable, unused-import, unused-variable,
+
+[pylint.REPORTS]
+score = no