diff --git a/.gitignore b/.gitignore
index 8d5f48eb..6f34d489 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,6 +45,7 @@ local/
 share/
 pip-selfcheck.json
 .pytest_cache/
+.mypy_cache/
 
 # ignore any key files
 *.key
diff --git a/dev-requirements.txt b/dev-requirements.txt
index d0359016..6b1c7d53 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -8,3 +8,9 @@ flake8
 flake8-import-order
 shtab
 versioningit >=1.1.1, <2
+
+mypy
+lxml-stubs
+types-freezegun
+types-requests
+types-urllib3
diff --git a/pyproject.toml b/pyproject.toml
index 697065d6..9901699c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,3 +46,12 @@ exclude_lines = [
   "raise NotImplementedError",
   "if __name__ == \"__main__\":",
 ]
+
+
+# https://mypy.readthedocs.io/en/stable/config_file.html
+[tool.mypy]
+python_version = 3.7
+show_error_codes = true
+show_error_context = true
+show_column_numbers = true
+warn_no_return = false
diff --git a/src/streamlink/py.typed b/src/streamlink/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/src/streamlink_cli/py.typed b/src/streamlink_cli/py.typed
new file mode 100644
index 00000000..e69de29b