Cross-platform third-party stubs requirements install script (#13482)

lib/ts_utils/requirements.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import itertools
+import os
+import sys
+from collections.abc import Iterable
+
+from packaging.requirements import Requirement
+
+from ts_utils.metadata import read_dependencies, read_stubtest_settings
+from ts_utils.paths import STUBS_PATH
+
+
+def get_external_stub_requirements(distributions: Iterable[str] = ()) -> set[Requirement]:
+    if not distributions:
+        distributions = os.listdir(STUBS_PATH)
+
+    return set(itertools.chain.from_iterable([read_dependencies(distribution).external_pkgs for distribution in distributions]))
+
+
+def get_stubtest_system_requirements(distributions: Iterable[str] = (), platform: str = sys.platform) -> list[str]:
+    if not distributions:
+        distributions = os.listdir(STUBS_PATH)
+
+    requirements: list[str] = []
+    for distribution in distributions:
+        requirements.extend(read_stubtest_settings(distribution).system_requirements_for_platform(platform))
+    return requirements