refactor: Make importlib-resources a dev dependency and remove the `S…

…CHEMA_FILE` constant from the public API (#36)

<!-- readthedocs-preview pep610 start -->
----
📚 Documentation preview 📚:
https://pep610--36.org.readthedocs.build/en/36/

<!-- readthedocs-preview pep610 end -->

pyproject.toml

@@ -34,12 +34,12 @@ dynamic = [
   "version",
 ]
 dependencies = [
-  'importlib-resources>=5.3; python_version < "3.9"',
 ]
 optional-dependencies.dev = [
   "coverage[toml]>=6.5",
   "hypothesis",
   "hypothesis-jsonschema",
+  'importlib-resources>=5.3; python_version < "3.9"',
   "pytest",
 ]
 optional-dependencies.docs = [

src/pep610/__init__.py

@@ -4,18 +4,13 @@
 
 import hashlib
 import json
-import sys
 import typing as t
 from dataclasses import dataclass
 from functools import singledispatch
 from importlib.metadata import version
 
-if sys.version_info < (3, 9):
-    import importlib_resources
-else:
-    import importlib.resources as importlib_resources
-
 if t.TYPE_CHECKING:
+    import sys
     from importlib.metadata import Distribution, PathDistribution
 
     if sys.version_info <= (3, 10):
@@ -46,7 +41,6 @@
     "write_to_distribution",
 ]
 
-SCHEMA_FILE = importlib_resources.files(__package__) / "direct_url.schema.json"
 __version__ = version(__package__)
 
 

tests/test_generic.py

@@ -1,12 +1,19 @@
 import json
+import sys
 from importlib.metadata import Distribution
 
 import pytest
 from hypothesis import HealthCheck, given, settings
 from hypothesis_jsonschema import from_schema
 
-from pep610 import SCHEMA_FILE, read_from_distribution, write_to_distribution
+from pep610 import read_from_distribution, write_to_distribution
 
+if sys.version_info < (3, 9):
+    import importlib_resources
+else:
+    import importlib.resources as importlib_resources
+
+SCHEMA_FILE = importlib_resources.files(__package__) / "fixtures/direct_url.schema.json"
 SCHEMA = json.loads(SCHEMA_FILE.read_text())