Add 'strandedness' to permitted meta keys

CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Linting
 
 - Warn if `manifest.diagram` is not set, and fail if it is not a relative path to an existing image file ([#4460](https://github.com/nf-core/tools/pull/4460))
+- Add strandeness to permitted meta keys ([#4473](https://github.com/nf-core/tools/pull/4473))
 
 ### Modules
 

nf_core/modules/lint/main_nf.py

@@ -390,7 +390,7 @@ def check_script_section(self, lines):
             )
 
     # Validate meta keys
-    permitted_meta_keys = {"id", "single_end"}
+    permitted_meta_keys = {"id", "single_end", "strandedness"}
     invalid_meta_keys = [
         f"{prefix}{key}"
         for prefix, key in re.findall(r"(?<!\.)\b(meta\d*\??\.)(\w+)\b(?!\()", script)

tests/modules/lint/test_main_nf.py

@@ -1180,6 +1180,7 @@ def test_validate_meta_keys():
             """
     def prefix = "${meta.id}"
     def se = meta.single_end
+    def strand = meta.strandedness
     def id = meta.subMap(['id'])
     def m2id = meta2?.id
     """
@@ -1194,14 +1195,14 @@ def m2id = meta2?.id
         [
             """
     def sample = meta.sample
-    def strand = meta.strandedness
+    def region = meta.region
     def m2opts = meta2?.options
     """
         ],
     )
     assert len(mock_lint.failed) == 1
     assert "meta.sample" in mock_lint.failed[0][2]
-    assert "meta.strandedness" in mock_lint.failed[0][2]
+    assert "meta.region" in mock_lint.failed[0][2]
     assert "meta2?.options" in mock_lint.failed[0][2]
 
     # meta2/meta3 with valid keys