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Don't create .mypy_cache directory when --no-incremental is used #20833

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Don't create .mypy_cache directory when --no-incremental is used #20833

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4 changes: 4 additions & 0 deletions mypy/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1551,6 +1551,10 @@ def exclude_from_backups(target_dir: str) -> None:

def create_metastore(options: Options, parallel_worker: bool = False) -> MetadataStore:
"""Create the appropriate metadata store."""
if not options.incremental:
# When incremental mode is disabled, use a no-op store to avoid
# creating a .mypy_cache directory.
return FilesystemMetadataStore(os.devnull)
if options.sqlite_cache:
# We use this flag in both coordinator and workers to seep up commits,
# see mypy.metastore.connect_db() for details.
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