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fs.promises.cp threw ERR_INVALID_ARG_TYPE when given Buffer paths, while fs.cpSync accepted them. The async helper at lib/internal/fs/cp/cp.js calls path.resolve/dirname/join on the raw input, and the path module rejects non-strings. The sync path lives in C++ and accepts Buffer transparently via BufferValue. Convert Buffer/Uint8Array paths to UTF-8 strings at the entry of cpFn so the async implementation matches the documented string | Buffer | URL contract and the sync behavior. URL paths are already pre-converted by getValidatedPath upstream and so are unaffected. Fixes: nodejs#58869 Signed-off-by: Maruthan G <maruthang4@gmail.com>
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fs.promises.cp threw ERR_INVALID_ARG_TYPE when given Buffer paths,
while fs.cpSync accepted them. The async helper at
lib/internal/fs/cp/cp.js calls path.resolve/dirname/join on the
raw input, and the path module rejects non-strings. The sync path
lives in C++ and accepts Buffer transparently via BufferValue.
Convert Buffer/Uint8Array paths to UTF-8 strings at the entry of
cpFn so the async implementation matches the documented
string | Buffer | URL contract and the sync behavior. URL paths
are already pre-converted by getValidatedPath upstream and so are
unaffected.
Fixes: #58869
Note: I was unable to run the project's test suite locally on this Windows host (no built
out/Release/node). The changed files lint clean and passnode --check. Relying on CI for full verification — happy to iterate on any failures.