Review Summary

Your solution is approved because it implements all the core functional requirements correctly. The program copies a file from a source path to a destination path using fs.copyFileSync, skips the operation when the resolved source and destination paths are the same, and limits behavior to plain file copying with no extra flags, satisfying [CHECKLIST ITEM #1–#3]. You also correctly use console.error to report invalid inputs (such as missing arguments) and to prevent copying when either path is a directory, aligning with the requirement to handle errors via stderr [CHECKLIST ITEM #4].

There are no critical blockers: the main functionality works as intended and covers the expected scenarios. As a minor robustness improvement (not required for this task), you could wrap the copyFileSync call in a try/catch to handle unexpected filesystem errors (e.g., permission issues) and log them via console.error. Overall, this is a solid implementation that meets the task and checklist requirements—well done.

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