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Review Summary
Excellent work on this file copying tool! Your solution correctly handles all the specified requirements, including argument parsing, file existence checks, and the case where source and destination are the same. I am happy to approve this submission.
As a key point for improvement, I recommend adopting the standard convention for exit codes in command-line applications. When an error occurs, it's best practice to exit with a non-zero status code, such as process.exit(1). This correctly signals failure to automated scripts and other tools, whereas an exit code of 0 implies success. Applying this will make your command-line tools more robust and reliable.
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Footnotes
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| if (!source || !destination) { | ||
| console.error('Wrong arguments'); | ||
| process.exit(0); |
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It's a standard convention for command-line tools to exit with a non-zero status code when an error occurs. An exit code of 0 indicates success. Consider using process.exit(1) here to signal that the program terminated due to an error.
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| if (!fs.existsSync(source)) { | ||
| console.error(`Source file '${source}' does not exist`); | ||
| process.exit(0); |
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Similar to the previous error check, it's better to exit with a non-zero status code like 1 to indicate that an error occurred.
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| if (sourceStats.isDirectory()) { | ||
| console.error(`Source '${source}' is a directory, not a file`); | ||
| process.exit(0); |
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To maintain consistency with command-line standards, this error condition should also result in a non-zero exit code, such as 1.
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| if (destStats.isDirectory()) { | ||
| console.error(`Destination '${destination}' is a directory, not a file`); | ||
| process.exit(0); |
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This is another case where the program should exit with a non-zero status code to properly indicate that an error has occurred.
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