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Review Summary
I am requesting changes because the current implementation does not yet meet several core behavioral requirements of the task. First, when the source and destination paths are the same (see src/app.js, around your argument handling and equality check), the program should exit silently with no output, but it currently prints an error; update that branch to simply return without logging anything. Second, the task requires copying files only, while fs.cp can copy directories; you should switch to fs.copyFile or explicitly stat the source and ensure stats.isFile() before attempting the copy, failing with an error only when the source is not a regular file. Third, your callback calls console.error(error) unconditionally, which prints null on success; instead, guard with if (error) { console.error(...); process.exitCode = 1; } so there is no spurious output on success and failures signal a non-zero exit code. In addition, your argument parsing should ensure exactly two non-flag path arguments and reject anything that looks like an option (e.g. starting with -), so that no extra options or flags are allowed. Finally, make sure the Node 20+ requirement is documented in README or package.json (via engines) rather than enforced in code. Once you address these points, your solution will align much better with the specified checklist, and the overall structure you have will serve as a solid base.
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Footnotes
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| /* eslint-disable no-console */ | |||
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src/app.js
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| if (!source || !dest || source === dest) { | ||
| console.error('Error: parameters are invalid'); |
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The condition source === dest is treated as invalid and triggers an error message. The task requires doing nothing when source and destination are the same (checklist item #2). Instead of printing an error, exit silently (no console output) when they are equal.
src/app.js
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| if (!source || !dest || source === dest) { | ||
| console.error('Error: parameters are invalid'); | ||
| } else { | ||
| fs.cp(source, dest, (error) => { |
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fs.cp can copy directories as well as files. The task requires supporting only copying of files (checklist item #3). Validate the source with fs.stat and stats.isFile() before copying, or use fs.copyFile which is intended for file-to-file copying.
src/app.js
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| console.error('Error: parameters are invalid'); | ||
| } else { | ||
| fs.cp(source, dest, (error) => { | ||
| console.error(error); |
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You call console.error(error) unconditionally in the callback — this will print null on success. Only call console.error(...) when error is truthy and consider setting process.exitCode = 1 on failure to signal an error (satisfies checklist item #4 without spurious output).
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| const fs = require('fs'); | ||
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| const [source, dest] = process.argv.slice(2); |
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Argument parsing currently accepts any two values; the task forbids additional options/flags (checklist item #3). Consider rejecting arguments that look like options (e.g., start with -) and ensure exactly two non-flag path arguments are allowed.
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Review Summary
I am requesting changes because several core checklist requirements for the CLI behavior are not yet met, and they affect correctness and grading. First, argument validation in src/app.js must enforce exactly two non-flag path arguments: check process.argv.slice(2) has length 2, ensure neither argument starts with -, and on invalid input call console.error(...), set process.exitCode = 1, and return early. Second, in the branch that handles invalid parameters you currently only log an error; you also need to set a non-zero exit code (e.g. process.exitCode = 1) and stop further execution so the copy logic does not run after a failure. Third, before calling fs.copyFile, you must use fs.stat or fs.lstat on the source path and verify stats.isFile(); if it’s not a regular file, print a clear error with console.error, set process.exitCode = 1, and return. Fourth, any error callbacks (both from stat and copyFile) should use something like console.error('Error:', error.message || error); process.exitCode = 1; return; so failures consistently result in a non-zero exit status. Finally, remove the console.log('Success') so the program is completely silent on successful copies, as required; once these issues are addressed, your otherwise solid use of fs.copyFile and the existing same-path no-op behavior should fully satisfy the task.
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Important
Fix the issues, commit the changes, and then re-request my review using the Re-request review button2 in the Reviewers tab.
Tip
If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag3.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.
Caution
Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.
Footnotes
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| const fs = require('fs'); | ||
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| const [source, dest] = process.argv.slice(2); |
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Argument parsing currently destructures the first two args but does not enforce that exactly two arguments were provided nor reject extra arguments. The checklist requires exactly two non-flag path arguments. Check process.argv.slice(2).length === 2 and ensure none start with -, and call console.error(...) and set process.exitCode = 1 for invalid input.
| if (!source || !dest) { | ||
| console.error('Error: parameters are invalid'); |
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This branch logs an error when parameters are invalid but does not set a non-zero exit code or early-return. Per the checklist, failures must signal a non-zero exit (e.g. process.exitCode = 1) and you should return/exit after logging the error to avoid further execution.
| if (!source || !dest) { | ||
| console.error('Error: parameters are invalid'); | ||
| } else if (source !== dest) { | ||
| fs.copyFile(source, dest, (error) => { |
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Using fs.copyFile is appropriate for file copying, but you must explicitly ensure the source is a regular file (not a directory) before attempting the copy. Add a fs.stat/fs.lstat check and validate stats.isFile(), and reject non-files with console.error(...) and process.exitCode = 1.
src/app.js
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| if (error) { | ||
| console.error(error); | ||
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| return; |
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The error callback currently prints the raw error but does not set process.exitCode. Change to if (error) { console.error('Error:', error.message || error); process.exitCode = 1; return; } so errors use console.error and the process exits with a non-zero status on failure.
src/app.js
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| return; | ||
| } | ||
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| console.log('Success'); |
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The program logs console.log('Success') on successful copy. The task requires no output on success — remove this line so the app is silent when the copy succeeds.
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Review Summary
I am approving your solution as an educational override so you can keep progressing while you learn, but there are a few important fixes to make next.
You’ve done well implementing the core fs.copyFile behavior and correctly handling the "same source and destination" no-op case, and you also keep the CLI silent on success, which matches the requirements. The main issues are around CLI validation and exit behavior: in src/app.js, you currently destructure only the first two process.argv values but don’t check that process.argv.slice(2).length === 2 and that neither argument starts with - (you should reject flags and any extra/missing args per the checklist). When the arguments are invalid, your branch logs an error but does not set process.exitCode = 1 or return, which means the copy logic could still run after bad input; you should both set a non-zero exit code and return early in that case. Before calling fs.copyFile, you also need to run fs.stat or fs.lstat on the source path and verify stats.isFile(); if it’s not a regular file, print an error, set process.exitCode = 1, and return to respect the “files only” requirement. Finally, inside the fs.copyFile callback, make sure that whenever an error occurs you both log it (e.g., console.error('Error:', error.message || error)) and set process.exitCode = 1 so that scripts and CI can reliably detect failure.
Overall, your foundation is solid; tightening these argument checks, file-type validation, and exit-code behaviors will bring your CLI fully in line with the requirements and is a great next step in mastering Node.js CLI design.
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Footnotes
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| const fs = require('fs'); | ||
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| const [source, dest] = process.argv.slice(2); |
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You destructure the first two args but do not enforce that the user passed exactly two arguments (and no extras), nor do you check that neither argument starts with - (flags). Per the checklist you must verify process.argv.slice(2).length === 2 and that neither arg begins with - before proceeding.
| const [source, dest] = process.argv.slice(2); | ||
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| if (!source || !dest) { | ||
| console.error('Error: parameters are invalid'); |
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The invalid-parameters branch logs an error but does not set a non-zero exit code or return early. Update this to console.error(...), process.exitCode = 1, and return so the copy logic cannot run after invalid input (checklist requirement).
| if (!source || !dest) { | ||
| console.error('Error: parameters are invalid'); | ||
| } else if (source !== dest) { | ||
| fs.copyFile(source, dest, (error) => { |
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Before calling fs.copyFile you must fs.stat or fs.lstat the source and verify stats.isFile(). If the source is not a regular file, call console.error(...), set process.exitCode = 1, and return — the app only supports copying files.
| } else if (source !== dest) { | ||
| fs.copyFile(source, dest, (error) => { | ||
| if (error) { | ||
| console.error('Error:', error.message || error); |
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The fs.copyFile error callback logs the error but does not set a non-zero exit code. Change error handling to something like console.error('Error:', error.message || error); process.exitCode = 1; return; so failures consistently result in a non-zero exit status.
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