In the previous article, I wrote about project name validation. In this article, let’s look at more code from index.ts

if (program.example === true) {
    console.error(
      'Please provide an example name or url, otherwise remove the example option.'
    )
    process.exit(1)
  }

program.example reminds of accessing options passed in via the cli

example is an option as shown below:

// https://www.npmjs.com/package/commander#options
// -e
// https://github.com/vercel/next.js/tree/canary/packages/create-next-app#non-interactive
.option(
  '-e, --example [name]|[github-url]',
  `
    An example to bootstrap the app with. You can use an example name
    from the official Next.js repo or a GitHub URL. The URL can use
    any branch and/or subdirectory
  `
)

Pass it as npx create-my-app -e, because it needs url when there is no url provided, the following error is thrown

Conclusion:

As I look at the more lines of code, I see that there is safeguarding in place for options submitted, for example, for project name and now for example.

Take the user input and importantly validate it before proceeding further.

If you have any questions, feel free to reach out to me at ramu.narasinga@gmail.com

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Hey, my name is Ramu Narasinga. I study large open-source projects and create content about their codebase architecture and best practices, sharing it through articles, videos.

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