Vuepress should fail if imported code snippets is not found

[nfnt]

Feature request

What problem does this feature solve?

Currently, when trying to import a code snippet from a non-existing file, vuepress will create a snippet that says "File not found".
Input:

<<< @/file_does_not_exist.js

Output:

Not found: /app/file_does_not_exist.js

This is a problem because it results in broken documentation. In a CI/CD environment it would be great to surface this problem early.

What does the proposed API look like?

Vuepress should fail to render if a code snippet isn't found.

How should this be implemented in your opinion?

Are you willing to work on this yourself?

[ivandevp]

Can I work on this?

[kefranabg]

@ivandevp sure !

[ivandevp]

Hey guys! I've created a PR with the changes I'm making for this issue (#1910). I want your suggestions on this. By this moment, I've added the logger to show an error in the building process but, it won't stop the process. I haven't found a way to throw an error in other plugins used in the codebase, so I would like to know if you have an idea of how it should be. Let me know your thoughts, please.

[kefranabg]

Hi @ivandevp, let's discuss this in your PR 😉