Throw error on invalid code

[John]

Hello! In the documentation, I did not find how to throw an error if the code is not valid.

Example, there is no ampersand near the button tag:

.wrapper {
  button {
    display: flex;
  }
}

But package still build invalid code :(
How about implementing this functionality?

[Jonathan Neal]

This plugin won’t throw on that code, and will instead ignore it. This is because some authors may include other plugins that accept the syntax. If linting is desired, use a stylelint plugin.