Fix showing files added since the last release

[bunysae]

Add support for unpublished as well as first time published files as mention in #588 (comment).

[sindresorhus]

Tests are failing.

[sindresorhus]

I created a file foo, added it to files in package.json, committed, ran np, but did not get a warning about a new file being added to the package.

[bunysae]

@sindresorhus
this issue may have several causes:

• it's a private package
• publishing step is skipped (np --no-publish)
• file foo wasn't added to git properly
• foo is the main-file in package.json

When these bullet points were all negative, the prompt shows file foo in my tests.
In source/ui.js we just show the prompt when publishing step is invoked:

if (options.runPublish) {
                checkIgnoreStrategy(pkg);

                const answerIgnoredFiles = await checkNewFiles(pkg);
...

[sindresorhus]

I cannot reproduce anymore, so you're probably right that it had either of those conditions.

[jessieay]

I think this message is inaccurate? Maybe it should read:

The following new files are not already part of your published package

instead?

[cybairfly]

@jessieay I agree! This is a very confusing message! Happens on files which have no apparent reason not to be included!

[cybairfly]

Ok great seems to be fixed in new version. Thanks!