Should getStaticPaths be preview mode aware?

[wbunting]

I could imagine being able to remove paths based on preview mode would be useful for build-time optimization.

Eg. working on notion-blog ijjk/notion-blog#22 it became clear that you would want to fallback in the case of an unpublished post so that time was not wasted on the production build generating pages for unpublished posts.

[Timer]

tl;dr getStaticPaths is never re-ran at runtime, including while in preview mode (so it cannot be aware).

By design, getStaticProps is meant to handle inputs not returned by getStaticPaths (this is one of the reasons getStaticPaths cannot pass data to getStaticProps).

As there's no fallback behavior in preview mode, running getStaticPaths is unnecessary (preview mode treats every path req as-if it were returned from getStaticPaths).