Tags: Project-level tags failure crashes Storybook

[shilman]

Originally posted by @shilman in #27418 (comment)

@daneah I think you've found a bug. What's happening:

Storybook loads preview.js at runtime (in the browser)

This case should work for any valid JavaScript. So importing & re-exporting, functions that generate stuff, etc. are all "supported" (we don't actually support these things, but they won't break).

Storybook does static analysis on preview.js to determine sort order and project-level tags (in Node)

This case has all kinds of restrictions on what we can statically analyze. The old sort order code is probably wrapped with a try/catch and displays some kind of warning in the console that what you're doing is unsupported. The new tags code introduced in 8.1.0 is not wrapped.