This's a UB in Rollup. There's no way to only create a bundle in rollup without triggering the buildStart hook. For API like rollup(..)/watch(..), build stage hooks will surely be executed.

So for rollup, the quesion that "should we trigger closeBundle hook if there's no build/bundle happens" doesn't exist in the rollup world.

Notice: Bundler, unlike ClassicBundler, is designed for watch/dev mode.

I thought about making close bundle a bundler level hook, but it requires some significant change. Like this.resolve will be forbidden with closeBundle, though nobody use it this way.

Originally posted by @hyf0 in #6891 (comment)

Actually this also brings up question about how we gonna handle this in ClassicBundler?

"should we trigger closeBundle hook if there's no build/bundle happens"

Currently if you write

(await rolldown(..)).close()

closeBundle won't triggered in rolldown, while rollup will.

rolldown/crates/rolldown_binding/src/classic_bundler.rs

Line 72 in 068cfaa

last_bundle_context: Option<BundleContext>,

Originally posted by @hyf0 in #6891 (comment)

We need to decide what to do for the first one and also document it (and fix the implementation if needed).