WIP: demo of using rollup code splitting prototype rule

[gregmagolan]

No description provided.

[kylecordes]

If I understand right from the bazel rule in here, it is hardcoded to know about the entry point for the lazy loaded foo module. I recently also used rollup to create a working set of lazy bundles, with that same manual gathering of the entry points. I'm really looking forward to seeing something to gather them automatically - from some chat discussion it sounds like the "official" way to do this could take a few months to come through.

[gregmagolan]

@kylecordes Yes. This is an early prototype for this and the entry points are hard-coded in the rule and in index.html.

[alexeagle]

Igor and I have been working here:
angular/angular#21431

in an earlier snapshot, there was an ng_entry_point rule that you could put in another package - but it only provided string data so it was simpler to just list them in the bundle.

Longer-term we should get them from a static analysis output from individual libraries.

[alexeagle]

looks like this script could easily be another output of the rollup_bundle rule, placed in the runfiles.transitive_files so it's available to be loaded by anything with a transitive data[] dep

[alexeagle]

Seems like some files are not git add'ed? Where's the change in rollup_bundle.bzl?

[kylecordes]

@gregmagolan @alexeagle Thanks - I will keep an eye on that PR and any successors, and try to provide a bit of testing-with-code-out-here-in-the-wild where feasible.

[gregmagolan]

Seems like some files are not git add'ed? Where's the change in rollup_bundle.bzl?

@alexeagle You mean the one in here? https://github.com/bazelbuild/rules_nodejs/pull/104/files :)

[alexeagle]

Closing this PR since we don't plan to merge right now, the primary copy of this code is in Greg's fork