Provide plugins list to rollup_bundle

[mattjs]

It would be great if we were able to provide plugins to rollup_bundle to perform processing tasks with babel or other libraries.

If I understand rollup_bundle.bzl correctly it might be possible to add a new attribute to rollup_bundle to pass a list of plugins to write_rollup_config

I looked into some related issues but wasn't able to find this exactly. Maybe there is some way to do this already?

Related issues:
#217
#211
#488

[mattjs]

Worked on a proof of concept by following the angular customization seen in ng_rollup_bundle

https://github.com/mattjs/react-bazel

I was able to get react with jsx bundled properly.

Missing from the rollup config was the ability to declare externals

external: [
  'react',
  'react-dom',
],

And other than that I just piped in plugins to TMPL_additional_plugins.

[kellycampbell]

Missing from the rollup config was the ability to declare externals

external: [
  'react',
  'react-dom',
],

I started going down this route of customizing the rollup rules for react, and then found that you can declare the externals via the globals attribtue. E.g.:

rollup_bundle(
    ...
    globals = {
        "react": "React",
        "react-dom": "ReactDOM",
    },
}

[alexeagle]

FYI, working on this now. See https://github.com/bazelbuild/rules_nodejs/pull/1072/files#diff-f378b9916f4e39bab74ea8151783ff88