Externalize UI components from storybook build

[pavlovp]

Hi,
I'm developing a large scale monorepo and I'm planning to use Storybook composition

For simplification, let's assume I have 2 packages A and B, both of which contain React components. Both packages contain storybook stories.
Each package can be built using Storybook resulting in 2 separate Storybook builds. I am planning to have separate Storybook which would compose the stories from A and B using the method describe in Storybook docs.

Additionally, package A depends on B - this means that stories from A can use also components from package B.

The problem: If there is a change in package B, I need to rebuild both Storybooks.
Storybook output bundles contain the code for presented UI components. Storybook build for A contains the compiled React components both for A and B - this is why rebuild for both packages would be required.
On each PR I am rebuilding changed packages, each of them is built into different formats - it would be great if I could make reuse of these bundles in runtime.

Is there recommended configuration to externalize user defined code from the storybook output bundles?
I am also open to introduce build configuration for my packages that would allow to build them in format consumable by Storybook in runtime.