What problem does this feature solve?

esm-env is a popular package in the svelte ecosystem (code search), which exposes constants depending on the environment (e.g. browser) using exports field.

The ecosystem relied on the cross chunk dead code elimination to generate a smaller output.

bundler exporer

refs oxc-project/oxc#10843 (this issue is a more advanced version of that one)

What does the proposed API look like?

Not an API change.