Peter/rollup exports

[peterphanouvong]

Explain your changes

• new middleware submodule
• exports for the submodules work better + also come with types

Suppose there is a related issue with enough detail for a reviewer to understand your changes fully. In that case, you can omit an explanation and instead include either “Fixes #XX” or “Updates #XX” where “XX” is the issue number.

Checklist

• I have read the “Pull requests” section in the contributing guidelines.
• I agree to the terms within the code of conduct.

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