Bundle Rollup defs into TypeScript definition before publishing

[developit]

The implementation here is super ridiculous, I know.

I tried all of the d.ts bundlers I could find, and none of them were able to handle ambient declarations within types to be bundled. Our types have them, but some of the types we depend on do as well (a connect middleware that is a dependency of Polka's types).

Originally I had built this to inline 100% of our type deps, but I don't think that approach can be made to function correctly. Instead, since we already scaffold projects with Automatic Type Acquisition, I've limited the inlining to only module-provided definitions (no @types/*) - effectively, only rollup.

Since it's just rollup, maybe a better solution here would be to have a build script inline Rollup's d.ts (which is already in node_modules and has no dependencies).

[changeset-bot]

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