How to bundle external types into own package?

[moltar]

Let's say I want to re-package and re-publish some types from an external npm package, but not have it be in the dependencies.

The solution on the TS code side is quite easy:

// ./index.ts

export type { Config as RenovateConfig } from 'renovate'

But how do I configure tsup to bundle the types, rather than import them in the final built asset?

In effect, this is like bundling all third-party code. I know esbuild is capable of that. Just not sure how to do it in tsup.

More details:

The use case is that I want to create a helper package for a third-party package, but do not want to have to force the user to install the actual third-party package, because it's very heavy (10 MB). I am talking about renovate, which is in effect a whole application. I am working on a tool that helps manage Renovate configuration, which can be shared, but it does not need the entire renovate baggage. Most users will use the Renovate Bot GitHub Action anyway and just need a single .json file in the end.

[OmGuptaIND]

any updates on this @moltar. Trying to do the same thing

[moltar]

@OmGuptaIND This config will do it.

  "dts": {
    "resolve": true
  },

You also want the package to be a devDep installed, otherwise tsup will ignore it, and not bundle it.

But ... I did run into a bug somewhere in the chain, where this may not work for all cases. I have a repro case: https://github.com/moltar/tsup-dts-resolve