This looks like a good step, thank you. I am seeing the same error locally you can see in CI:

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib' is not defined by "exports" in /home/runner/work/feathers/feathers/packages/transport-commons/node_modules/@feathersjs/errors/package.json

I'm not sure what that means since all those packages have an identical configuration.

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@daffl, @FossPrime

I don't know what the error in the generator is about:

Builds are passing. I think we could try it out.

I don't know what the best strategy is though. Install from github is not possible because of lerna workspace packages, right? Maybe we need pre-versions.

Making a note here that the thing that may be missing is that the ESM and CJS folders each need a package.json that declares the module type like

{ "type": "module|commonjs" }

Now that TypeScript seems to support it properly it might also make sense to use full imports with .js extensions.