[BUG] typescript-axios doesn't export models when withSeparateModelsAndApi flag is true

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• [N/A] Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
  5.0.0-SNAPSHOT
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I'm using the typescript-axios generator with the withSeparateModelsAndApi flag:

withSeparateModelsAndApi: true
apiPackage: 'api'
modelPackage: 'model'

Basically, when using this, the models aren't exported from the root package:

// index.d.ts
export * from "./api";
export * from "./configuration";

However both the API classes and models are correctly included with the default setup which uses a single file for everything. It would be desirable to export the models in all cases. The separate-file structure is much nicer for editors that are slow processing large files.

openapi-generator version

5.0.0-SNAPSHOT

OpenAPI declaration file content or url

See above

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix

Just export the modelPackage directory as well, don't think it's super complicated.

ETA: Apologies for not editing the description when I first posted this.

ETA Again: withSeparateModelsAndApi: true - I accidentally included false before because that was the config I was debugging with. Sorry for being sloppy today!

Start with the typescript-axios generator and inspect how it creates index.d.ts when withSeparateModelsAndApi is true, using the apiPackage and modelPackage settings shown. Done means the generated root package exports both the API classes and the models; verify the generated output against the single-file setup.