[BUG][typescript-axios] TypeError: openapi_1.*Api is not a constructor

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I'm using the typescript-axios generator. The creation of the client is not difficult, however there is 0 documentation about the usage.
How should it be initialised? It would be really nice to add examples about the meanings of the API exports:
ResourceApi, ..ApiFn, ApiFactory: What are the differences?

const client = new WikidataApi();
               ^
TypeError: openapi_1.WikidataApi is not a constructor

However I'm getting this error when initializing the class.

openapi-generator version

"@openapitools/openapi-generator-cli": "^2.5.1"

OpenAPI declaration file content or url

https://entitree-openapi.vercel.app/api/openapi.json

Generation Details

openapi-generator-cli generate -i src/openapi.json -g typescript-axios -o src/openapi

Steps to reproduce

import { WikidataApi } from "./openapi";

const client = new WikidataApi();
const ret = client.getAirlineByIATACodeGet("FRA");

Related issues/PRs

Suggest a fix

Start by generating the client with the documented command from the OpenAPI declaration at https://entitree-openapi.vercel.app/api/openapi.json, then inspect the generated src/openapi entry point and its exported ResourceApi, ApiFn, ApiFactory, and WikidataApi symbols. Reproduce the import and instantiation shown in the issue; done means the generated client can be initialized as documented or the supported export usage is clearly documented.