Based on this issue, it seems the typescrypt generator is going to be a more maintainable replacement than the generators you proposed. While it is currently flagged as 'experimental', I believe it will become a more solid option in the near future.

What I do is, I have openapi-templates folder in the root of my project.

Then you have to find the template you want to override on openapi-generator github.

I'm not sure what exactly you're using, so this bit might be slightly different for you but.. I'm using the docker version of openapi-generator-cli and I'm mounting my physical folder (the one where I put the openapi-templates folder), as :/local in docker. And then I use the -t /local/openapi-templates command line switch to tell the generator to look into my openapi-templates folder for any template overrides which it should apply over the default ones.

Next, you should download the modelGeneric.mustache file from that github link. Put the file inside the openapi-templates folder, and modify it. Basically you need to change the interface keyword to class keyword.

Now run your generator with that extra command line param and you should be have generated classes instead of interfaces, and since in TS classes can act as interfaces, there are no real drawbacks.

Just keep in mind that openapi team updates these templates every once in a while, so now you might have to maintain your custom overridden files.. Perhaps check every 6 months if a new default template is out there and apply your customizations to it.

Have a look at the types for Axios, specifically AxiosResponse: https://github.com/axios/axios/blob/master/index.d.ts#L70

You'll see that it accepts a generic, in your case Theme, which will be accessible under the data property. So you'll need to get your value out using something like the following:

private async getThemes() {
  const response = await this.themesApi.getThemes();
  this.themes = response.data;
}

Got solved it by modifying template:

• download baseApi.mustache file from openapi-templates

• put it somewhere in your project, for example in .openapi-generator/templates

• modify import globalaxios to your axiosinstance:

  import { axiosClient as globalAxios } from '../../api';

• generate new code with cli:

    rm -rf src/generated/openapi; openapi-generator-cli generate -t .openapi-generator/templates -c openapi-generator-config.yaml
  

(My openapi-generator-config.yaml)

generatorName: typescript-axios
outputDir: src/generated/openapi
cleanupOutput: true
inputSpec: ../app/backend/target/openapi.yaml
additionalProperties:
  supportsES6: true