When using opencli-generator-cli manually, I'm able to pass a flag to specify a folder that contains template overrides. I'd love to have this available in this tool.

In my case, I'm using typescript-angular and the default api.service.mustache template adds a lot of bloat I don't want. I copied the .mustache file from https://github.com/OpenAPITools/openapi-generator/tree/master/modules/openapi-generator/src/main/resources/typescript-angular, modified it to my liking, then added it to a folder in my project named custom. This allows me to run: openapi-generator generate -i spec.yaml -g typescript-angular -t ./custom/ -o ./output/

The tool is smart enough to use custom templates if available, and use the default generator's templates otherwise.

https://openapi-generator.tech/docs/templating#modifying-templates

I'm happy to build this feature if you find it useful. :)