how to not export the parameters or models only for private method in HLC

[qiaozha]

Currently we are using shared parameters.ts file and models.ts file for those parameter or models used by operations, and we have to export the types or models used by private method so that they can be referred by these method, which makes those types or models exported to public as well. but for private method, their parameters and models should not be exported. We should figure out a way to make those types or models private.