Hatch uses openapi-generator to generate a client from your OpenAPI v3 spec. openapi-generator has many "generators" to allow users to generate different types of clients; the one used by Hatch is thetypescript-axios generator. Hatch currently does not allow changing the type of generator used...
Generate strongly typed C# and TypeScript client codes from Open API / Swagger definitions supporting jQuery, Angular, AXIOS, Fetch API, Aurelia and Angular Strictly Typed Forms - zijianhuang/openapiclientgen