It looks that the samples are copied from C#? For Rest Level Client (RLC) we don't have constructors to create client instances. We use the factory/builder method instead. Looks that the package has correct samples, but the example snippets are untested and wrong. For example,

Sample snippets in README.md should be valid and are expected to work with minimal effort after copying and pasting them into a project.

To get the benefits of build and run samples, please refer to template package for how we could use a snippets.spec.ts and the dev-tool's update-snippets command