What are other's thoughts, opinions and experiences going from CSP to RESTful services, specifically when it comes to reusing code in CSP files?

One could define a method in CSP as follows:

<script language="cache" method="SubmitSomethingAwesome" arguments="aswesomeId:%Numeric"> 

And it's generated in csp.mycsppage.cls ascsp.mycsppage.SubmitSomethingAwesome(awesomeId as %Numeric).

Have people had success defining there rest call by calling the generated CSP classmethod?

Things that work well I've found:

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After some trials, I am comfortably on my way developing spec first REST APIs using /api/mgmt/, OpenAPI 2.0, testing with Postman.

My question is related to scaling up.

Assume these things:

- Our software is CSP web app and it's web application is '/csp/application'

- I created a new REST enabled web app called '/csp/application/v1' and for my first API I created a spec that defines an endpoint /getTeapots so the endpoint is localhost/csp/application/v1/getTeapots

- Using the /api/mgmt/ endpoint, I loaded the spec into API.TeapotLibrary

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I have successfully created REST service classes on my local IRIS server following this book: Using the /api/mgmnt/ Service | Creating REST Services | InterSystems IRIS Data Platform 2021.2

I am now 1) trying to edit impl.cls in VS Code and 2) export it to my local repo so I can push to the remote repo.

When I click on my project in VS Code and 'Add to project' and choose the new package, spec.cls and impl.cls, I get the following error:

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