IntelliJ plugin - supported project types

I'm developing some web languages (HTML/CSS/JS) and it would be nice to be able to use them in, say, a node.js project in IntelliJ Ultimate.  But I couldn't get this to work at all - it let me add the MPS facet and create a model, and even populate the model, but I couldn't find any way to generate the code from the model.

Does the IntelliJ MPS plugin only work for Java projects?  It appears that the code generation is hooked in with the builder in IntelliJ - are there some manual steps I need to follow to enable it in a non-Java project, or is it just not supported at all?

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