MPS 2.5 can be run as a plugin for IntelliJ IDEA enabling MPS-based DSLs to be used directly in a Java IDE, interoperating tightly with other elements of the project. Although you need MPS in its entirety to create languages, IntelliJ IDEA represents a convenient additional channel for DSL distribution.
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Enabling MPS inside a Java module is as simple as adding the MPS facet to it. Just like in MPS you can create models, import any MPS languages and start instantiating the root nodes. The root nodes are displayed in the Project View together with the other project sources and files. The projectional editor for the root nodes opens directly in IntelliJ IDEA so all your code stays within a single IDE.