Smithy4s provides a module for creating CLIs with Decline. Smithy4s cross-compiles many of its modules to Scala Native, including this one. This means we can create CLIs that work with Scala Native to avoid the JVM boot up time when invoking the CLI. We could similarly use Scala.js, or

Smithy4s is a library that provides tooling for the Smithy IDL in Scala. One of the things Smithy4s does is allow you to easily create a REST service based on a Smithy specification. In general, it will eliminate your need for maintaining the API layer of your service altogether. Smithy4s