Spacebars Compiler
The Spacebars compiler that is invoked at build time to compile templates to JavaScript.
While this code is not normally ever shipped to the client, it can be used at runtime on the server or the client by using the SpacebarsCompiler symbol from this package.
The spacebars package, in contrast, contains the Spacebars symbol and the Spacebars runtime, which is shipped to the client as part of the app.
Read more about Spacebars, Blaze, and Templating on the Blaze.