I don’t think you have read the current Version. Hereby the first two paragraphs:
“ Rome is an experimental JavaScript toolchain. It includes a compiler, linter, formatter, bundler, testing framework and more. It aims to be a comprehensive tool for anything related to the processing of JavaScript source code.
Rome is not a collection of existing tools. All components are custom and use no third-party dependencies.”
Compiler here probably means transpiler. Like Babel. Supporting new ECMAScript stuff, transpiling it to ES3/ES5 or whatever, so you can use it in IE6, or on NodeJS 8.
'Transpiler' adds useful extra information and context though. It's like it's fine to just say 'animal' but it's a bit more useful with more information to say 'cow'.
“ Rome is an experimental JavaScript toolchain. It includes a compiler, linter, formatter, bundler, testing framework and more. It aims to be a comprehensive tool for anything related to the processing of JavaScript source code.
Rome is not a collection of existing tools. All components are custom and use no third-party dependencies.”