They depend on core packages like caching-compiler, but coffeescript-compiler
can remain in non-core, so it can update more frequently as npm coffeescript
gets updated.
* Update CoffeeScript to 1.11.0, which supports modules; update check for whether to pass CoffeeScript’s output to Babel to look not just for backticks, but also for `import`, `export` and `function*`, the current ESNext features output by CoffeeScript
* Add tests for imported modules using CoffeeScript’s new native import statement
* Test that CoffeeScript native export statements work, by importing something exported by such a statement
* Improve regex
* Optimize regex