We're going to support a bunch of parsers that come along with heavy dependencies: babylon, flow, typescript, postcss, and maybe more in the future (graphql? html?)

We can't just use the npm dependency system otherwise it's going to take forever to install prettier and bloat your computer.

What we should do instead is to bundle each parser on its own file that we ship. This way we can have prettier be 0 dependencies and just ship a few files: bin, lib and one for each parser.