Question: Finding ES6 Import statements

I used `babel-types`, `babel-generator`, `babylon` and `babel-traverse` to find ImportDeclarations within ES6 code.
But I need to preserve the formatting of the original file. So I came across `recast` and it looks like this might be a good library for my use case. But I can't figure out how to traverse for `ImportDeclaration`s. I looked into [defs/core.js](https://github.com/benjamn/ast-types/blob/master/def/core.js) and I couldn't find any `ImportDeclaration` specific definitions. Is this something babel specific?
SOme help would be really nice as I am quite new to AST manipulation and JS in general.

Start with defs/core.js and the ast-types traversal API, comparing them with the Babel tools and recast named in the issue. Done means documenting and verifying how to locate ImportDeclarations while preserving the original file formatting.

Written by the indexing model from the issue text.