Sometimes we need to transform the ast to make it easier to print, but it's currently done in the parser (markdown and yaml), which leads the output ast harder to use for external users (custom parser), adding `printer.preprocess` can solve this issue.
And also this way we could move the trailing newline for json from `ast-to-doc.js` to `language-js`.
* Split out location extraction into plugin config
* Reduce set of exported function, rebase to current master
* Pass custom locStart/locEnd fn's directly to affected methods
* (wip) always use locStart/locEnd from plugin
* Convert graphql implementation
* Convert HTML implementation
* (wip) convert JS implementation
* Remove unused variables
* Continue conversion of JS implementation
* Replace "util.locStart" with direct call to "options.locStart"
* Remove util closure
* Add unit test for structure of shared util
* Fix linting error, simplify locStart/End implementations
* Split up comment printing
* Refactor plugin handling
* Allow multiparser to use options normalization
* Rename to canAttachComment
* Add inline comment
* Format code
* Use prettier.__debug to get AST
Julian Rosse