can't be used as a esformatter plugin since transform_node is undefined

[millermedeiros]

/Users/millermedeiros/Projects/opensource/rocambole-commafirst/lib/index.js:10
  rocambole.moonwalk(ast, transform_node)
                          ^
ReferenceError: transform_node is not defined

would also be cool to add some documentation on how to install the plugin and use it:

Use it as an esformatter plugin

install it:

npm install rocambole-commafirst

and add to your esformatter config file:

{
  "plugins": [
    "rocambole-commafirst"
  ]
}

PS: would be good to add esformatter to the package.json keywords.

[millermedeiros]

to test it locally:

npm link

add the esformatter config to package.json:

{
  "esformatter": {
    "root": true,
    "plugins": ["rocambole-commafirst"]
  }
}

and run

esformatter test/funky-object.js