manual-shrinkwrap.js

const _ = require('lodash')
const data = require('./wat.json')
const targets = [
  'drydock',
  'handlebars',
  'minimist',
  'node-uuid',
  'open',
  'prettyjson'
]

const mapReduce = (collection, map, reduce) => _.reduce(
  collection,
  (result, value, key) => {
    if (reduce(value, key)) {
      result[key] = map(value, key)
    }
    return result
  },
  Array.isArray(collection) ? [] : {}
)

const recursivePick = (value, key) => {
  if (typeof value === 'object') {
    const newValue = key === 'dependencies' ?
      value : // dependencies leaf
      _.pick(value, ['dependencies', 'version']) // single dependency leaf

    return _.mapValues(newValue, recursivePick)
  }

  return value
}

console.log(JSON.stringify(
  mapReduce(
    data.dependencies,
    recursivePick,
    (value, key) => ~targets.indexOf(key)
  ),
  undefined,
  2
))