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?? access.js(5.54 KB)
?? adduser.js(1.31 KB)
?? audit.js(10.56 KB)
?? auth
?? bin.js(515 B)
?? bugs.js(864 B)
?? build.js(4.44 KB)
?? cache.js(4.66 KB)
?? ci.js(1.31 KB)
?? completion.js(7.11 KB)
?? config
?? config.js(7.43 KB)
?? dedupe.js(4.88 KB)
?? deprecate.js(2.11 KB)
?? dist-tag.js(4.11 KB)
?? docs.js(1.04 KB)
?? doctor
?? doctor.js(3.98 KB)
?? edit.js(1.37 KB)
?? explore.js(1.67 KB)
?? fetch-package-metadata.js(3.97 KB)
?? fetch-package-metadata.md(1.77 KB)
?? fund.js(4.91 KB)
?? get.js(235 B)
?? help-search.js(5.64 KB)
?? help.js(6.35 KB)
?? hook.js(4.62 KB)
?? init.js(2.74 KB)
?? install
?? install-ci-test.js(486 B)
?? install-test.js(507 B)
?? install.js(36.47 KB)
?? link.js(5.6 KB)
?? logout.js(1.26 KB)
?? ls.js(16.09 KB)
?? npm.js(14.37 KB)
?? org.js(4.18 KB)
?? outdated.js(12.28 KB)
?? owner.js(6.6 KB)
?? pack.js(11.79 KB)
?? ping.js(1.11 KB)
?? prefix.js(330 B)
?? profile.js(11.13 KB)
?? prune.js(2.23 KB)
?? publish.js(5.14 KB)
?? rebuild.js(2.09 KB)
?? repo.js(1.44 KB)
?? restart.js(64 B)
?? root.js(320 B)
?? run-script.js(5.41 KB)
?? search
?? search.js(3.36 KB)
?? set.js(276 B)
?? shrinkwrap.js(9.82 KB)
?? star.js(2.11 KB)
?? stars.js(1.03 KB)
?? start.js(62 B)
?? stop.js(61 B)
?? substack.js(509 B)
?? team.js(4.61 KB)
?? test.js(374 B)
?? token.js(6.66 KB)
?? unbuild.js(4.27 KB)
?? uninstall.js(2.21 KB)
?? unpublish.js(3.51 KB)
?? update.js(2.16 KB)
?? utils
?? version.js(9.79 KB)
?? view.js(15.11 KB)
?? visnup.js(4.01 KB)
?? whoami.js(1.77 KB)
?? xmas.js(1.62 KB)

Editing: dedupe.js

var util = require('util')
var path = require('path')
var validate = require('aproba')
var without = require('lodash.without')
var asyncMap = require('slide').asyncMap
var chain = require('slide').chain
var npa = require('npm-package-arg')
var log = require('npmlog')
var npm = require('./npm.js')
var Installer = require('./install.js').Installer
var findRequirement = require('./install/deps.js').findRequirement
var earliestInstallable = require('./install/deps.js').earliestInstallable
var checkPermissions = require('./install/check-permissions.js')
var decomposeActions = require('./install/decompose-actions.js')
var loadExtraneous = require('./install/deps.js').loadExtraneous
var computeMetadata = require('./install/deps.js').computeMetadata
var sortActions = require('./install/diff-trees.js').sortActions
var moduleName = require('./utils/module-name.js')
var packageId = require('./utils/package-id.js')
var childPath = require('./utils/child-path.js')
var usage = require('./utils/usage')
var getRequested = require('./install/get-requested.js')

module.exports = dedupe
module.exports.Deduper = Deduper

dedupe.usage = usage(
  'dedupe',
  'npm dedupe'
)

function dedupe (args, cb) {
  validate('AF', arguments)
  // the /path/to/node_modules/..
  var where = path.resolve(npm.dir, '..')
  var dryrun = false
  if (npm.command.match(/^find/)) dryrun = true
  if (npm.config.get('dry-run')) dryrun = true
  if (dryrun && !npm.config.get('json')) npm.config.set('parseable', true)

new Deduper(where, dryrun).run(cb)
}

function Deduper (where, dryrun) {
  validate('SB', arguments)
  Installer.call(this, where, dryrun, [])
  this.noPackageJsonOk = true
  this.topLevelLifecycles = false
}
util.inherits(Deduper, Installer)

Deduper.prototype.loadIdealTree = function (cb) {
  validate('F', arguments)
  log.silly('install', 'loadIdealTree')

var self = this
  chain([
    [this.newTracker(this.progress.loadIdealTree, 'cloneCurrentTree')],
    [this, this.cloneCurrentTreeToIdealTree],
    [this, this.finishTracker, 'cloneCurrentTree'],

[this.newTracker(this.progress.loadIdealTree, 'loadAllDepsIntoIdealTree', 10)],
    [ function (next) {
      loadExtraneous(self.idealTree, self.progress.loadAllDepsIntoIdealTree, next)
    } ],
    [this, this.finishTracker, 'loadAllDepsIntoIdealTree'],

[this, andComputeMetadata(this.idealTree)]
  ], cb)
}

function andComputeMetadata (tree) {
  return function (next) {
    next(null, computeMetadata(tree))
  }
}

Deduper.prototype.generateActionsToTake = function (cb) {
  validate('F', arguments)
  log.silly('dedupe', 'generateActionsToTake')
  chain([
    [this.newTracker(log, 'hoist', 1)],
    [hoistChildren, this.idealTree, this.differences],
    [this, this.finishTracker, 'hoist'],
    [this.newTracker(log, 'sort-actions', 1)],
    [this, function (next) {
      this.differences = sortActions(this.differences)
      next()
    }],
    [this, this.finishTracker, 'sort-actions'],
    [checkPermissions, this.differences],
    [decomposeActions, this.differences, this.todo]
  ], cb)
}

function move (node, hoistTo, diff) {
  node.parent.children = without(node.parent.children, node)
  hoistTo.children.push(node)
  node.fromPath = node.path
  node.path = childPath(hoistTo.path, node)
  node.parent = hoistTo
  if (!diff.filter(function (action) { return action[0] === 'move' && action[1] === node }).length) {
    diff.push(['move', node])
  }
}

function moveRemainingChildren (node, diff) {
  node.children.forEach(function (child) {
    move(child, node, diff)
    moveRemainingChildren(child, diff)
  })
}

function remove (child, diff, done) {
  remove_(child, diff, new Set(), done)
}

function remove_ (child, diff, seen, done) {
  if (seen.has(child)) return done()
  seen.add(child)
  diff.push(['remove', child])
  child.parent.children = without(child.parent.children, child)
  asyncMap(child.children, function (child, next) {
    remove_(child, diff, seen, next)
  }, done)
}

function hoistChildren (tree, diff, next) {
  hoistChildren_(tree, diff, new Set(), next)
}

function hoistChildren_ (tree, diff, seen, next) {
  validate('OAOF', arguments)
  if (seen.has(tree)) return next()
  seen.add(tree)
  asyncMap(tree.children, function (child, done) {
    if (!tree.parent || child.fromBundle || child.package._inBundle) return hoistChildren_(child, diff, seen, done)
    var better = findRequirement(tree.parent, moduleName(child), getRequested(child) || npa(packageId(child)))
    if (better) {
      return chain([
        [remove, child, diff],
        [andComputeMetadata(tree)]
      ], done)
    }
    var hoistTo = earliestInstallable(tree, tree.parent, child.package, log)
    if (hoistTo) {
      move(child, hoistTo, diff)
      chain([
        [andComputeMetadata(hoistTo)],
        [hoistChildren_, child, diff, seen],
        [ function (next) {
          moveRemainingChildren(child, diff)
          next()
        } ]
      ], done)
    } else {
      done()
    }
  }, next)
}

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Editing: dedupe.js

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