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?? access.js(3.23 KB)
?? adduser.js(3.98 KB)
?? bin.js(515 B)
?? bugs.js(857 B)
?? build.js(8.5 KB)
?? cache
?? cache.js(10.17 KB)
?? completion.js(7.06 KB)
?? config
?? config.js(8.27 KB)
?? dedupe.js(5.27 KB)
?? deprecate.js(1.4 KB)
?? dist-tag.js(3.67 KB)
?? docs.js(1.03 KB)
?? edit.js(985 B)
?? explore.js(1.63 KB)
?? fetch-package-metadata.js(11.5 KB)
?? fetch-package-metadata.md(1.76 KB)
?? get.js(235 B)
?? help-search.js(5.65 KB)
?? help.js(6.19 KB)
?? init.js(1.27 KB)
?? install
?? install-test.js(507 B)
?? install.js(25.49 KB)
?? link.js(5.55 KB)
?? logout.js(1.1 KB)
?? ls.js(13.94 KB)
?? npm.js(11.23 KB)
?? outdated.js(12.1 KB)
?? owner.js(7.55 KB)
?? pack.js(1.79 KB)
?? ping.js(556 B)
?? prefix.js(330 B)
?? prune.js(1.5 KB)
?? publish.js(5.02 KB)
?? rebuild.js(2.11 KB)
?? repo.js(1.43 KB)
?? restart.js(64 B)
?? root.js(316 B)
?? run-script.js(5.16 KB)
?? search.js(7.76 KB)
?? set.js(276 B)
?? shrinkwrap.js(6.54 KB)
?? star.js(1.17 KB)
?? stars.js(1.1 KB)
?? start.js(62 B)
?? stop.js(61 B)
?? substack.js(509 B)
?? tag.js(1.08 KB)
?? team.js(1.41 KB)
?? test.js(294 B)
?? unbuild.js(3.97 KB)
?? uninstall.js(2.31 KB)
?? unpublish.js(3.55 KB)
?? update.js(1.76 KB)
?? utils
?? version.js(7.71 KB)
?? view.js(9.12 KB)
?? visnup.js(4.01 KB)
?? whoami.js(1.42 KB)
?? xmas.js(1.57 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 filterInvalidActions = require('./install/filter-invalid-actions.js')
var recalculateMetadata = require('./install/deps.js').recalculateMetadata
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')

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

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.normalizeTree = function (log, cb) {
  validate('OF', arguments)
  log.silly('dedupe', 'normalizeTree')
  // If we're looking globally only look at the one package we're operating on
  if (npm.config.get('global')) {
    var args = this.args
    this.currentTree.children = this.currentTree.children.filter(function (child) {
      return args.filter(function (arg) { return arg === moduleName(child) }).length
    })
  }
  Installer.prototype.normalizeTree.call(this, log, cb)
}

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, function (next) { recalculateMetadata(this.idealTree, log, next) }]
  ], cb)
}

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'],
    [filterInvalidActions, this.where, this.differences],
    [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, {}, done)
}

function remove_ (child, diff, seen, done) {
  if (seen[child.path]) return done()
  seen[child.path] = true
  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, {}, next)
}

function hoistChildren_ (tree, diff, seen, next) {
  validate('OAOF', arguments)
  if (seen[tree.path]) return next()
  seen[tree.path] = true
  asyncMap(tree.children, function (child, done) {
    if (!tree.parent) return hoistChildren_(child, diff, seen, done)
    var better = findRequirement(tree.parent, moduleName(child), child.package._requested || npa(packageId(child)))
    if (better) {
      return chain([
        [remove, child, diff],
        [recalculateMetadata, tree, log]
      ], done)
    }
    var hoistTo = earliestInstallable(tree, tree.parent, child.package)
    if (hoistTo) {
      move(child, hoistTo, diff)
      chain([
        [recalculateMetadata, hoistTo, log],
        [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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