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?? ..
?? build.js(425 B)
?? extract.js(2.79 KB)
?? fetch.js(882 B)
?? finalize.js(2.74 KB)
?? global-install.js(606 B)
?? global-link.js(242 B)
?? install.js(298 B)
?? move.js(3.16 KB)
?? postinstall.js(306 B)
?? preinstall.js(305 B)
?? prepublish.js(305 B)
?? remove.js(2.42 KB)
?? test.js(293 B)
?? update-linked.js(356 B)

Editing: extract.js

'use strict'
var path = require('path')
var iferr = require('iferr')
var asyncMap = require('slide').asyncMap
var fs = require('graceful-fs')
var rename = require('../../utils/rename.js')
var gentlyRm = require('../../utils/gently-rm.js')
var updatePackageJson = require('../update-package-json')
var npm = require('../../npm.js')
var moduleName = require('../../utils/module-name.js')
var packageId = require('../../utils/package-id.js')
var cache = require('../../cache.js')
var buildPath = require('../build-path.js')

module.exports = function (top, buildpath, pkg, log, next) {
  log.silly('extract', packageId(pkg))
  var up = npm.config.get('unsafe-perm')
  var user = up ? null : npm.config.get('user')
  var group = up ? null : npm.config.get('group')
  cache.unpack(pkg.package.name, pkg.package.version, buildpath, null, null, user, group,
        andUpdatePackageJson(pkg, buildpath, andStageBundledChildren(pkg, buildpath, log, next)))
}

function andUpdatePackageJson (pkg, buildpath, next) {
  return iferr(next, function () {
    updatePackageJson(pkg, buildpath, next)
  })
}

function andStageBundledChildren (pkg, buildpath, log, next) {
  var staging = path.resolve(buildpath, '..')
  return iferr(next, function () {
    for (var i = 0; i < pkg.children.length; ++i) {
      var c = pkg.children[i]
      if (!c.package.name) return next(c.error)
    }

asyncMap(pkg.children, andStageBundledModule(pkg, staging, buildpath), cleanupBundled)
  })
  function cleanupBundled () {
    gentlyRm(path.join(buildpath, 'node_modules'), next)
  }
}

function andStageBundledModule (bundler, staging, parentPath) {
  return function (child, next) {
    stageBundledModule(bundler, child, staging, parentPath, next)
  }
}

function getTree (pkg) {
  while (pkg.parent) pkg = pkg.parent
  return pkg
}

function warn (pkg, code, msg) {
  var tree = getTree(pkg)
  var err = new Error(msg)
  err.code = code
  tree.warnings.push(err)
}

function stageBundledModule (bundler, child, staging, parentPath, next) {
  var stageFrom = path.join(parentPath, 'node_modules', child.package.name)
  var stageTo = buildPath(staging, child)

asyncMap(child.children, andStageBundledModule(bundler, staging, stageFrom), iferr(next, moveModule))

function moveModule () {
    if (child.fromBundle) {
      return rename(stageFrom, stageTo, iferr(next, updateMovedPackageJson))
    } else {
      return fs.stat(stageFrom, function (notExists, exists) {
        if (exists) {
          warn(bundler, 'EBUNDLEOVERRIDE', 'In ' + packageId(bundler) +
            ' replacing bundled version of ' + moduleName(child) +
            ' with ' + packageId(child))
          return gentlyRm(stageFrom, next)
        } else {
          return next()
        }
      })
    }
  }

function updateMovedPackageJson () {
    updatePackageJson(child, stageTo, next)
  }
}

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Editing: extract.js

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