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?? ..
?? ansi-trim.js(211 B)
?? cache-file.js(1.7 KB)
?? child-path.js(290 B)
?? completion
?? completion.sh(1.74 KB)
?? correct-mkdir.js(1.24 KB)
?? deep-sort-object.js(363 B)
?? depr-check.js(451 B)
?? did-you-mean.js(446 B)
?? error-handler.js(6.04 KB)
?? error-message.js(13.44 KB)
?? escape-arg.js(657 B)
?? escape-exec-path.js(761 B)
?? funding.js(4.48 KB)
?? gently-rm.js(484 B)
?? git.js(1.7 KB)
?? gunzip-maybe.js(556 B)
?? is-registry.js(294 B)
?? is-windows-bash.js(166 B)
?? is-windows-shell.js(153 B)
?? is-windows.js(59 B)
?? lifecycle-cmd.js(496 B)
?? lifecycle.js(364 B)
?? link.js(234 B)
?? locker.js(1.81 KB)
?? metrics-launch.js(1.08 KB)
?? metrics.js(2.17 KB)
?? module-name.js(973 B)
?? move.js(290 B)
?? no-progress-while-running.js(541 B)
?? open-url.js(819 B)
?? otplease.js(721 B)
?? output.js(210 B)
?? package-id.js(399 B)
?? parse-json.js(653 B)
?? perf.js(548 B)
?? pick-manifest-from-registry-metadata.js(895 B)
?? pulse-till-done.js(783 B)
?? read-local-package.js(329 B)
?? read-user-info.js(2.08 KB)
?? replace-info.js(556 B)
?? save-stack.js(349 B)
?? spawn.js(1.38 KB)
?? temp-filename.js(173 B)
?? umask.js(343 B)
?? unix-format-path.js(85 B)
?? unsupported.js(1.29 KB)
?? usage.js(576 B)
?? warn-deprecated.js(556 B)

Editing: locker.js

var crypto = require('crypto')
var resolve = require('path').resolve

var lockfile = require('lockfile')
var log = require('npmlog')

var npm = require('../npm.js')
var correctMkdir = require('../utils/correct-mkdir.js')

var installLocks = {}

function lockFileName (base, name) {
  var c = name.replace(/[^a-zA-Z0-9]+/g, '-').replace(/^-+|-+$/g, '')
  var p = resolve(base, name)
  var h = crypto.createHash('sha1').update(p).digest('hex')
  var l = resolve(npm.cache, '_locks')

return resolve(l, c.substr(0, 24) + '-' + h.substr(0, 16) + '.lock')
}

function lock (base, name, cb) {
  var lockDir = resolve(npm.cache, '_locks')
  correctMkdir(lockDir, function (er) {
    if (er) return cb(er)

var opts = {
      stale: npm.config.get('cache-lock-stale'),
      retries: npm.config.get('cache-lock-retries'),
      wait: npm.config.get('cache-lock-wait')
    }
    var lf = lockFileName(base, name)
    lockfile.lock(lf, opts, function (er) {
      if (er) log.warn('locking', lf, 'failed', er)

if (!er) {
        log.verbose('lock', 'using', lf, 'for', resolve(base, name))
        installLocks[lf] = true
      }

cb(er)
    })
  })
}

function unlock (base, name, cb) {
  var lf = lockFileName(base, name)
  var locked = installLocks[lf]
  if (locked === false) {
    return process.nextTick(cb)
  } else if (locked === true) {
    lockfile.unlock(lf, function (er) {
      if (er) {
        log.warn('unlocking', lf, 'failed', er)
      } else {
        installLocks[lf] = false
        log.verbose('unlock', 'done using', lf, 'for', resolve(base, name))
      }

cb(er)
    })
  } else {
    var notLocked = new Error(
      'Attempt to unlock ' + resolve(base, name) + ", which hasn't been locked"
    )
    notLocked.code = 'ENOTLOCKED'
    throw notLocked
  }
}

module.exports = {
  lock: lock,
  unlock: unlock
}

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Editing: locker.js

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