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website/node_modules/npm/lib/update.js

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+'use strict'
+module.exports = update
+
+const url = require('url')
+const log = require('npmlog')
+const Bluebird = require('bluebird')
+const npm = require('./npm.js')
+const Installer = require('./install.js').Installer
+const usage = require('./utils/usage')
+const outdated = Bluebird.promisify(npm.commands.outdated)
+
+update.usage = usage(
+  'update',
+  'npm update [-g] [<pkg>...]'
+)
+
+update.completion = npm.commands.outdated.completion
+
+function update (args, cb) {
+  return update_(args).asCallback(cb)
+}
+
+function update_ (args) {
+  let dryrun = false
+  if (npm.config.get('dry-run')) dryrun = true
+
+  log.verbose('update', 'computing outdated modules to update')
+  return outdated(args, true).then((rawOutdated) => {
+    const outdated = rawOutdated.map(function (ww) {
+      return {
+        dep: ww[0],
+        depname: ww[1],
+        current: ww[2],
+        wanted: ww[3],
+        latest: ww[4],
+        req: ww[5],
+        what: ww[1] + '@' + ww[3]
+      }
+    })
+
+    const wanted = outdated.filter(function (ww) {
+      if (ww.current === ww.wanted && ww.wanted !== ww.latest) {
+        log.verbose(
+          'outdated',
+          'not updating', ww.depname,
+          "because it's currently at the maximum version that matches its specified semver range"
+        )
+      }
+      return ww.current !== ww.wanted && ww.latest !== 'linked'
+    })
+    if (wanted.length === 0) return
+
+    log.info('outdated', 'updating', wanted)
+    const toInstall = {}
+
+    wanted.forEach(function (ww) {
+      // use the initial installation method (repo, tar, git) for updating
+      if (url.parse(ww.req).protocol) ww.what = ww.req
+
+      const where = (ww.dep.parent && ww.dep.parent.path) || ww.dep.path
+      const isTransitive = !(ww.dep.requiredBy || []).some((p) => p.isTop)
+      const key = where + ':' + String(isTransitive)
+      if (!toInstall[key]) toInstall[key] = {where: where, opts: {saveOnlyLock: isTransitive}, what: []}
+      if (toInstall[key].what.indexOf(ww.what) === -1) toInstall[key].what.push(ww.what)
+    })
+    return Bluebird.each(Object.keys(toInstall), (key) => {
+      const deps = toInstall[key]
+      const inst = new Installer(deps.where, dryrun, deps.what, deps.opts)
+      return inst.run()
+    })
+  })
+}