text: const util = require('util')
  const Arborist = require('@npmcli/arborist')
  const rimraf = util.promisify(require('rimraf'))
  const reifyFinish = require('./utils/reify-finish.js')
  const runScript = require('@npmcli/run-script')
  const fs = require('fs')
  const readdir = util.promisify(fs.readdir)
  
  const log = require('npmlog')
  
  const removeNodeModules = async where => {
    const rimrafOpts = { glob: false }
    process.emit('time', 'npm-ci:rm')
    const path = `${where}/node_modules`
    // get the list of entries so we can skip the glob for performance
    const entries = await readdir(path, null).catch(er => [])
    await Promise.all(entries.map(f => rimraf(`${path}/${f}`, rimrafOpts)))
    process.emit('timeEnd', 'npm-ci:rm')
  }
  const ArboristWorkspaceCmd = require('./workspaces/arborist-cmd.js')
  
  class CI extends ArboristWorkspaceCmd {
    /* istanbul ignore next - see test/lib/load-all-commands.js */
    static get description () {
      return 'Install a project with a clean slate'
    }
  
    /* istanbul ignore next - see test/lib/load-all-commands.js */
    static get name () {
      return 'ci'
    }
  
    /* istanbul ignore next - see test/lib/load-all-commands.js */
    static get params () {
      return [
        'ignore-scripts',
        'script-shell',
      ]
    }
  
    exec (args, cb) {
      this.ci().then(() => cb()).catch(cb)
    }
  
    async ci () {
      if (this.npm.config.get('global')) {
        const err = new Error('`npm ci` does not work for global packages')
        err.code = 'ECIGLOBAL'
        throw err
      }
  
      const where = this.npm.prefix
      const opts = {
        ...this.npm.flatOptions,
        path: where,
        log: this.npm.log,
        save: false, // npm ci should never modify the lockfile or package.json
        workspaces: this.workspaces,
      }
  
      const arb = new Arborist(opts)
      await Promise.all([
        arb.loadVirtual().catch(er => {
          log.verbose('loadVirtual', er.stack)
          const msg =
            'The `npm ci` command can only install with an existing package-lock.json or\n' +
            'npm-shrinkwrap.json with lockfileVersion >= 1. Run an install with npm@5 or\n' +
            'later to generate a package-lock.json file, then try again.'
          throw new Error(msg)
        }),
        removeNodeModules(where),
      ])
      await arb.reify(opts)
  
      const ignoreScripts = this.npm.config.get('ignore-scripts')
      // run the same set of scripts that `npm install` runs.
      if (!ignoreScripts) {
        const scripts = [
          'preinstall',
          'install',
          'postinstall',
          'prepublish', // XXX should we remove this finally??
          'preprepare',
          'prepare',
          'postprepare',
        ]
        const scriptShell = this.npm.config.get('script-shell') || undefined
        for (const event of scripts) {
          await runScript({
            path: where,
            args: [],
            scriptShell,
            stdio: 'inherit',
            stdioString: true,
            banner: log.level !== 'silent',
            event,
          })
        }
      }
      await reifyFinish(this.npm, arb)
    }
  }
  
  module.exports = CI
  