How to use the npmlog.verbose function in npmlog

var req = null
    var requestOpts = {
        uri: url
      , headers: {
          'User-Agent': 'node-gyp v' + gyp.version + ' (node ' + process.version + ')'
        }
    }

    // basic support for a proxy server
    var proxyUrl = gyp.opts.proxy
                || process.env.http_proxy
                || process.env.HTTP_PROXY
                || process.env.npm_config_proxy
    if (proxyUrl) {
      if (/^https?:\/\//i.test(proxyUrl)) {
        log.verbose('download', 'using proxy url: "%s"', proxyUrl)
        requestOpts.proxy = proxyUrl
      } else {
        log.warn('download', 'ignoring invalid "proxy" config setting: "%s"', proxyUrl)
      }
    }
    try {
      // The "request" constructor can throw sometimes apparently :(
      // See: https://github.com/TooTallNate/node-gyp/issues/114
      req = request(requestOpts)
    } catch (e) {
      cb(e)
    }
    if (req) {
      req.on('response', function (res) {
        log.http(res.statusCode, url)
      })

return function resolver (what, cb) {
    if (!alreadyInstalledManually) return setTimeout(function () {
      resolver(what, cb)
    }, to++)

    // now we know what's been installed here manually,
    // or tampered with in some way that npm doesn't want to overwrite.
    if (alreadyInstalledManually.indexOf(what.split("@").shift()) !== -1) {
      log.verbose("already installed", "skipping %s %s", what, where)
      return cb(null, [])
    }

    // check for a version installed higher in the tree.
    // If installing from a shrinkwrap, it must match exactly.
    if (context.family[what]) {
      if (wrap && wrap[what].version === context.family[what]) {
        log.verbose("shrinkwrap", "use existing", what)
        return cb(null, [])
      }
    }

    // if it's identical to its parent, then it's probably someone
    // doing `npm install foo` inside of the foo project.  Print
    // a warning, and skip it.
    if (parent && parent.name === what && !npm.config.get("force")) {

function deref (err) {
          if (err) return cb(err)

          async--
          if (!async) {
            log.verbose('download contents checksum', JSON.stringify(contentShasums))
            // check content shasums
            for (var k in contentShasums) {
              log.verbose('validating download checksum for ' + k, '(%s == %s)', contentShasums[k], expectShasums[k])
              if (contentShasums[k] !== expectShasums[k]) {
                cb(new Error(k + ' local checksum ' + contentShasums[k] + ' not match remote ' + expectShasums[k]))
                return
              }
            }
            cb()
          }
        }
      }

function tryClone (from, combinedURL, silent, cb) {
  log.silly('tryClone', 'cloning', from, 'via', combinedURL)

  var normalized = normalizeGitUrl(combinedURL)
  var cloneURL = normalized.url
  var treeish = normalized.branch

  // ensure that similarly-named remotes don't collide
  var cachedRemote = uniqueFilename(remotes, combinedURL.replace(/[^a-zA-Z0-9]+/g, '-'), cloneURL)
  var repoID = path.relative(remotes, cachedRemote)
  cachedRemote = path.join(remotes, repoID)

  cb = inflight(repoID, cb)
  if (!cb) {
    return log.verbose('tryClone', repoID, 'already in flight; waiting')
  }
  log.verbose('tryClone', repoID, 'not in flight; caching')

  // initialize the remotes cache with the correct perms
  getGitDir(function (er) {
    if (er) return cb(er)
    fs.stat(cachedRemote, function (er, s) {
      if (er) return mirrorRemote(from, cloneURL, treeish, cachedRemote, silent, finish)
      if (!s.isDirectory()) return resetRemote(from, cloneURL, treeish, cachedRemote, finish)

      validateExistingRemote(from, cloneURL, treeish, cachedRemote, finish)
    })

    // always set permissions on the cached remote
    function finish (er, data) {
      if (er) return cb(er, data)

variables[opt.replace(/-/g, '_')] = gyp.opts[opt]
    })

    // ensures that any boolean values from `process.config` get stringified
    function boolsToString (k, v) {
      if (typeof v === 'boolean')
        return String(v)
      return v
    }

    log.silly('build/' + configFilename, config)

    // now write out the config.gypi file to the build/ dir
    var prefix = '# Do not edit. File was generated by `node-ninja configure`'
      , json = JSON.stringify(config, boolsToString, 2)
    log.verbose('build/' + configFilename, 'writing out config file: %s', configPath)
    configs.push(configPath)
    fs.writeFile(configPath, [prefix, json, ''].join('\n'), findConfigs)
  }

this.sender.send(message, { registrationTokens: registrationTokens }, 5, (error, response) => {
    // example response:
    /*
    {  "multicast_id":7680139367771848000,
      "success":0,
      "failure":4,
      "canonical_ids":0,
      "results":[ {"error":"InvalidRegistration"},
        {"error":"InvalidRegistration"},
        {"error":"InvalidRegistration"},
        {"error":"InvalidRegistration"}] }
    */
    if (error) {
      log.error(LOG_PREFIX, `send errored: %s`, JSON.stringify(error, null, 4));
    } else {
      log.verbose(LOG_PREFIX, `GCM Response: %s`, JSON.stringify(response, null, 4));
    }
    let { results, multicast_id } = response || {};
    registrationTokens.forEach((token, index) => {
      let resolve = resolvers[index];
      let result = results ? results[index] : undefined;
      let device = devicesMap[token];
      device.deviceType = 'android';
      let resolution = {
        device,
        multicast_id,
        response: error || result,
      };
      if (!result || result.error) {
        resolution.transmitted = false;
      } else {
        resolution.transmitted = true;

"node-gyp requires that the user's home directory is specified " +
    'in either of the environmental variables HOME or USERPROFILE. ' +
    'Overide with: --devdir /path/to/.node-gyp')
}

if (prog.todo.length === 0) {
  if (~process.argv.indexOf('-v') || ~process.argv.indexOf('--version')) {
    console.log('v%s', prog.version)
  } else {
    console.log('%s', prog.usage())
  }
  process.exit(0)
}

log.info('it worked if it ends with', 'ok')
log.verbose('cli', process.argv)
log.info('using', 'node-gyp@%s', prog.version)
log.info('using', 'node@%s | %s | %s', process.versions.node, process.platform, process.arch)

/**
 * Change dir if -C/--directory was passed.
 */

var dir = prog.opts.directory
if (dir) {
  var fs = require('fs')
  try {
    var stat = fs.statSync(dir)
    if (stat.isDirectory()) {
      log.info('chdir', dir)
      process.chdir(dir)
    } else {

fs.readFile(installVersionFile, 'ascii', function (err, ver) {
        if (err && err.code != 'ENOENT') {
          return cb(err)
        }
        var installVersion = parseInt(ver, 10) || 0
        log.verbose('got "installVersion"', installVersion)
        log.verbose('needs "installVersion"', gyp.package.installVersion)
        if (installVersion < gyp.package.installVersion) {
          log.verbose('install', 'version is no good; reinstalling')
          go()
        } else {
          log.verbose('install', 'version is good')
          cb()
        }
      })
    })

}, function (f, cb) {
            if (process.platform === "win32") {
              log.silly("chown", "skipping for windows", f)
              cb()
            } else if (typeof uid === "number"
                && typeof gid === "number"
                && parseInt(uid, 10) === uid
                && parseInt(gid, 10) === gid) {
              log.verbose("chown", f, [uid, gid])
              fs.chown(f, uid, gid, cb)
            } else {
              log.verbose("chown", "skip for invalid uid/gid", [f, uid, gid])
              cb()
            }
          }, function (er) {
            cb(er, data)

.then(function (originalChapter) {
                log.verbose('json', 'Found original data:\n' + JSON.stringify(originalChapter, null, 2))
                commitLog.push('Reused previous data from website to create `chapter.json`.')
                return Promise.resolve({
                  location: {
                    name: originalChapter.location,
                    country: originalChapter.country
                  },
                  twitter: originalChapter.twitter
                })
              })
              .catch(function (err) {