How to use the check-more-types.positiveNumber function in check-more-types

function saveTopDependents (name, metric, n) {
  la(check.unemptyString(name), 'invalid package name', name)
  la(check.unemptyString(metric), 'invalid metric', metric)
  la(check.positiveNumber(n), 'invalid top number', n)

  var fetchTop = _.partial(npm.downloads, metric)
  return npm.topDependents(name, n)
    .then(fetchTop)
    .then(npm.sortedByDownloads)
    .then(function (dependents) {
      la(check.array(dependents), 'cannot select top n, not a list', dependents)
      console.log('limiting top downloads to first', n, 'from the list of', dependents.length)
      return _.take(dependents, n)
    })
    .then(function saveToFile (topDependents) {
      la(check.arrayOfStrings(topDependents), 'expected list of top strings', topDependents)
      // TODO use template library instead of manual concat
      var str = '// top ' + n + ' most dependent modules by ' + metric + ' for ' + name + '\n'
      str += '// data from NPM registry on ' + (new Date()).toDateString() + '\n'
      str += JSON.stringify(topDependents, null, 2) + '\n'

currentModuleInstallMethod = expandCommandVars(currentModuleInstallMethod)
      return runInFolder(dependentFolder, `${currentModuleInstallMethod}`, {
        success: `installed ${pkgName}`,
        failure: `installing ${pkgName} failed`
      })
    }
  }

  var depName = pkg.name + '-v' + pkg.version + '-against-' + moduleName
  var safeName = _.kebabCase(_.deburr(depName))
  debug('original name "%s", safe "%s"', depName, safeName)
  var toFolder = join(osTmpdir(), safeName)
  console.log('testing folder %s', quote(toFolder))

  var timeoutSeconds = options.timeout || INSTALL_TIMEOUT_SECONDS
  la(check.positiveNumber(timeoutSeconds), 'wrong timeout', timeoutSeconds, options)

  var installOptions = {
    name: moduleName,
    prefix: toFolder,
    cmd: expandCommandVars(dependentInstall)
  }

  var postInstallModuleInFolder = _.partialRight(postInstallInFolder, modulePostinstallCommand)

  var res = install(installOptions)
    .timeout(timeoutSeconds * 1000, 'install timed out for ' + moduleName)
    .then(formFullFolderName)
    .then(function checkInstalledFolder (folder) {
      la(check.unemptyString(folder), 'expected folder', folder)
      la(exists(folder), 'expected folder to exist', folder)
      return folder

function getReposPage(ghuser, k, allRepos) {
  la(check.positiveNumber(k), 'invalid repos page index', k);
  allRepos = allRepos || [];

  la(check.array(allRepos), 'expected all repos to be an array', allRepos);

  var defer = q.defer();

  console.log('fetching repos page', k);
  var perPage = 100;

  ghuser.repos(k, perPage, function (err, repos) {
    if (err) {
      console.error(err);
      defer.resolve(allRepos);
      return;
    }
    if (!check.array(repos) || repos.length === 0) {

function getTopDependents(name, n) {
  la(check.unemptyString(name), 'missing package name');
  la(check.positiveNumber(n), 'invalid top dependents to check', n);
  console.log('fetching top', n, 'dependent projects for', name);

  return Q.ninvoke(npm.packages, 'depended', name).then(function (dependents) {
    la(check.array(dependents),
      'expected modules dependent on', name, 'to be array', dependents);
    console.log('module', name, 'has', dependents.length, 'dependents');
    var names = _.pluck(dependents, 'name');
    return names;
  });
}