How to use the ember-cli/lib/ext/promise.map function in ember-cli

clearOutputPath: function(outputPath) {
    if (!fs.existsSync(outputPath)) { return Promise.resolve(); }

    var entries = fs.readdirSync(outputPath);
    return Promise.map(entries, function(entry){
      return rimraf(path.join(outputPath, entry));
    });
  },

return glob(exclusion, { cwd: dir, matchBase: true }).then(function(entries){
        return Promise.map(entries, function(entry) {
          return rimraf(path.join(dir, entry));
        });
      });
    });

deleteExcluded: function(dir, config){
    var exclusions = config.get('assets.exclude');
    return Promise.map(exclusions, function(exclusion){
      return glob(exclusion, { cwd: dir, matchBase: true }).then(function(entries){
        return Promise.map(entries, function(entry) {
          return rimraf(path.join(dir, entry));
        });
      });
    });
  }
});