How to use the bower-json.find function in bower-json

TestRunner.prototype._makeBowerSandbox = function _makeBowerSandbox(next) {
  if (this._cancelled) return next('cancelled');
  // check bower.json, component.json, and .bower.json
  BowerJson.find(this._root, function(error, file) {
    if (error) return next(['No bower json file found', error]);

    BowerJson.read(file, function(error, info) {
      if (error) return next(['Invalid bower.json', error]);
      if (!(typeof info.name === 'string')) return next('package name is required');

      // Make sure the name doesn't break out of our sandbox
      var packageRoot = path.resolve(this._sandbox, info.name);
      if (packageRoot.indexOf(this._sandbox) !== 0) {
        return next('Inavlid package name: ' + info.name);
      }

      shelljs.mv(this._root, packageRoot);
      this._root = packageRoot;
      next();
    }.bind(this));

async.eachSeries(Object.keys(d), function (dep, next) {
      bowerJSON.find(__root + '/bower_components/' + dep, function (err, file) {
        if (file) {
          return next();
        }
        console.log('installing ' + dep);
        bower.commands
          .install([dep + '#' + d[dep]], {
            save: false,
            force: true,
            forceLatest: true
          })
          .on('error', function (err) {
            console.log('error installing bower dependency ' + dep + ' for ' + self.name);
            console.log(err);
            next();
          })
          .on('end', function () {

packages.forEach(function(package){
        bowerJson.find(path.resolve(options.directory, package), function(err, filename){
            if (!filename){
                output[package] = {licenses: 'UNKNOWN'};
                completed.push(package);
                return;
            }
            bowerJson.read(filename, function(err, bowerData){

                if (!!err) {
                    callback(null, err);
                    return;
                }

                var moduleInfo = {licenses: []};
                if (bowerData.license) moduleInfo.licenses = moduleInfo.licenses.concat(bowerData.license);
                if (bowerData.repository) moduleInfo.repository = bowerData.repository;
                if (bowerData.homepage) moduleInfo.homepage = bowerData.homepage;

return new Promise(function (resolve, reject) {
      bowerJson.find('.', function (err, filename) {
        if (err) {
          reject(err);
        } else {
          resolve(filename);
        }
      });
    }).then(function (filename) {
      return fs.readFileAsync(filename, 'utf8').then(function (content) {