code: function copy(inputdir, outputdir, options) {
  	const _options = Object.assign({ dir: '.' }, options);
  	fsPlus.copySync(path.join(inputdir, _options.dir), outputdir);
  	return Promise.resolve();
  }
docs: This is because Gobble's grab and Rollup's resolution is broken https://github.com/gobblejs/gobble/issues/89 https://github.com/rollup/rollup/issues/1291