const bundler = require('gulp-bem-bundler-fs');
const mergedBundler = require('gulp-bem-bundler-merged');
 
bundler('*.bundles/*')
    .pipe(mergedBundler({
        name: 'common',
        path: './*.bundles/common'
    }))
    .on('data', data => {
        console.log(data.name);
        console.log(data.decl);
    });
// common
// [ {block: 'a'}, {block: 'b'}, {block: 'c'}, ... ]