var smosh = require('smosh'),
    file  = smosh(vinylFile),
    data  = '';

file.on('data', function(chunk) {
    // file chunk stream
    data += chunk;
});

file.on('end', function(newBuffer, info) {
    // vinyl metadata if previously given
    console.log(newBuffer.toString());
    // or if data is streamed
    console.log(data);
    // percentage compressed
    console.log(info.percent)
});

file.on('error', function(err) {
    throw err;
});