lib/express-zip.js
function(file, cb) {
    zip.entry(fs.createReadStream(file.path), { name: file.name }, cb);
  }
function(file, cb) {
    zip.entry(fs.createReadStream(file.path), { name: file.name }, cb);
  }
function ( file , cb ) { zip . entry ( fs . createReadStream ( file . path ) , { name : file . name } , cb ) ; }
res is a writable stream
res is a writable stream