demos/Demo/Day2/2-FileSystem/9.decompress_zlib.js

var fs = require('fs');
var zlib = require('zlib');

var gunzip = zlib.createGunzip();
var rstream = fs.createReadStream('test.txt.gz');

rstream   // reads from myfile.txt.gz
  .pipe(gunzip)  // uncompresses
  .pipe(process.stdout);  // writes to stdout