[substack]

You probably meant:

    var tr = require('trumpet')();
    tr.createReadStream('article > span')
      .pipe(process.stdout);
    
    var request = require('request');
    request.get('http://www.echojs.com').pipe(tr);

Bonus: I just noticed a simple bug in the selector engine from running your intended code that I just fixed in trumpet@1.5.6.