express - ストリームを使用してPDFを出力する

Question

Expressjsを使用してPDFを出力するにはどうすればよいですか:

var fs = require('fs');
var PdfPrinter = require('pdfmake/src/printer');

app.get('/', function (req, res) {
    var printer = new PdfPrinter();

    var first = 'Another paragraph, this time a little bit longer to make sure, this line will be divided into at least two lines';

    var dd = {
        content: [
            first,
            'Another paragraph'
        ]
    };
    var pdfDoc = printer.createPdfKitDocument(dd);
    pdfDoc.pipe(fs.createWriteStream('basics.pdf')).on('finish',function(){
        //success

    });
    pdfDoc.end();
});