Node.js file download gets truncated by "require" statement

I'm trying to download and require a .js file using a node.js script, but only part of the file is being downloaded.

Specifically, this is the part that seems to be causing the problem:

response.on('data', function (chunk) {
    out.write(chunk);
    var theModule = require(__dirname + "/" + filename);
    //less than half of the file is downloaded when the above line is included.
});

Here is the full source code:

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

downloadModule("functionChecker.js");

function downloadModule(filename) {
    var google = http.createClient(80, 'www.google.com');
    var request = google.request('GET', '/svn/' + filename, {
        'host': 'javascript-modules.googlecode.com'
    });
    request.end();
    out = fs.createWriteStream(filename);
    request.on('response', function (response) {
        response.setEncoding('utf8');
        response.on('data', function (chunk) {
            out.write(chunk);
            var theModule = require(__dirname + "/" + filename);
            //less than half of the file is downloaded when the above line is included.
            //If the import statement is omitted, then the file is downloaded normally.
        });
    });
}