why is the node application doesn't exit with jsdom?

Hi all: I’m writing a node.js script to parse some html file with jsdom. The code looks like:

function parsingURL(file) {
    var fs = require('fs');
    var readFileSync = fs.readFileSync(file);
    var jsdom = require('jsdom');
    jsdom.env({
            html: readFileSync,
            scripts: ['http://code.jquery.com/jquery-1.11.2.min.js'],
            done: function (errors, window) {
                // free memory associated with the window
                if (errors) {
                    console.info(errors);
                } else {
                     console.info("success");
                }
            }
        }
    );
}；

The “success” is printed as expected, but why the node application still hangs without exiting?

[Sebmaster]

Make sure you call window.close() in your done callback.

[mbrevda]

While I don’t have much helpful to add, I’m seeing the same. After my callbacks are called, the process hangs for about two minutes until being killed. Code:

    return new Promise(function(resolve, reject) {
        jsdom.env({
            url: url,
            features: {
              FetchExternalResources   : ["script", "frame", "iframe", "link"],
              ProcessExternalResources : ['script']
            },
            virtualConsole: jsdom.createVirtualConsole().sendTo(console),
            done: function(err, window) {
                if (err) return reject(err)

                setTimeout(() => {
                    var doc = jsdom.serializeDocument(window.document)

                    mkdirp(path.dirname(filepath))
                        .then(utils.saveFile(filepath, doc))
                        //.then(() => window.close()) //<--- tried with/without + different variations
                        .then(resolve)
                }, 1000)
            }
        })
    })

edit to add that my then()'s are all called