Incorrect gmail parsing with node-imap and mailparser

I'm writing a Node.js script that retrieves unread emails from my gmail inbox using node-imap, parses them with mailparser, and then does some work with the parsed emails. I'm running into a problem where the raw email being received doesn't seem to be parsed correctly by mailparser. I'm not sure if I've done something wrong in calling node-imap or mailparser, or if the email itself is in a bad format for some reason. I've included the code I'm running as well as the output produced.

var Imap = require("imap"),
    MailParser = require("mailparser").MailParser,
    Promise = require("bluebird"),
    request = require("request-promise").defaults({jar: true}),
    log = require("winston"),
    _ = require("underscore"),
    config = require("config").jobs;

var logConfig = _.clone(config.logConfig.email);
if (process.env.LOG_DIR) {
    logConfig.filename = process.env.LOG_DIR + "/" + logConfig.filename;
}
log.add(log.transports.File, logConfig || config.logConfig);

Promise.longStackTraces();

var imap = new Imap(config.emailConfig);
Promise.promisifyAll(imap);

imap.once("ready", execute);
imap.once("error", function (err) {
    log.error("Connection error: " + err.stack);
});
imap.connect();

function execute() {
    imap.openBoxAsync("INBOX", false)
        .then(function () {
            return imap.searchAsync(["UNSEEN"]);
        })
        .then(function (results) {
            var f = imap.fetch(results, {bodies: ["HEADER.FIELDS (FROM SUBJECT)", "TEXT"]});
            f.on("message", processMessage);
            f.once("error", function (err) {
                return Promise.reject(err);
            });
            f.once("end", function () {
                log.info("Done fetching all unseen messages.");
                imap.end();
            });
        })
        .catch(function (err) {
            log.error("Error fetching messages: " + err.stack);
            imap.end();
        });
}

function processMessage(msg, seqno) {
    log.info("Processing msg #" + seqno);

    var parser = new MailParser();
    parser.on("headers", function(headers) {
       log.info("Header: " + JSON.stringify(headers));
    });
    parser.on("end", function(msg) {
        log.info("From: " + msg.from);
        log.info("Subject: " + msg.subject);
        log.info("Text: " + msg.text);
        log.info("Html: " + msg.html);
    });

    msg.on("body", function (stream) {
        stream.on("data", function (chunk) {
            parser.write(chunk.toString("utf8"));
        });
    });
    msg.once("end", function () {
        log.info("Finished msg #" + seqno);
        parser.end();
    });
}

Output:

info: Processing msg #1
info: Finished msg #1
info: Done fetching all unseen messages.
info: Header: {"--001a11339690da942a051d866a04":"","content-type":"text/plain; charset=UTF-8"}
info: From: undefined
info: Subject: undefined
info: Text: Test app mail body!

- Jared

--001a11339690da942a051d866a04
Content-Type: text/html; charset=UTF-8

<div dir="ltr"><div>Test app mail body!<br><br></div>- Jared<br></div>

--001a11339690da942a051d866a04--
Subject: Here is a test appmail email
From: Jared Wolinsky <jared.wolinsky@gmail.com>


info: Html: undefined

You're fetching the raw body of the email. mailparser is expecting the full email, headers and body both. To fetch that instead, just specify an empty string '' instead of 'TEXT'.