How to use the verror.WError function in verror

app.get("/v1/:username", async (req, res, next) => {
  try {
    const { username } = req.params;
    const { format } = req.query;
    const key = `${username}-${format}`;
    const cached = cache.get(key);
    if (cached !== null) {
      return res.json(cached);
    }
    const data = await fetch(username, format);
    cache.put(key, data, 1000 * 3600); // Store for an hour
    res.json(data);
  } catch (err) {
    next(new VError(err, alerts.error.profileDisabled));
  }
});

socket.on("message", async function(message, remote) {
  // await lastMessageProcess;
  // log.info(remote.address + ':' + remote.port +' - ' + message);
  // await Promise.all(outstandingInserts); // wait for all prior inserts to occur
  let parsed;

  try {
    parsed = parse(message);
  } catch (err) {
    let wrapped = new verror.WError(
      err,
      "Error parsing from: " +
        remote.address +
        ":" +
        remote.port +
        " , message: " +
        message
    );
    throw wrapped;
  }

  if (insertrawevents) {
    let raw = r
      .table("rawevents")
      .insert({
        host: os.hostname(),

import VError = require("verror");
import { VError as VError2, MultiError, SError, WError } from "verror";

const error = new Error("foo");
const verror1 = new VError(error, "bar");
const verror2 = new VError2(error, "bar");
const serror = new SError(error, "bar");
const multiError = new MultiError([verror1, verror2]);
const werror = new WError(verror1, "foobar");

const verror3 = new VError({
    name: "fooError",
    cause: error,
    info: {
        "info0": "baz"
    }
}, "bar");

const verror4 = new VError({ cause: null }, "bar");

const cause1: Error | undefined = verror1.cause();
const cause2: Error | undefined = werror.cause();

const info: { [k: string]: any } = VError.info(verror3);
const namedCause: Error | null = VError.findCauseByName(verror3, "fooError");

}

            /*
             * It's possible to ignore the following warnings, so we collect
             * them in one place in order to print them to the operator in a
             * later prompt.
             */
            var warnings = [];

            if (_.fullState.pgs_errors.length) {
                warnings.push(new VError.WError(new VError.MultiError(
                    _.fullState.pgs_errors), 'cluster has errors'));
            }

            if (_.fullState.pgs_warnings.length) {
                warnings.push(new VError.WError(new VError.MultiError(
                    _.fullState.pgs_warnings), 'cluster has warnings'));
            }

            /*
             * We need to check the replication LSNs here to ensure we have
             * genuine lag, as opposed to the cluster just not taking any
             * writes.
             */
            var replErrs = [];
            jsprim.forEachKey(_.fullState.pgs_peers, function (key, peer) {
                var lag_in_seconds = lagInSeconds(peer.pgp_lag);
                if (lag_in_seconds instanceof Error) {
                    replErrs.push(new VError(lag_in_seconds, '"%s"',
                        peer.pgp_label));
                }
                if (lag_in_seconds !== null && lag_in_seconds > _.lagToIgnore) {

res.on('end', function () {
                        var body = chunks.join('');
                        var data;
                        try {
                            data = JSON.parse(body);
                        } catch (syntaxErr) {
                            callback(new WError(syntaxErr,
                                'invalid image data in response: \'%s\'',
                                body));
                            return;
                        }
                        callback(null, data, res);
                    });
                });

}

            if (_.fullState.pgs_singleton) {
                cb(new VError('cluster is in singleton mode'));
                return;
            }

            /*
             * It's possible to ignore the following warnings, so we collect
             * them in one place in order to print them to the operator in a
             * later prompt.
             */
            var warnings = [];

            if (_.fullState.pgs_errors.length) {
                warnings.push(new VError.WError(new VError.MultiError(
                    _.fullState.pgs_errors), 'cluster has errors'));
            }

            if (_.fullState.pgs_warnings.length) {
                warnings.push(new VError.WError(new VError.MultiError(
                    _.fullState.pgs_warnings), 'cluster has warnings'));
            }

            /*
             * We need to check the replication LSNs here to ensure we have
             * genuine lag, as opposed to the cluster just not taking any
             * writes.
             */
            var replErrs = [];
            jsprim.forEachKey(_.fullState.pgs_peers, function (key, peer) {
                var lag_in_seconds = lagInSeconds(peer.pgp_lag);

* writes.
             */
            var replErrs = [];
            jsprim.forEachKey(_.fullState.pgs_peers, function (key, peer) {
                var lag_in_seconds = lagInSeconds(peer.pgp_lag);
                if (lag_in_seconds instanceof Error) {
                    replErrs.push(new VError(lag_in_seconds, '"%s"',
                        peer.pgp_label));
                }
                if (lag_in_seconds !== null && lag_in_seconds > _.lagToIgnore) {
                    replErrs.push(new VError('"%s" has %ds of lag behind ' +
                        'its upstream peer', peer.pgp_label, lag_in_seconds));
                }
            });
            if (replErrs.length) {
                warnings.push(new VError.WError(new VError.MultiError(replErrs),
                    'cluster is exhibiting lag'));
            }

            _.clusterWarnings = warnings;

            cb();
        },
        function promptForWarnings(_, cb) {

async function getMediaUrl(base64data) {
    try {
      const buff = dataUriToBuffer(base64data);
      const mediaResponse = await twitterClient.post("media/upload", {
        media_data: buff.toString("base64")
      });
      const tweetResponse = await twitterClient.post("statuses/update", {
        status: "canvas",
        media_ids: mediaResponse.media_id_string
      });
      return tweetResponse.entities.media[0].media_url.replace(
        "http://",
        "https://"
      );
    } catch (err) {
      throw new VError(err, alerts.error.imageUploadFailed);
    }
  };

app.post("/v1/tweetMedia", (req, res, next) => {
  const { image } = req.body;

  if (typeof image !== "string") {
    return next(new VError(alerts.error.imageInvalid));
  }

  getTwitterMediaUrl(image)
    .then(mediaUrl =>
      res.json({
        mediaUrl
      })
    )
    .catch(next);
});