raven wrapper with monkey patch for local logging

raven.js

var Raven = require('raven');

// Configure the Raven client from the Sentry DSN. For local development, keep this environment variable unset to prevent 
// Raven from sending events to sentry
var ravenClient = new Raven.Client(configOptions);

var originalCaptureException = ravenClient.captureException;

// Monkey patch the captureException function for easier development flow.
ravenClient.captureException = function() {
  // this._enabled is true if SENTRY_DSN is set. When developing locally, unset this environment variable.
  if (!this._enabled) {
    // the first parameter to captureException is the Error object.
    var err = arguments[0];
    console.error(err.stack || err);
  } else {
    originalCaptureException.apply(this, arguments);
  }
}

// Return the configured Raven client
module.exports = ravenClient;

Note that you should probably replace this line:

    originalCaptureException.apply(this, arguments);

with this line:

    return originalCaptureException.apply(this, arguments);

Compare the two outputs:

raven@1.2.1 alert: uncaughtException: undefined
raven@1.2.1 alert: uncaughtException: 990b6d61111b25fb9dd77302cc24119e

you can also use the whitelist url option