Debugging

import Application from '@ember/application';

export default Application.extend({
  // Basic logging, e.g. "Transitioned into 'post'"
  LOG_TRANSITIONS: true,

  // Extremely detailed logging, highlighting every internal
  // step made while transitioning into a route, including
  // `beforeModel`, `model`, and `afterModel` hooks, and
  // information about redirects and aborted transitions
  LOG_TRANSITIONS_INTERNAL: true
});

ENV.APP.LOG_VIEW_LOOKUPS = true;

Ember.keys(Ember.TEMPLATES)

ENV.APP.LOG_ACTIVE_GENERATION = true;

Ember.observersFor(comments, keyName);

ENV.APP.LOG_BINDINGS = true;

This option logs all the lookups that are done to the console. Custom objects you've created yourself have a tick, and Ember generated ones don't.

It's useful for understanding which objects Ember is finding when it does a lookup and which it is generating automatically for you.

import Application from '@ember/application';

export default Application.extend({
  LOG_RESOLVER: true
});

Ember.ENV.RAISE_ON_DEPRECATION = true;
Ember.ENV.LOG_STACKTRACE_ON_DEPRECATION = true;

Ember.onerror = function(error) {
  Ember.$.ajax('/error-notification', {
    type: 'POST',
    data: {
      stack: error.stack,
      otherInformation: 'exception message'
    }
  });
}

If you are using imports with Ember, be sure to import the console:

Ember = {
  imports: {
    Handlebars: Handlebars,
    jQuery: $,
    console: window.console
  }
};

There are times when dealing with promises that it seems like any errors are being 'swallowed', and not properly raised. This makes it extremely difficult to track down where a given issue is coming from. Thankfully, RSVP has a solution for this problem built in.

You can provide an onerror function that will be called with the error details if any errors occur within your promise. This function can be anything, but a common practice is to call console.assert to dump the error to the console.

import { assert } from '@ember/debug';
import RSVP from 'rsvp';

RSVP.on('error', function(error) {
  assert(error, false);
});