Backbone, from 1.1.2 to 1.2.3. Underscore, from 1.6.0 to 1.8.3.
The new versions of Backbone and Underscore offer numerous small bug fixes and some optimizations and other improvements. Check the [http://backbonejs.org/#changelog Backbone changelog] and [http://underscorejs.org/#changelog Underscore changelog] for the full details.
The new versions include some significant changes that may break existing code. Plugins or themes that rely on the bundled Backbone and/or Underscore libraries should carefully check functionality with the latest versions and run any available unit tests to ensure compatibility.
Some changes of note that were addressed in core as part of this upgrade:
* `_.flatten` no longer works with objects since Underscore.js 1.7. `_.flatten()` working with objects was an unintended side-affect of the implementation, see [https://github.com/jashkenas/underscore/issues/1904#issuecomment-60241576 underscore#1904]. Check any `_flatten` usage and only flatten arrays.
* As of Backbone 1.2.0, you can no longer modify the `events` hash or your view's `el` property in `initialize`, so don't try to modify them there.
* Since Underscore 1.7, Underscore templates no longer accept an initial data object. `_.template` always returns a function now so make sure you use it that way.
Props adamsilverstein.
Fixes#34350.
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Also update Underscore to 1.6. Includes the development versions of both, which are not included in the build.
Here is Backbone's changelog:
* Made the return values of Collection’s `set`, `add`, `remove`, and `reset` more useful. Instead of returning `this`, they now return the changed (added, removed or updated) model or list of
models. (This means they can no longer be chained.)
* Backbone Views no longer automatically attach options passed to the constructor as `this.options` and Backbone Models no longer attach `url` and `urlRoot` options, but you can do it yourself if you prefer. (But if you extend `wp.Backbone.View`, options will be attached for you.)
* All `"invalid"` events now pass consistent arguments. First the model in question, then the error object, then options.
* You are no longer permitted to change the id of your model during `parse`. Use `idAttribute` instead.
* On the other hand, `parse` is now an excellent place to extract and vivify incoming nested JSON into associated submodels.
See [27171] (next commit) for changes made to WordPress to be compatible with Backbone 1.1.
props gcorne, georgestephanis.
see #26799.
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