Nov 3, 2023 – By Jared Galanis

Today the Ember project is releasing version 5.4 of Ember.js and Ember CLI. This release of Ember.js is an LTS (Long Term Support) candidate. LTS candidates prioritize stability over the addition of new features, and have an extended support schedule.

This release kicks off the 5.5 beta cycle for all sub-projects. We encourage our community (especially addon authors) to help test these beta builds and report any bugs before they are published as a final release in six weeks' time. The ember-try addon is a great way to continuously test your projects against the latest Ember releases.

You can read more about our general release process here:

• Release Dashboard
• The Ember Release Cycle
• The Ember Project
• Ember LTS Releases

Ember.js

Ember.js is the core framework for building ambitious web applications.

Changes in Ember.js 5.4

Ember.js 5.4 is an incremental, backwards compatible release of Ember with bug fixes, performance improvements, and minor deprecations.

Features

Ember.js 5.4 introduced 1 feature:

• #20521 Add TypeScript support for looking up controllers in the dependency injection registry

Bug fixes

Ember.js 5.4 introduced 2 bug fixes.

• #20529 - Don't rethrow string errors in handleTransitionReject
• #20210 - Fix hanging tests caused by legacy rsvp code

For more details on changes in Ember.js 5.4, please review the Ember.js 5.4.0 release page.

EmberData

EmberData is the official data persistence library for Ember.js applications.

EmberData did not release a new minor version during this release cycle, as such EmberData remains at 5.3 and 5.3 is a LTS candidate for EmberData.

Please see the blog post addressing EmberData's new versioning strategy for more information.

Ember CLI

Ember CLI is the command line interface for managing and packaging Ember.js applications.

Upgrading Ember CLI

You may upgrade Ember CLI using the ember-cli-update project:

npx ember-cli-update

This utility will help you to update your app or addon to the latest Ember CLI version. You will probably encounter merge conflicts, in which the default behavior is to let you resolve conflicts on your own. For more information on the ember-cli-update project, see the GitHub README.

It is not required to keep Ember CLI versions in sync with Ember and EmberData. After updating ember-cli, you can keep your current version(s) of Ember or EmberData by editing package.json to revert the changes to the lines containing ember-source and ember-data.

Changes in Ember CLI 5.4

Features

Ember CLI 5.4 introduced 4 new features.

• #10351 Remove ember-lts-4.4 scenario from addon blueprint
• #10352 Add official support for Node.js v20
• #10353 Remove all telemetry
• #10368 Streamline package-manager CLI options

Bug Fixes

Ember CLI 5.4 introduced 1 bug fix.

• #10345 App blueprint may not have explicit-any in ember-data types

Deprecations

Ember CLI 5.4 introduced 0 deprecations.

For more details on the changes in Ember CLI 5.4 and detailed upgrade instructions, please review the Ember CLI 5.4.0 release page.

Thank You!

As a community-driven open-source project with an ambitious scope, each of these releases serves as a reminder that the Ember project would not have been possible without your continued support. We are extremely grateful to our contributors for their efforts.