# [4.0.0](https://github.com/infinitered/ignite/compare/v3.5.3...v4.0.0) (2020-12-23)

### Features

* **cli:** 🔥  Ignite Flame 🔥 ([#1568](https://github.com/infinitered/ignite/issues/1568) by [@jamonholmgren](https://github.com/jamonholmgren), [@bryanstearns](https://github.com/bryanstearns), and [@fvonhoven](https://github.com/fvonhoven)) ([cec2c64](https://github.com/infinitered/ignite/commit/cec2c64f0280d74d13da214b63d76787371cfe04))

### BREAKING CHANGES

* **cli:** Ignite CLI has been completely rewritten for better maintainability and performance! This rewrite and 4.x release has been code-named "Ignite Flame".

Blog post: [https://shift.infinite.red/introducing-ignite-4-0-flame-1dfc891f9966]

### New CLI features and changes:

• Rewritten, slimmed-down CLI (just over 900 lines of code vs. over 3k for Ignite 3.x)
• Re-integrated the "Bowser" boilerplate back into the main repo for easier maintenance
• Switched to using the react-native CLI's template format
• New pretty output format
• Much better Expo support
• Completely rebuilt generator support (see blog post)
• Removed plugins (add & remove)
• Removed `ignite spork` (generators are sporked by default)

### New boilerplate features and changes

• Detox is now included in every new app
• Detox also works on Expo apps
• Much better Expo support
• Unimodules support included by default on non-Expo projects
• Updated React Native version
• Many other version bumps for dependencies

### Upgrading existing apps

Generally speaking, Ignite's main benefit is at the beginning of your project. If you used an older version of Ignite / Ignite Bowser to spin up your app, we don't recommend upgrading. If you wish, you could spin up a new version and copy over your changes to the new app.

If you have any trouble with the new CLI, let us know in the Infinite Red Community Slack: [https://community.infinite.red].

🔥 Happy Igniting! 🔥