Support for Bun in EAS and Expo CLI

The first step (if you haven't yet) is to install Bun on your local machine. After installation, you should have access to bun in your terminal.

To create a new Expo app:

Run a package.json script:

Install a package:

You can also use Bun to install packages, but output a readable yarn.lock as well as the bun.lockb:

EAS will decide which packager to use based the lockfile in your codebase. So if you want EAS to use Bun, run bun install in your codebase and ensure it creates a bun.lockb - the Bun lockfile. As long as this lockfile is in your codebase, Bun will be used as the package manager for your builds.

EAS will use bun@1.0.2 by default. If you want or need to use a particular version of Bun, you can configure the exact version in each build in your eas.json.

{
  "build": {
    "test": {
      "bun": "1.0.0"
      // other settings...
    }
    // other build profiles...
  }
}