Build configuration process

Ask you about the platform(s) to configure

When you run the command for the first time, it will initialize your EAS project and ask you to select the platform(s) you want to configure. If you only want to use EAS Build for a single platform, that's fine. If you change your mind, you can come back and configure the other later.

Create eas.json

The command will create an eas.json file in the root directory with the default configuration. It looks something like this:

{
  "build": {
    "development": {
      "developmentClient": true,
      "distribution": "internal"
    },
    "preview": {
      "distribution": "internal"
    },
    "production": {}
  }
}

If you have a bare project, it will look a bit different.

This is your EAS Build configuration. It defines three build profiles named "development", "preview", and "production" (you can have multiple build profiles like "production", "debug", "testing", and so on) for each platform. If you want to learn more about eas.json see the Configuration with eas.json page.

Configure the project

This step varies depending on the project type you have.

3.1

Initialization complete

This completes the initialization of your project to be compatible with EAS Build.

3.2

Expo project

If you haven't configured your app.json with android.package and/or ios.bundleIdentifier yet, EAS CLI will prompt you to specify them when you create your first build.

• android.package will be used as the Android application ID which is used to identify your app on the Google Play Store
• ios.bundleIdentifier will be used to identify you app on the Apple App Store

In the example above, the eas build --platform android command prompts to set the Android application ID. If you run the command with --platform ios, it will prompt you to set the iOS bundle identifier.

Next steps

That's all there is to configuring a project to be compatible with EAS Build. There is one more step, if you set cli.requireCommit to true in your eas.json — you'll be prompted to commit all the changes we made for you. You can choose to review them before committing, and you can either specify the git commit message or use a default message.