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eas.json

eas.json is the configuration file for Expo Application Service (EAS). It allows you to create profiles for building and distributing your app.

Ignite includes a few default build profiles for common scenarios, but you can customize or add your own profiles too!

  • development - internal debug build for testing on simulators
  • development:device - internal debug build for testing on physical devices
  • preview - internal production build for testing on simulators
  • preview:device - internal production build for testing on physical devices
  • production - default production profile intended for external distribution

Note how profiles can share settings via extends:

"development": {
    "extends": "production",
    "distribution": "internal",
    "android": {
        "gradleCommand": ":app:assembleDebug"
    },
    "ios": {
        "buildConfiguration": "Debug",
        "simulator": true
    }
},
"development:device": {
    "extends": "development",
    "distribution": "internal",
    "ios": {
        "buildConfiguration": "Debug",
        "simulator": false
    }
},
"production": {}

In this example, development:device inherits the settings from development, but changes the ios setting to simulator: false. You can use extends to create a set of profiles to fit your needs without duplicating configuration.

View Expo's eas.json Documentation for more info.