expo-constants

What is expo-constants?

The expo-constants package provides system information that is useful for building and debugging React Native applications. It includes constants such as the app's manifest, device information, and platform-specific details.

What are expo-constants's main functionalities?

App Constants

This feature allows you to access the app's manifest, which includes information such as the app's name, version, and other metadata.

const Constants = require('expo-constants');
console.log(Constants.manifest);

Device Information

This feature provides information about the device, such as the device name, which can be useful for debugging and analytics.

const Constants = require('expo-constants');
console.log(Constants.deviceName);

Platform-specific Constants

This feature gives you access to platform-specific constants, such as the operating system and its version, which can help in writing platform-specific code.

const Constants = require('expo-constants');
console.log(Constants.platform);

Other packages similar to expo-constants

react-native-device-info

The react-native-device-info package provides device information such as device ID, system name, and system version. It is similar to expo-constants but offers more detailed device-specific information.

expo-device

The expo-device package offers detailed information about the device, including device model, manufacturer, and total memory. It is more focused on device-specific details compared to expo-constants.

react-native-config

The react-native-config package allows you to manage environment-specific configurations. While it doesn't provide system information like expo-constants, it is useful for managing different configurations for different environments.

README

expo-constants

Provides system information that remains constant throughout the lifetime of your app.

API documentation

• Documentation for the main branch
• Documentation for the latest stable release

Installation in managed Expo projects

For managed Expo projects, please follow the installation instructions in the API documentation for the latest stable release.

Installation in bare React Native projects

For bare React Native projects, you must ensure that you have installed and configured the expo package before continuing.

Add the package to your npm dependencies

expo install expo-constants

Monorepo Support

In a monorepo, the expo-constants package might be in a different folder than the native scripts are expecting. You can easily symlink the node module to your app's local node_modules folder by doing the following:

• Follow the setup instructions for expo-yarn-workspaces.
• Add the following configuration to your app's package.json:

{
  "expo-yarn-workspaces": {
    "symlinks": ["expo-constants"]
  }
}

• Finally, run yarn in the app folder to create symlinks to expo-constants in your app's local node_modules folder.

Contributing

Contributions are very welcome! Please refer to guidelines described in the contributing guide.