Expo is an open-source framework for building universal native applications that run on Android, iOS, and the web using React and JavaScript. The repository serves as the central hub for the Expo ecosystem, containing the Expo SDK, Modules API, CLI, Router, documentation, and supporting tools. The project is written in TypeScript and licensed under the MIT license, making it freely available for use and modification.
The repository is organized into several key directories that reflect its comprehensive scope. The packages directory contains all source code for Expo modules, allowing developers to understand and modify individual libraries. The apps directory houses Expo projects linked to development modules, with the expo-go subdirectory containing the source code for the Expo Go application itself. The docs directory provides the source for the official documentation at docs.expo.dev, while templates contains starter projects generated by the create-expo-app command. Additional directories include react-native-lab, which is Expo's fork of React Native used to build Expo Go, guides for advanced topics, tools for build and configuration, and template-files for managing configuration with private keys.
The project maintains exceptionally fast issue and pull request response times, with a median latency of 0.0 hours and a mean of 2.3 hours across 4,477 tracked items. This responsiveness reflects active community engagement and maintenance. The most frequently applied issue labels are outdated with 3,345 occurrences, needs review with 1,631, and incomplete issue: missing or invalid repro with 998, indicating the team's focus on keeping the codebase current and ensuring quality issue reports. The most active contributors tracked include brentvatne with 2,061 events, byCedric with 924 events, and Kudo with 915 events, demonstrating consistent leadership in the project's development.
Expo's influence extends across the broader development ecosystem, with overlapping contributors shared with major projects including Microsoft's VSCode, Microsoft's TypeScript, and the Rust language project. This cross-pollination suggests Expo's integration into the wider developer tooling landscape. The framework is classified across multiple domains including React Native, mobile development, cross-platform apps, JavaScript frameworks, iOS, Android, the Expo SDK, app deployment, development tools, and native modules, reflecting its multifaceted role in the mobile development space.
The project includes Expo Application Services (EAS), a platform of hosted services deeply integrated with the open-source tools that help developers build, ship, and iterate on applications individually or as teams. The repository provides comprehensive documentation, a browser-based testing environment through Snack, and maintains active community channels including Discord, forums, and social media presence on X, GitHub, Reddit, Bluesky, and LinkedIn. The project emphasizes community guidelines and welcomes contributions through its documented contribution process.
