# JourneyApps Syntax

- [Async & Await](/reference/build/syntax/async-and-await.md)
- [TypeScript Apps](/reference/build/syntax/typescript-apps.md)
- [runtime-build package](/reference/build/syntax/typescript-apps/runtime-build-package.md)
- [TypeScript App Troubleshooting](/reference/build/syntax/typescript-apps/typescript-app-troubleshooting.md)
- [What's New in V4](/reference/build/syntax/whats-new-in-v4.md)
- [Updating to the V4 API](/reference/build/syntax/whats-new-in-v4/updating-to-the-v4-api.md)