# Extend your App with Custom Code

- [App packages](/reference/build/extending-your-app-with-custom-code/app-packages.md)
- [App packages overview](/reference/build/extending-your-app-with-custom-code/app-packages/app-packages-overview.md)
- [PDF report package](/reference/build/extending-your-app-with-custom-code/app-packages/pdf-report-package.md)
- [TypeScript library & unit tests](/reference/build/extending-your-app-with-custom-code/app-packages/typescript-library-and-unit-tests.md)