The last part of the book goes beyond Svelte and Sapper to explore preprocessing source files that can add support for alternate syntaxes. Examples include Sass, TypeScript, and Markdown. We’ll return to Svelte Native and build mobile applications for Android and iOS. In particular, we’ll focus on components for display, forms, actions, dialogs, layout, and navigation, as well as details about styling them, all through an example app that demonstrates how to implement them.