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Sapper

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description Sapper Overview

Sapper is a discontinued application framework for building web applications with Svelte. It provided file-based routing, server-side rendering, code splitting, offline support, and static-site generation, allowing developers to create applications that could run on a Node.js server or be exported as static files. Sapper served as an early full-stack framework in the Svelte ecosystem and was succeeded by SvelteKit.

help Sapper FAQ

Is Sapper still maintained or should I use SvelteKit?

Sapper has been discontinued and replaced by SvelteKit, which is the official application framework for Svelte. The Svelte core team recommends that all new projects use SvelteKit and that existing Sapper projects be migrated.

What features did Sapper provide for Svelte applications?

Sapper offered file-based routing, server-side rendering, automatic code splitting, offline support via service workers, and static-site generation. These capabilities were designed to run on a Node.js server or be exported as a fully static site.

How do I migrate from Sapper to SvelteKit?

The official SvelteKit documentation includes a migration guide that covers changes to routing conventions, configuration files, and the adapter system. Most Sapper concepts carry over, but the project structure and some APIs have been reworked.

Why was Sapper replaced by SvelteKit rather than updated?

The Svelte team decided to build SvelteKit from the ground up to address architectural limitations in Sapper, including a more flexible adapter system and tighter integration with the Svelte compiler. SvelteKit also introduced improved TypeScript support and a more modular rendering pipeline.

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