Frequently Asked Questions

  Sapper is not 1.0 yet. Should I use it? What about SvelteKit?

Sapper has been deprecated in favor of it's successor, SvelteKit. Please see the migration guide for details on how to migrate to SvelteKit.

  Should I use Webpack or Rollup with Sapper?

Sapper offers both Rollup and Webpack templates. If you don't have a strong reason to prefer one over the other, we'd recommend using the Rollup template. The Rollup implementation supports additional features such as improved tree-shaking for smaller bundles, TypeScript, the ability to serve a legacy bundle to older browsers, and it automatically lists all your .js and .css files in the Link header to preload those files.

  How do I use TypeScript with Sapper?

The Sapper template project with Rollup (see Getting started) can be converted to TypeScript by running:

node scripts/setupTypeScript.js

You can also find a number of community templates that utilize TypeScript.

  Why is there a node_modules folder in the src folder of a Sapper project?

Before bundling your app, Sapper builds a special package for your app, which you can access by importing from @sapper/app. Putting it inside src/node_modules means that it won't get nuked when you add new dependencies, and that you can easily import from it using the Node resolution algorithm.