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Static site generation

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To use SvelteKit as a static site generator (SSG), use adapter-static.

This will prerender your entire site as a collection of static files. If you'd like to prerender only some pages and dynamically server-render others, you will need to use a different adapter together with the prerender option.

Usage

Install with npm i -D @sveltejs/adapter-static, then add the adapter to your svelte.config.js:

svelte.config.js
ts
import adapter from '@sveltejs/adapter-static';
Cannot find module '@sveltejs/adapter-static' or its corresponding type declarations.2307Cannot find module '@sveltejs/adapter-static' or its corresponding type declarations.


export default {
    kit: {
        adapter: adapter({
            // default options are shown. On some platforms
            // these options are set automatically — see below
            pages: 'build',
            assets: 'build',
            fallback: null,
            precompress: false,
            strict: true
        })
    }
};

...and add the prerender option to your root layout:

src/routes/+layout.js
ts
// This can be false if you're using a fallback (i.e. SPA mode)
export const prerender = true;

You must ensure SvelteKit's trailingSlash option is set appropriately for your environment. If your host does not render /a.html upon receiving a request for /a then you will need to set trailingSlash: 'always' to create /a/index.html instead.

Zero-config support

Some platforms have zero-config support (more to come in future):

On these platforms, you should omit the adapter options so that adapter-static can provide the optimal configuration:

svelte.config.js
export default {
    kit: {
		adapter: adapter({...})
		adapter: adapter()
    }
};

Options

pages

The directory to write prerendered pages to. It defaults to build.

assets

The directory to write static assets (the contents of static, plus client-side JS and CSS generated by SvelteKit) to. Ordinarily this should be the same as pages, and it will default to whatever the value of pages is, but in rare circumstances you might need to output pages and assets to separate locations.

fallback

Specify a fallback page for SPA mode, e.g. index.html or 200.html or 404.html.

precompress

If true, precompresses files with brotli and gzip. This will generate .br and .gz files.

strict

By default, adapter-static checks that either all pages and endpoints (if any) of your app were prerendered, or you have the fallback option set. This check exists to prevent you from accidentally publishing an app where some parts of it are not accessible, because they are not contained in the final output. If you know this is ok (for example when a certain page only exists conditionally), you can set strict to false to turn off this check.

GitHub Pages

When building for GitHub Pages, make sure to update paths.base to match your repo name, since the site will be served from https://your-username.github.io/your-repo-name rather than from the root.

You will have to prevent GitHub's provided Jekyll from managing your site by putting an empty .nojekyll file in your static folder.

A config for GitHub Pages might look like the following:

svelte.config.js
ts
import adapter from '@sveltejs/adapter-static';
Cannot find module '@sveltejs/adapter-static' or its corresponding type declarations.2307Cannot find module '@sveltejs/adapter-static' or its corresponding type declarations.


const dev = process.argv.includes('dev');


/** @type {import('@sveltejs/kit').Config} */
const config = {
    kit: {
        adapter: adapter(),
        paths: {
            base: dev ? '' : process.env.BASE_PATH,
Type 'string | undefined' is not assignable to type '"" | `/${string}` | undefined'.
  Type 'string' is not assignable to type '"" | `/${string}` | undefined'.2322Type 'string | undefined' is not assignable to type '"" | `/${string}` | undefined'.
  Type 'string' is not assignable to type '"" | `/${string}` | undefined'.
        }
    }
};

You can use GitHub actions to automatically deploy your site to GitHub Pages when you make a change. Here's an example workflow:

.github/workflows/deploy.yml
yaml
name: Deploy to GitHub Pages


on:
  push:
    branches: 'main'


jobs:
  build_site:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3


      # If you're using pnpm, add this step then change the commands and cache key below to use `pnpm`
      # - name: Install pnpm
      #   uses: pnpm/action-setup@v2
      #   with:
      #     version: 8


      - name: Install Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 18
          cache: npm


      - name: Install dependencies
        run: npm install


      - name: build
        env:
          BASE_PATH: '/your-repo-name'
        run: |
          npm run build
          touch build/.nojekyll


      - name: Upload Artifacts
        uses: actions/upload-pages-artifact@v1
        with:
          # this should match the `pages` option in your adapter-static options
          path: 'build/'


  deploy:
    needs: build_site
    runs-on: ubuntu-latest


    permissions:
      pages: write
      id-token: write


    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    
    steps:
      - name: Deploy
        id: deployment
        uses: actions/deploy-pages@v1
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