[IDEA] - incremental ssg

[dgrebb]

this is the way...

sveltejs/kit#2369 (comment)

As mentioned in #2369 (comment), config.kit.prerender.entries (alongside crawl: false) is the solution to this problem. You can put something like this in your svelte.config.js...

// svelte.config.js
import adapter from '@sveltejs/adapter-static';

export default {
  kit: {
    prerender: {
      entries: process.argv.length > 3 ? process.argv.slice(3) : ['*'],
      crawl: process.argv.length <= 3
    }
  }
};

...then do

npm run build

to prerender everything, or

npm run build -- /an-article-i-want-to-update /another-article-i-want-to-update

to update /an-article-i-want-to-update and /another-article-i-want-to-update. Or, if you have some programmatic way of determining which URLs have changed, you can put that logic in your config file instead. We could add a new argument to svelte-kit build, but it would only be marginally more convenient than what's already possible in userland, and it wouldn't help in the programmatic case.

Of course, if you're using a hosted CI service then you need to be able to access the previously built pages somehow — there's nothing SvelteKit can do to help with that.

A better solution to all this would be to have some form of incremental static regeneration (#661), but that's a post-1.0 TODO.