Weird error description when pre-rendering

[alexbjorlig]

Hi there.

I'm running the latest version of Sveltekit (v582). I can build my app locally on my machine, but when I push to Github actions I get this error message on build:

Error: ENOENT: no such file or directory, open '/home/runner/work/eddystone/eddystone/apps/web-app/.svelte-kit/generated/prerendered.json'
web-app:build:     at Object.openSync (node:fs:590:3)
web-app:build:     at Object.readFileSync (node:fs:458:35)
web-app:build:     at ChildProcess.<anonymous> (file:///home/runner/work/eddystone/eddystone/node_modules/@sveltejs/kit/src/exports/vite/index.js:478:38)
web-app:build:     at ChildProcess.emit (node:events:513:28)
web-app:build:     at Process.ChildProcess._handle.onexit (node:internal/child_process:293:12) {
web-app:build:   errno: -2,
web-app:build:   syscall: 'open',
web-app:build:   code: 'ENOENT',
web-app:build:   path: '/home/runner/work/eddystone/eddystone/apps/web-app/.svelte-kit/generated/prerendered.json'
web-app:build: }

Any hints for what I could try - what is prerendered.json?

solved
Turns out that my server could not start for prerendering in CI - a better error message would be nice - but it works now.

[danielzting]

I'm having the same issue in GitLab, how did you end up fixing this?

[danielzting]

Turned out SvelteKit was somehow trying to run my database connection code when prerendering (I use Prisma). Despite setting prerendered = false in the root layout and entries = [] in svelte.config.js, the prerendering process was still trying to run for some reason.

I finally got around this by not connecting if the code is being run in the context of a build. (Still not sure why building my app actually runs my code.)

import { PrismaClient } from '@prisma/client';
import { building } from '$app/environment';

const prisma = new PrismaClient();
if (!building) {
	await prisma.$connect();
}
export default prisma;

[geoffrich]

See the docs - SvelteKit needs to load your routing files at buildtime to determine which page options are set

[danielzting]

You know what they say, "a few hours of trial and error can save you several minutes of looking at the README"

Thanks 🤡

[geoffrich]

To be fair, this doc was added yesterday!