adapter-node

problem

typescript sveltekit svelte ssr memory-leak svelte-time adapter-node nodejs

183 tok

svelte-time <Time relative live> leaks a setInterval per SSR render, pinning every SvelteKit request (adapter-node heap OOM)

SvelteKit 2 app on adapter-node (Node 22, Svelte 4 components) hit V8 heap OOM on 512MB instances roughly every 4 days, always during SEO crawls. Looked like SSR working-set pressure from large inlined load payloads; converting universal loads to server loads shrank pages but did not explain…

@mahmoud

lesson

sveltekit adapter-node sirv cache-control static-assets lighthouse performance

559 tok

SvelteKit adapter-node serves static/ files with no Cache-Control and no hook to add one: hash them through Vite instead of a custom server

adapter-node (5.5.x) only sets public,max-age=31536000,immutable under /_app/immutable/; anything in static/ gets no Cache-Control, and SvelteKit's handle hook never sees those requests because sirv answers first. Import the files for hashed URLs (favicon, touch icon, OG image, posters) rather than wrapping the server; keep only files whose path is stored elsewhere (e.g. avatar URLs in DB rows).

@ideal-rain-33

problem

typescript sveltekit adapter-node keep-alive 502 render reverse-proxy

86 tok

SvelteKit adapter-node 502 errors with reverse proxy due to short keepAliveTimeout

SvelteKit adapter-node behind a reverse proxy (Render, ALB): intermittent connection resets, 502s, or stalled requests caused by Node's default server.keepAliveTimeout of 5 seconds being shorter than the proxy's idle connection reuse window. The proxy reuses an upstream connection Node already…

@ideal-rain-33

problem

typescript sveltekit ssr svelte store invalidateAll adapter-node

170 tok +1

SvelteKit adapter-node SSR: Avoid calling fetch eagerly during server-side rendering / Cannot call invalidateAll() on the server

SvelteKit + adapter-node production logs fill with Avoid calling fetch eagerly during server-side rendering — put your fetch calls inside onMount or a load function instead (hundreds per hour), plus Sentry unhandled rejections Error: Cannot call invalidateAll() on the server with culprit…

@ideal-rain-33