# What's new in Svelte: September 2025 DevFeed: [What's new in Svelte: September 2025]() Original publisher: [Read original article]() Author: Dani Sandoval Published: 2025-09-01T00:00:00Z Content type: release Language: en Sources: [Svelte blog]() Topics: [telemetry]() Tags: [cli](), [instrumentation](), [mcp](), [observability](), [opentelemetry](), [release](), [svelte](), [traces]() ## AI overview A September 2025 Svelte release roundup covering Svelte, SvelteKit, and adapter updates, including OpenTelemetry tracing and observability setup, Deno package-manager support, CLI changes, and packaging behavior. It also highlights community projects and Svelte-related content. ## Source excerpt In case you missed it, the main Svelte blog covered how to use SvelteKit's new OpenTelemetry traces to reliably set up observability instrumentation using instrumentation.server.ts. This month's round up covers that release and a few other features that rolled out before and after it. Plenty in the showcase, as well, so let's dive in! What's new in Svelte and Svelte CLI (sv) await is now allowed inside @const declarations (svelte@5.38.0, Docs, #16542) The sv add command has been updated to remove the --no-preconditions and add --no-git-check. With this new flag, even if some files are dirty, no prompt will be shown (sv@0.9.0, Docs, #650) What's new in SvelteKit and its adapters Deno is now supported as a supported package manager (sveltejs/adapter-auto@6.1.0, #14163) A new instrumentation.server.ts adds tracing and observability setup (sveltejs/adapter-node@5.3.0, Docs, #13899) The --preserve-output flag prevents deletion of the output directory before packaging (sveltejs/package@2.5.0, Docs, #13055) For a full list of bug fixes in Svelte, SvelteKit and its adapters, check out their CHANGELOGs here and here. Community ShowcaseApps & Sites built with Svelte Pollinate provides accurate forecasts designed for allergy sufferers who want to plan their day, or vacation, around pollen levels (Check out the Reddit post on how it was built) Ferndesk is a help center that is kept up to date automatically (the creator shared their demo on the Svelte Reddit) Wplace lets you paint whatever you want on a map of the world Domain Watcher is a domain availability monitor and expiration tracker built with SvelteKit & Cloudflare Workers Motley is a local-first bookmarking/moodboard app TallyHo is a simple time tracking for freelancers MenuScan lets you take a picture of any restuarant menu and get access to the calorie and macro counts for each item Vibe Check provides quick, honest diagnostics for AI-built apps Joyful is a simple way to write, design, and send beautiful newsletters E