Stanislav
@khromov.se
🇸🇪 Web developer and obscure trivia enjoyer
🌱 Find me at https://stanislav.garden/
🔵 Starting over on Bluesky
🌱 Find me at https://stanislav.garden/
🔵 Starting over on Bluesky
If you are running projects on Next.js, you probably want to immediately upgrade them since a vulnerability with CVSS 10.0 (highest possible) was just disclosed in the RSC implementation, meaning the door is essentially wide open to hack your sites.
nextjs.org/blog/CVE-202...
nextjs.org/blog/CVE-202...
Security Advisory: CVE-2025-66478
A critical vulnerability (CVE-2025-66478) has been identified in the React Server Components protocol. Users should upgrade to patched versions immediately.
nextjs.org
December 3, 2025 at 9:59 PM
If you are running projects on Next.js, you probably want to immediately upgrade them since a vulnerability with CVSS 10.0 (highest possible) was just disclosed in the RSC implementation, meaning the door is essentially wide open to hack your sites.
nextjs.org/blog/CVE-202...
nextjs.org/blog/CVE-202...
Reposted by Stanislav
Guys I'm not making this up...I asked Claude, ChatGPT, Gemini and Grok what frontend framework they would pick if they only could pick the one they would enjoy writing more.
They ALL said Svelte 🧡
Do your LLM a favor, switch to Svelte 🧡
They ALL said Svelte 🧡
Do your LLM a favor, switch to Svelte 🧡
December 2, 2025 at 11:45 AM
Guys I'm not making this up...I asked Claude, ChatGPT, Gemini and Grok what frontend framework they would pick if they only could pick the one they would enjoy writing more.
They ALL said Svelte 🧡
Do your LLM a favor, switch to Svelte 🧡
They ALL said Svelte 🧡
Do your LLM a favor, switch to Svelte 🧡
A historic first today as Opus 4.5 scores 100% on SvelteBench - the first model to do so. We're hard at work on the next version of SvelteBench that will use an agentic approach, if you have feedback, submit it here: github.com/khromov/svel... #svelte #ai
November 25, 2025 at 9:45 AM
A historic first today as Opus 4.5 scores 100% on SvelteBench - the first model to do so. We're hard at work on the next version of SvelteBench that will use an agentic approach, if you have feedback, submit it here: github.com/khromov/svel... #svelte #ai
Reposted by Stanislav
pretty excited about this feature (thanks @ottomated.net!). dealing with file uploads can be a bit of a pain — the way it works normally is that you (or your framework) does `await request.formData()` to get a FormData object. but it has to buffer every file into memory first. that's a problem!
Streaming file uploads via a custom binary format just got merged into SvelteKit! In a follow up PR (github.com/sveltejs/kit...) upload progress will be handled too! github.com/sveltejs/kit...
Streaming file uploads · Issue #14773 · sveltejs/kit
Describe the problem When you submit a form, and JS is available, we POST a lightly-seasoned FormData object to the endpoint. Whenever you post form data with fetch, it defaults to multipart encodi...
github.com
November 21, 2025 at 1:51 PM
pretty excited about this feature (thanks @ottomated.net!). dealing with file uploads can be a bit of a pain — the way it works normally is that you (or your framework) does `await request.formData()` to get a FormData object. but it has to buffer every file into memory first. that's a problem!
🤖 Gemini 3.0 SvelteBench results are out! Gemini 2.5 was already great and 3.0 improves on the already excellent scores. All results at khromov.github.io/svelte-bench... #svelte #ai
November 19, 2025 at 9:45 AM
🤖 Gemini 3.0 SvelteBench results are out! Gemini 2.5 was already great and 3.0 improves on the already excellent scores. All results at khromov.github.io/svelte-bench... #svelte #ai
🎧 A couple of weeks ago I was a guest on the Svelte Radio podcast to talk about Svelte AI benchmarking and the brand new Svelte MCP server. Check it out in case you missed it! #svelte #javascript
www.youtube.com/watch?v=6PTJ...
www.youtube.com/watch?v=6PTJ...
Benchmarking AI with Stanislav Khromov
In this episode, Stanislav Khromov joins the Svelte Radio team to discuss his work on Svelte Bench, a
benchmarking tool that scientifically measures how well different LLMs understand and write…
www.youtube.com
November 10, 2025 at 9:45 AM
🎧 A couple of weeks ago I was a guest on the Svelte Radio podcast to talk about Svelte AI benchmarking and the brand new Svelte MCP server. Check it out in case you missed it! #svelte #javascript
www.youtube.com/watch?v=6PTJ...
www.youtube.com/watch?v=6PTJ...
If you're not tired of hearing about Svelte and AI I'm was recently on the Svelte Radio podcast!
🎙️ Just published a new episode of Svelte Radio: Benchmarking AI with Stanislav Khromov. Have a listen:
Benchmarking AI with Stanislav Khromov
In this episode, Stanislav Khromov joins the Svelte Radio team to...
www.svelteradio.com
October 30, 2025 at 6:50 PM
If you're not tired of hearing about Svelte and AI I'm was recently on the Svelte Radio podcast!
Reposted by Stanislav
Interested in hearing about Svelte and AI? Tomorrow we're releasing an episode of Svelte Radio with @khromov.se to talk about Svelte Bench and the new Svelte MCP server that was recently released.
We also talk about how LLMs always want to write React
Stay tuned!
We also talk about how LLMs always want to write React
Stay tuned!
October 29, 2025 at 6:59 PM
Interested in hearing about Svelte and AI? Tomorrow we're releasing an episode of Svelte Radio with @khromov.se to talk about Svelte Bench and the new Svelte MCP server that was recently released.
We also talk about how LLMs always want to write React
Stay tuned!
We also talk about how LLMs always want to write React
Stay tuned!
Next.js and RSC is (unfortunately) shown to be a poor abstraction over and over again. Really hope the React team changes course on the recent changes and goes back to simple, clear software.
How our "perfect" one-line isOwner() function in Next.js started always returning true.
Spoiler: It is because of server functions...
Wrote about the bug, the fix, and the "magic" that caused it:
marma.dev/articles/202...
#webdev #javascript #typescript #react #nextjs #serverfunctions
Spoiler: It is because of server functions...
Wrote about the bug, the fix, and the "magic" that caused it:
marma.dev/articles/202...
#webdev #javascript #typescript #react #nextjs #serverfunctions
marma.dev
October 26, 2025 at 10:37 PM
Next.js and RSC is (unfortunately) shown to be a poor abstraction over and over again. Really hope the React team changes course on the recent changes and goes back to simple, clear software.
Reposted by Stanislav
today we landed a @svelte.dev feature i'm pretty stoked about — we call it 'forking', and it lets you run state changes offscreen and later choose whether to commit them (e.g. user hovers on a link, preload data in case they click)
- docs svelte.dev/docs/svelte/...
- demo svelte.dev/playground/a...
- docs svelte.dev/docs/svelte/...
- demo svelte.dev/playground/a...
forking monkeys • Playground • Svelte
Web development for the rest of us
svelte.dev
October 25, 2025 at 7:11 PM
today we landed a @svelte.dev feature i'm pretty stoked about — we call it 'forking', and it lets you run state changes offscreen and later choose whether to commit them (e.g. user hovers on a link, preload data in case they click)
- docs svelte.dev/docs/svelte/...
- demo svelte.dev/playground/a...
- docs svelte.dev/docs/svelte/...
- demo svelte.dev/playground/a...
Reposted by Stanislav
i rewrote a popular next.js site in svelte. LOC before/after: 1/5th* of the code. <3 svelte
(this is a follow upon my previous post bsky.app/profile/nuqa...)
* 1/5th and not 1/6.7th since there are a few more features to add to svelte version
(this is a follow upon my previous post bsky.app/profile/nuqa...)
* 1/5th and not 1/6.7th since there are a few more features to add to svelte version
October 25, 2025 at 8:41 AM
i rewrote a popular next.js site in svelte. LOC before/after: 1/5th* of the code. <3 svelte
(this is a follow upon my previous post bsky.app/profile/nuqa...)
* 1/5th and not 1/6.7th since there are a few more features to add to svelte version
(this is a follow upon my previous post bsky.app/profile/nuqa...)
* 1/5th and not 1/6.7th since there are a few more features to add to svelte version
Reposted by Stanislav
I curse at Claude Sonnet and Google's Codex a lot, but damn, Haiku on component level hits different. The velocity enables a nice feedback loop / iteration pace. And the Svelte MCP's autofixer add final touches. What a gift from @paolo.ricciuti.me and @khromov.se!
svelte.dev/docs/mcp/ove...
svelte.dev/docs/mcp/ove...
October 22, 2025 at 10:31 PM
I curse at Claude Sonnet and Google's Codex a lot, but damn, Haiku on component level hits different. The velocity enables a nice feedback loop / iteration pace. And the Svelte MCP's autofixer add final touches. What a gift from @paolo.ricciuti.me and @khromov.se!
svelte.dev/docs/mcp/ove...
svelte.dev/docs/mcp/ove...
Reposted by Stanislav
The Svelte MCP now uses `mcp-ui` to show you the playground directly in your chat with `playground-link`. This means you don't have to wait for the big playground link to play with the generated code!
Currently, not many clients supports it, but VS Code should soon, and you can try it in Postman 👀
Currently, not many clients supports it, but VS Code should soon, and you can try it in Postman 👀
October 22, 2025 at 3:36 PM
The Svelte MCP now uses `mcp-ui` to show you the playground directly in your chat with `playground-link`. This means you don't have to wait for the big playground link to play with the generated code!
Currently, not many clients supports it, but VS Code should soon, and you can try it in Postman 👀
Currently, not many clients supports it, but VS Code should soon, and you can try it in Postman 👀
The official Svelte MCP server got a mention in the latest Fireship video! (1:58)
Many cool features coming soon so try it out if you haven't! #svelte #ai
www.youtube.com/watch?v=PLKr...
Many cool features coming soon so try it out if you haven't! #svelte #ai
www.youtube.com/watch?v=PLKr...
How to make vibe coding not suck…
Deploy your app the easy way with Sevalla and get $50 in free credits - https://sevalla.com/fireship
AI coding may be overhyped but Model Context Protocols are making it possible for experienced…
www.youtube.com
October 15, 2025 at 8:45 AM
The official Svelte MCP server got a mention in the latest Fireship video! (1:58)
Many cool features coming soon so try it out if you haven't! #svelte #ai
www.youtube.com/watch?v=PLKr...
Many cool features coming soon so try it out if you haven't! #svelte #ai
www.youtube.com/watch?v=PLKr...
Reposted by Stanislav
I made a SvelteKit remote functions tutorial!
Learn how to work with data in SvelteKit from fetching data to guarding routes and optimistic UI updates.
Follow along with me as we build Svelte Tricks — a CRUD app using Better Auth and Drizzle ORM.
youtu.be/Ldnmirx0QtI
Learn how to work with data in SvelteKit from fetching data to guarding routes and optimistic UI updates.
Follow along with me as we build Svelte Tricks — a CRUD app using Better Auth and Drizzle ORM.
youtu.be/Ldnmirx0QtI
Learn SvelteKit Remote Functions Tutorial
YouTube video by Joy of Code
youtu.be
October 12, 2025 at 2:20 PM
I made a SvelteKit remote functions tutorial!
Learn how to work with data in SvelteKit from fetching data to guarding routes and optimistic UI updates.
Follow along with me as we build Svelte Tricks — a CRUD app using Better Auth and Drizzle ORM.
youtu.be/Ldnmirx0QtI
Learn how to work with data in SvelteKit from fetching data to guarding routes and optimistic UI updates.
Follow along with me as we build Svelte Tricks — a CRUD app using Better Auth and Drizzle ORM.
youtu.be/Ldnmirx0QtI
Reposted by Stanislav
It's happening! Let us know if you're interested in sponsoring!
As we're nearing the launch of the Svelte Society website (~2-3 weeks out) - I'm starting to look for sponsors. Does your company use Svelte? Do you want to show up as a sponsor on the website? Reach out!
October 9, 2025 at 7:28 PM
It's happening! Let us know if you're interested in sponsoring!
Reposted by Stanislav
The cat is out of the box! If you use AI the official MCP is a must have. Try it out and if there's something that the AI still gets wrong please open an issue on
github.com/sveltejs/mcp...
And btw... it's obviously open source (using TMCP 🤟🏻)
github.com/sveltejs/mcp
Let us know how it goes! 🧡
github.com/sveltejs/mcp...
And btw... it's obviously open source (using TMCP 🤟🏻)
github.com/sveltejs/mcp
Let us know how it goes! 🧡
October 4, 2025 at 12:30 PM
The cat is out of the box! If you use AI the official MCP is a must have. Try it out and if there's something that the AI still gets wrong please open an issue on
github.com/sveltejs/mcp...
And btw... it's obviously open source (using TMCP 🤟🏻)
github.com/sveltejs/mcp
Let us know how it goes! 🧡
github.com/sveltejs/mcp...
And btw... it's obviously open source (using TMCP 🤟🏻)
github.com/sveltejs/mcp
Let us know how it goes! 🧡
Reposted by Stanislav
lil' treat for all you weekend builders: Svelte now has an official MCP server, courtesy of resident bot wranglers @paolo.ricciuti.me and @khromov.se 🤖
it gives your LLM access to docs and compiler-driven diagnostics — give it a spin and let us know how you get on!
svelte.dev/docs/mcp/ove...
it gives your LLM access to docs and compiler-driven diagnostics — give it a spin and let us know how you get on!
svelte.dev/docs/mcp/ove...
Overview • Docs • Svelte
Overview • Svelte documentation
svelte.dev
October 4, 2025 at 12:15 PM
lil' treat for all you weekend builders: Svelte now has an official MCP server, courtesy of resident bot wranglers @paolo.ricciuti.me and @khromov.se 🤖
it gives your LLM access to docs and compiler-driven diagnostics — give it a spin and let us know how you get on!
svelte.dev/docs/mcp/ove...
it gives your LLM access to docs and compiler-driven diagnostics — give it a spin and let us know how you get on!
svelte.dev/docs/mcp/ove...
🔥 Before and after SvelteKit Remote Functions!
(by Snaæk in the official Svelte Discord - join us at discord.com/invite/svelte )
#svelte #sveltekit #javascript
(by Snaæk in the official Svelte Discord - join us at discord.com/invite/svelte )
#svelte #sveltekit #javascript
October 4, 2025 at 8:45 AM
🔥 Before and after SvelteKit Remote Functions!
(by Snaæk in the official Svelte Discord - join us at discord.com/invite/svelte )
#svelte #sveltekit #javascript
(by Snaæk in the official Svelte Discord - join us at discord.com/invite/svelte )
#svelte #sveltekit #javascript
It's not every day you see the Swedish central bank's website at the top of Hacker News! 🇸🇪 🫎
October 3, 2025 at 11:14 PM
It's not every day you see the Swedish central bank's website at the top of Hacker News! 🇸🇪 🫎
Reposted by Stanislav
svelte.dev/packages is now live!
It's a convenient and easily discoverable place to find a sampling of high quality packages in the ecosystem. We hope it will give confidence in the Svelte ecosystem to newcomers and help them get started more easily.
It's a convenient and easily discoverable place to find a sampling of high quality packages in the ecosystem. We hope it will give confidence in the Svelte ecosystem to newcomers and help them get started more easily.
Packages • Svelte
Packages for your Svelte and SvelteKit apps
svelte.dev
October 2, 2025 at 5:01 PM
svelte.dev/packages is now live!
It's a convenient and easily discoverable place to find a sampling of high quality packages in the ecosystem. We hope it will give confidence in the Svelte ecosystem to newcomers and help them get started more easily.
It's a convenient and easily discoverable place to find a sampling of high quality packages in the ecosystem. We hope it will give confidence in the Svelte ecosystem to newcomers and help them get started more easily.
👀 Open weights LLMs are catching up to commercial models in their Svelte 5 skills! Kimi K2, DeepSeek v3.2 and GLM-4.6 are in 4th, 5th and 6th place, far surpassing closed models by OpenAI and Google! #ai #svelte
All results at khromov.se/svelte-bench
All results at khromov.se/svelte-bench
October 1, 2025 at 8:45 AM
👀 Open weights LLMs are catching up to commercial models in their Svelte 5 skills! Kimi K2, DeepSeek v3.2 and GLM-4.6 are in 4th, 5th and 6th place, far surpassing closed models by OpenAI and Google! #ai #svelte
All results at khromov.se/svelte-bench
All results at khromov.se/svelte-bench