Matt Rossman
@mattrossman.com
AI Tooling @supabase.com
Writing: mattrossman.com
I build web applications with emerging tech.
Geeked about @effect-ts.bsky.social
Writing: mattrossman.com
I build web applications with emerging tech.
Geeked about @effect-ts.bsky.social
Supabase laptop looking fresh
September 11, 2025 at 9:29 PM
Supabase laptop looking fresh
Reposted by Matt Rossman
Supabase Select brings together the top builders in the industry
Join Guillermo Rauch, CEO and Founder of @vercel.com speaking in Track 1
Apply today: select.supabase.com
Join Guillermo Rauch, CEO and Founder of @vercel.com speaking in Track 1
Apply today: select.supabase.com
September 2, 2025 at 7:10 PM
Supabase Select brings together the top builders in the industry
Join Guillermo Rauch, CEO and Founder of @vercel.com speaking in Track 1
Apply today: select.supabase.com
Join Guillermo Rauch, CEO and Founder of @vercel.com speaking in Track 1
Apply today: select.supabase.com
Delighted to share that I’ve joined @supabase.com to work on AI tools!
Open source has taught me so much, so it’s a privilege to now contribute full-time in this space. Excited to help make this excellent developer platform even better!
Open source has taught me so much, so it’s a privilege to now contribute full-time in this space. Excited to help make this excellent developer platform even better!
August 13, 2025 at 10:10 PM
Delighted to share that I’ve joined @supabase.com to work on AI tools!
Open source has taught me so much, so it’s a privilege to now contribute full-time in this space. Excited to help make this excellent developer platform even better!
Open source has taught me so much, so it’s a privilege to now contribute full-time in this space. Excited to help make this excellent developer platform even better!
Reposted by Matt Rossman
We're really proud to show off the final design for Pebble Time 2*! It's quite a bit sleeker and imo more awesome looking than the original design for Core Time 2 we showed off in March. I hope you like it!
August 13, 2025 at 12:59 PM
We're really proud to show off the final design for Pebble Time 2*! It's quite a bit sleeker and imo more awesome looking than the original design for Core Time 2 we showed off in March. I hope you like it!
Reposted by Matt Rossman
My Voices of VR interview is out! I spoke to @kentbye.com at @awexr.com about my game, WebXR broadly, and publishing on @viverse.com. I'm a huge fan of this podcast b/c of Kent's journalistic objectivity and ethics, but also his genuine enthusiasm and deep experience
voicesofvr.com/1615-viverse...
voicesofvr.com/1615-viverse...
#1615: Viverse’s WebXR Publishing Strategy with James C. Kane & “In Tirol” Game – Voices of VR Podcast
voicesofvr.com
August 6, 2025 at 3:26 PM
My Voices of VR interview is out! I spoke to @kentbye.com at @awexr.com about my game, WebXR broadly, and publishing on @viverse.com. I'm a huge fan of this podcast b/c of Kent's journalistic objectivity and ethics, but also his genuine enthusiasm and deep experience
voicesofvr.com/1615-viverse...
voicesofvr.com/1615-viverse...
Reposted by Matt Rossman
ECMAScript excitement 😉
Congrats to @bakkot.com on advancing UInt8Array ↔️ Base64/Hex to Stage 4 at TC39 this week 🎉
UInt8Array.prototype.
toBase64
toHex
UInt8Array.
fromBase64
fromHex
It lets you convert directly between binary data and Base64/Hex strings 👍
Congrats to @bakkot.com on advancing UInt8Array ↔️ Base64/Hex to Stage 4 at TC39 this week 🎉
UInt8Array.prototype.
toBase64
toHex
UInt8Array.
fromBase64
fromHex
It lets you convert directly between binary data and Base64/Hex strings 👍
![let arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
console.log(arr.toBase64());
// 'SGVsbG8gV29ybGQ='
console.log(arr.toHex());
// '48656c6c6f20576f726c64'
let string = 'SGVsbG8gV29ybGQ=';
console.log(Uint8Array.fromBase64(string));
// Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100])
string = '48656c6c6f20576f726c64';
console.log(Uint8Array.fromHex(string));
// Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100])](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:w227epg3attqnssfdkx6ex6a/bafkreihrq4aegp6a5gtlqnkcox5w6eblthyvnz66w6gf53mvuh4fsr3254@jpeg)
July 30, 2025 at 6:56 AM
ECMAScript excitement 😉
Congrats to @bakkot.com on advancing UInt8Array ↔️ Base64/Hex to Stage 4 at TC39 this week 🎉
UInt8Array.prototype.
toBase64
toHex
UInt8Array.
fromBase64
fromHex
It lets you convert directly between binary data and Base64/Hex strings 👍
Congrats to @bakkot.com on advancing UInt8Array ↔️ Base64/Hex to Stage 4 at TC39 this week 🎉
UInt8Array.prototype.
toBase64
toHex
UInt8Array.
fromBase64
fromHex
It lets you convert directly between binary data and Base64/Hex strings 👍
Reposted by Matt Rossman
Exporting video with correct colors from #DaVinciResolve is unexpectedly difficult... Something that looks great in editor looks maddeningly "off" in different viewers. I have a lot respect for creators who have mastered this!
www.youtube.com/watch?v=1Qln...
www.youtube.com/watch?v=1Qln...
Quicktime Color Management: why so many ISSUES?!
YouTube video by LE LABO DE JAY
www.youtube.com
July 1, 2025 at 12:32 AM
Exporting video with correct colors from #DaVinciResolve is unexpectedly difficult... Something that looks great in editor looks maddeningly "off" in different viewers. I have a lot respect for creators who have mastered this!
www.youtube.com/watch?v=1Qln...
www.youtube.com/watch?v=1Qln...
Reposted by Matt Rossman
I wrote about why I'm tired of reading about takes on quality. ericwbailey.website/published/qu...
Quality is a trap
It is a proxy phrase, often born of an inability or unwillingness to articulate other concerns.
ericwbailey.website
June 25, 2025 at 2:07 PM
I wrote about why I'm tired of reading about takes on quality. ericwbailey.website/published/qu...
Updated my project template dashboard new.mattrossman.com to a more space-efficient masonry layout with the help of `astro-masonry`
June 25, 2025 at 3:23 PM
Updated my project template dashboard new.mattrossman.com to a more space-efficient masonry layout with the help of `astro-masonry`
Early builds of a rewritten SpotMenu (Spotify controls for Mac menu bar) are popping up in this thread, looking nice 👀
github.com/kmikiy/SpotM...
github.com/kmikiy/SpotM...
June 25, 2025 at 4:50 AM
Early builds of a rewritten SpotMenu (Spotify controls for Mac menu bar) are popping up in this thread, looking nice 👀
github.com/kmikiy/SpotM...
github.com/kmikiy/SpotM...
TIL about ::part() for letting web component consumers more easily style elements within the shadow DOM
::part() - CSS | MDN
The ::part CSS pseudo-element represents any element within a shadow tree that has a matching part attribute.
developer.mozilla.org
June 24, 2025 at 6:22 PM
TIL about ::part() for letting web component consumers more easily style elements within the shadow DOM
Reposted by Matt Rossman
On device voice assistant running on my Mac Mini w/Ollama and Home Assistant: mattcool.tech/posts/home-a...
June 18, 2025 at 2:40 PM
On device voice assistant running on my Mac Mini w/Ollama and Home Assistant: mattcool.tech/posts/home-a...
The @vercel.com MCP adapter works with @val.town HTTP triggers (for streamable HTTP at least) meaning you can write and deploy MCP servers with TypeScript instantly, right in your browser!
June 14, 2025 at 12:53 AM
The @vercel.com MCP adapter works with @val.town HTTP triggers (for streamable HTTP at least) meaning you can write and deploy MCP servers with TypeScript instantly, right in your browser!
Reposted by Matt Rossman
Spotted on the changelog for Deno Deploy EA...
Playgrounds!
- Create and edit playgrounds
- Multi-file playground support
- Playground templates and settings
docs.deno.com/deploy/early...
Playgrounds!
- Create and edit playgrounds
- Multi-file playground support
- Playground templates and settings
docs.deno.com/deploy/early...
June 12, 2025 at 3:30 PM
Spotted on the changelog for Deno Deploy EA...
Playgrounds!
- Create and edit playgrounds
- Multi-file playground support
- Playground templates and settings
docs.deno.com/deploy/early...
Playgrounds!
- Create and edit playgrounds
- Multi-file playground support
- Playground templates and settings
docs.deno.com/deploy/early...
When testing @pipecat.bsky.social examples with their prebuilt UI, you can manually submit user messages (or trigger other behavior of your choice) through the browser console via app messages by including a handler like this.
!["""
Usage in browser console:
webRTCApp.smallWebRTCTransport.sendMessage({
type: "user_content",
content: "What's the weather in SF?"
})
"""
@transport.event_handler("on_app_message")
async def on_app_message(transport, message: dict):
match message:
case {"type": "user_content", "content": content}:
await task.queue_frames(
[
LLMMessagesAppendFrame([{"role": "user", "content": content}]),
context_aggregator.user().get_context_frame(),
]
)](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:3hw5r376cu7qx25ng5rozuyu/bafkreidfrccp2cyu4peh7akveeqhfy4v6jcmod7vob6ucr6ktac22lv45q@jpeg)
June 11, 2025 at 4:09 PM
When testing @pipecat.bsky.social examples with their prebuilt UI, you can manually submit user messages (or trigger other behavior of your choice) through the browser console via app messages by including a handler like this.
I use a $35 HP T620 Thin Client as my home server. I measured its energy usage over the past couple of months to assess how much it costs me to run a lightweight always-on server with #HomeAssistant and media management software (around $0.08/day).
Cost of running a thin client home server
mattrossman.com
June 10, 2025 at 5:08 PM
I use a $35 HP T620 Thin Client as my home server. I measured its energy usage over the past couple of months to assess how much it costs me to run a lightweight always-on server with #HomeAssistant and media management software (around $0.08/day).
Sometimes I want to interrupt an async function that doesn't support abort signals. In situations without side-effects, here's a wrapper to abort a promise and lazily discard its result. I generally prefer safer interruption patterns (as in #Effect-TS) but it's handy in a pinch.
Naive promise interruption
mattrossman.com
June 9, 2025 at 12:19 PM
Sometimes I want to interrupt an async function that doesn't support abort signals. In situations without side-effects, here's a wrapper to abort a promise and lazily discard its result. I generally prefer safer interruption patterns (as in #Effect-TS) but it's handy in a pinch.
Balatro Calculator
Calculate the score of any Balatro hand
efhiii.github.io
June 1, 2025 at 12:00 PM
I like to put `ignore/` in .gitignore for most projects I work on.
When I want to create an untracked file (e.g. private notes, large static asset for dev) I can toss it in an `ignore/` folder anywhere. Wish something like this came in more starter templates! #git
When I want to create an untracked file (e.g. private notes, large static asset for dev) I can toss it in an `ignore/` folder anywhere. Wish something like this came in more starter templates! #git
May 20, 2025 at 8:06 PM
I like to put `ignore/` in .gitignore for most projects I work on.
When I want to create an untracked file (e.g. private notes, large static asset for dev) I can toss it in an `ignore/` folder anywhere. Wish something like this came in more starter templates! #git
When I want to create an untracked file (e.g. private notes, large static asset for dev) I can toss it in an `ignore/` folder anywhere. Wish something like this came in more starter templates! #git
I was going nuts trying to figure out why Cloudflare logs for my MCP server were showing requests every 5 minutes from my location. Turns out Claude Desktop was the culprit, even though I closed the app and removed the MCP server config it left an `mcp-remote` process running in the background 🙃
May 17, 2025 at 10:51 PM
I was going nuts trying to figure out why Cloudflare logs for my MCP server were showing requests every 5 minutes from my location. Turns out Claude Desktop was the culprit, even though I closed the app and removed the MCP server config it left an `mcp-remote` process running in the background 🙃
I want to upgrade my @home-assistant.io install soon to play around with their latest assistant features and MCP integration.
www.home-assistant.io/integrations...
www.home-assistant.io/integrations...
Model Context Protocol
Instructions on how to use the Model Context Protocol with Home Assistant.
www.home-assistant.io
May 8, 2025 at 10:38 PM
I want to upgrade my @home-assistant.io install soon to play around with their latest assistant features and MCP integration.
www.home-assistant.io/integrations...
www.home-assistant.io/integrations...
If you use moonrepo.dev/proto to manage Node versions and face `EOENT` / `EPIPE` errors when configuring local MCP servers in Claude desktop, here's a solution that worked for me:
github.com/modelcontext...
github.com/modelcontext...
May 6, 2025 at 11:13 PM
If you use moonrepo.dev/proto to manage Node versions and face `EOENT` / `EPIPE` errors when configuring local MCP servers in Claude desktop, here's a solution that worked for me:
github.com/modelcontext...
github.com/modelcontext...
Building an MCP server with @cloudflare-dev.bsky.social agents SDK. It's an interesting mental shift writing an API where do you don't have to worry so much about the shape of your response. E.g. for a Bluesky tool I can neatly format feed data or dump it as-is, the model makes sense of it.
May 6, 2025 at 2:37 AM
Building an MCP server with @cloudflare-dev.bsky.social agents SDK. It's an interesting mental shift writing an API where do you don't have to worry so much about the shape of your response. E.g. for a Bluesky tool I can neatly format feed data or dump it as-is, the model makes sense of it.