Some smoooooooth template literal types spotted in Vercel's Chat SDK Gives you automatically typed error codes for multiple features at once.
Matt Pocock
@mattpocock.com
Full-time TypeScript educator. Used to be a voice coach. He/him. Author of Total TypeScript 🧙 Hire me to teach your team TypeScript!
Damn, I really want to make a "UX Patterns For AI Applications" course All the hard stuff like stream resuming, generative UI, properly streaming markdown, editable plans, showing LLM progress
Hilarious use case for a mapped type: Use it to rename an object key your backend developers consistently misspell parms -> params
Spotted in the wild today: a Mutable<T> type. Does the opposite of Readonly<T>. Weird that TS doesn't have this built-in.
I've made a breakthrough today - come up with a new style of course that's ready for the AI-assisted developer era. It's just unbelievably cool, can't wait to show you.
Two cool things in this snippet: 1. You can use 'glob' from Node instead of a library! (still experimental, available in 22+) But glob returns an async iterator, which can be annoying to work with. So... 2. Array.fromAsync lets you turn an async iterator into an array. Beautiful.
Want to enter the world of AI, but don't know where to start? I've built a roadmap on how to become an AI Engineer. We cover: - What AI engineers are - What LLM's are used for - Evals - A directory of 17 techniques It's the perfect way to get ahead of the curve. www.aihero.dev/ai-engineer-...
AI Engineer Roadmap
Want to build AI-powered apps, but don't know where to start? You need a roadmap.
aihero.dev
"The AI Engineer Roadmap" dropping soon. Covering everything you need to enter the AI world: - What LLM's are used for - The AI engineer mindset - Evals - 17 techniques for improving your LLM-powered apps
This is unbelievably cool Just keep pressing 'space' to learn how an LLM works
LLM Visualization
A 3D animated visualization of an LLM with a walkthrough.
bbycroft.net
I have worked with TypeScript for 7 years. I have written a book, produced 5 courses, made countless videos and articles, and delivered workshops about TypeScript. And today I learned that TS can do this:
Trying to define an agentic loop in the fewest amount of words.
"In a world where folks are throwing LLMs at every problem, being able to sniff out when not to use them is a valuable skill."
When To Use LLM's, And When Not To
Discover when to use LLMs for data tasks like structuring and classification, and when to opt for deterministic systems.
aihero.dev
OK, Bluesky. Time for an early preview. (X hasn't seen this yet) I've shipped a 9-lesson tutorial on the Model Context Protocol - the USB-C of AI. It'll take you from "WTF is MCP" to shipping your own servers to the world. And, it's free. Check it out: www.aihero.dev/model-contex...
Model Context Protocol Tutorial
The Model Context Protocol is driving a new wave of innovation in the world of AI. In this tutorial, I'll break down everything you need to know to get started.
aihero.dev
Give me your favourite MCP client. Claude Code is fine. Cursor is OK. I want to branch out.
TypeScript announces rewrite to Go, with a 10x editor and CLI speedup. It's the biggest TS announcement I can remember. www.totaltypescript.com/typescript-a...
TypeScript Announces Go Rewrite, Achieves 10x Speedup
TypeScript announced a full rewrite of TypeScript in Go. In testing, this rewrite has achieved a 10x speedup in some repositories - and up to 15x in others.
totaltypescript.com
Here's how to build an MCP server with a single TypeScript file, and connect it to Claude Code. No build step. No bullshit. Totally transformative.
A Single-File MCP Server, In TypeScript
Set up an MCP server with a single TypeScript file; connect to Claude Code & run scripts seamlessly.
aihero.dev
Shower thought: The system prompt is the LLM's UI. In an agentic loop, elements of the system prompt have state, as well as props - lists of failed attempts, external data, exemplars. So, a React for system prompts makes sense.
Jina's open source DeepSearch implementation is fascinating, but SUPER hard to read. So, as a research project, I refactored the code to make the underlying logic clearer.
Has anyone written a JSX -> system prompt library? node-deepresearch would genuinely benefit so much from it. Endless string interpolation, impossible to grok what's going on. A proper component model for system prompts would be pretty convenient.
Folks who are building Deep Research, or Deep Research-type products... What do your evals look like? Do you e2e the entire system? Do you do any mocking? Do you eval individual parts of the system? (query rewriter, etc)
VSCode catching up with Cursor. Add this to get Cursor-like tab completions for suggesting the next edit.
One fascinating decision with building LLM integrations is Agent vs Workflow. Agent: give the LLM control of execution. Slower, but better at a wider range of things. Workflow: use code to control execution. Faster, but more specialised. Ultimately, it comes down to the product you're building.
Did some refactoring on Evalite (my evals runner for AI-powered apps) and made two big calls: - Commander -> stricli - Remix -> TanStack stricli is a gorgeous, TypeScript-first CLI library that just works. Easy to test, easy to run, and full type-safety for parameters and named flags
Looking to up my Cursor game. The feedback loop is extraordinary but the UI is strange. Drop me your best tips.