📢ArkType 2.2 is here. This is a big one, and it's long overdue. Validated functions, type-safe regex, bidirectional JSON Schema, and universal schema interop. Here's what's new 🧵

all you need to "learn" ArkType syntax: 1️⃣ start with a typescript keyword 2️⃣ .autocomplete to discover constraints 3️⃣ compose if needed with &, |, etc.

tools are just introspectable functions... what if you could define them like this?🤔

wish TS had rust-style pattern matching? (it already does)🪄

🚨Standard JSON Schema v1 just dropped🚨 🟢libraries can now accept ArkType wherever they need JSON Schema 🟢100% type-safe with inference built-in 🟢day one support from AI SDK 🟢TanStack AI and MCP SDK support imminent

🎉Announcing Standard JSON Schema🎉 The next spec in the Standard Schema family is here to bring library-agnostic JSON Schema to TS. Let's make sure everyone sees it🔁

Introducing ✨ Standard JSON Schema ✨ It's a sister spec to Standard Schema that provides a common interface for any entity that can be converted to JSON Schema

mission accomplished @mattpocock.com

the typescript ecosystem *desperately* needs type performance tooling. it's not an overstatement to say this is one of the biggest leaps in that area in the history of the language🙇

MichiganTypeScript@michigantypescript.com · 8mo ago

⚔️introducing TypeSlayer⚔️ A #typescript type performance benchmarking and analysis tool. A summation of everything learned from the benchmarking required to make the Doom project happen. It's got MCP support, Perfetto, Speedscope, Treemap, duplicate package detection, and more.

sounds fake but I'm starting a company with my nemesis Colin P. Zod and our first hire is @AndaristRake and our first product is now in beta

95% of ArkType syntax is just TypeScript. The other 5% are extensions like this that are... ✅composable ✅consistent across data types ✅100% safe with helpful type-level error messages

once you go type("string") you never go z.back()

iyky (you don't)

ArkType@arktype.io · 8mo ago

Difficulty of Parsing Regex with TypeScript Types ------------------------------------------------------------ group associativity ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ everything else ▒▒

In the next version of ArkType, any Standard Schema is a valid definition. Zod migration is about to get a whole lot easier🚀

fastest, cleanest tuple validation around

RIP z.shark() long live sharktype

use a wrapper

ArkType@arktype.io · 9mo ago

friends don't let friends have unsafe regex

agonized for a long time on syntax to return a regex's capture groups rather than just validating the input string... what do you think?

ArkType@arktype.io · 9mo ago

coming in ArkType 2.2... e(x)ec mode for regex literals🧑‍🍳

📈arkregex just hit 100k installs/week📈 if you're still using untyped RegExp() you may as well just write raw .js

string validation has never been this easy arktype🤝arkregex

problem: your RegExp is beyond human comprehension solution: pnpm i arkregex

I'll take "meticulously typed regex features you probably didn't know existed" for $500

in the latest version of arktype: regex properties and index signatures from arkregex🔒

imagine using untyped regex in 2025

arkregex is ridiculously optimized. even expressions like this are inferred instantly. but what about the most extreme cases?🧵

new RegExp(): ❌types 😴tired arkregex: ✅types 🫨wired

I am looking for a full-time job. Being independent in open source for 3.5+ years has been wonderful. I've gotten done most of the high-level goals I wanted to, and miss having people & structure around me. If you know of a role for a staff-level TypeScript+web developer, let me know! 🙂

hopefully this is not too insensitive

ArkType@arktype.io · 9mo ago

tHaNkS fOR 7k⭐

my abusive relationship with typescript's type system continues

ArkType@arktype.io · 9mo ago

📢Introducing ArkRegex📢 a drop in replacement for new RegExp() with types ⬇️

📢Introducing ArkRegex📢 a drop in replacement for new RegExp() with types ⬇️