Artem Kobzar 🇺🇦

Leading Kotlin/JS at @JetBrains, @TC39 Delegate

[Artem Kobzar 🇺🇦 @rage_monk]

Quite exciting updates about Kotlin for Web.

[Kotlin by JetBrains @kotlin]

🚀 We've been focused on enhancing Kotlin Multiplatform for web, and a lot has been going on behind the scenes. 🛠️ Now, we're ready to share it – check out our latest update on the present and future of Kotlin for web. 🌐
https://t.co/i8H9sqKCUi

[Rob Palmer @robpalmer2]

Jarred experiments with multi-threaded JavaScript 🧪

@filpizlo's "wild thought experiment" is from 2017 is brought to life 🔥

Unlike existing approaches (workers, SharedArrayBuffer) this shares the JS heap. It means threads directly access the same JS objects.

[Oliver Medhurst @CanadaHonk]

experiment

[Paul Miller @paulmillr]

> WASM, but paranoia-friendly

Announcing 3 new projects:

1. awasm: a new standard for auditable, high-security WASM packages
2. awasm-compiler: an auditable js-to-wasm compiler
3. awasm-noble: an ultra-fast WASM cryptography library (ChaCha/BLAKE3 at 6-10 GB/s)

[Steren @steren]

Wow, it actually *is* DOM
(See me using Chrome DevTools to inspect the DOM)

HTML is <canvas> is going to open a new era of web UIs

[Márton Braun (write-only account) @zsmb13]

Well, that's all folks! It's been a blast seeing so many of you at KotlinConf again this year, and I hope y'all enjoyed the show.

We'll be seeing you again next year, wherever Kodee takes us!

[Rob Palmer @robpalmer2]

ECMAScript excitement 😉

This week @TC39 met at @jetbrains Amsterdam & moved these proposals:

4️⃣ Atomics.pause()
4️⃣ Explicit Resource Management
4️⃣ Joint Iteration
3️⃣ Error stack accessor
3️⃣ Intl Keep Trailing Zeros
3️⃣ Iterator Chunking
3️⃣ Iterator Includes
3️⃣ Iterator Join

🧵

[Sunil Kumar @sunildhiman90]

Official #Kotlin support for #VisualStudioCode is now available in alpha. #KotlinConf26

[John O'Reilly @joreilly]

New Kotlin Toolchain announced (currently in alpha) #kotlinconf2026

[John O'Reilly @joreilly]

Google's support for KMP continues to expand #kotlinconf26

[Rob Palmer @robpalmer2]

ECMAScript excitement 😉

Congrats to @rbuckton on meeting the conditions for Explicit Resource Management to be Stage 4 at @TC39 today 🎉

It introduces `using` declarations and the Symbol.dispose protocol to deterministically and ergonomically release resources 👍

[Rob Palmer @robpalmer2]

ECMAScript excitement 😉

Congrats to @smooshMap on advancing Joint Iteration to Stage 4 at TC39 today 🎉

It provides synchronized iteration over multiple iterators.

🔸 https://t.co/2zSc2BfE4Q vends an array per-iteration
🔸 Iterator.zipToObjects vends an object per-iteration

[Rob Palmer @robpalmer2]

Deno is about to be the first runtime to ship @TC39 Stage 3 "import defer" 🎉

It is a performance-boosting ESM feature that allows static imports to evaluate lazily.

https://t.co/kpEAxIfcSk

[Luke Edwards @lukeed05]

In celebration of @rolldown_rs 1.0 🎉

Announcing `comptime` — a Zig-inspired build-time evaluation primitive, exposed as Vite and Rolldown plugins

This allows you run code at build time, replacing the call site(s) with the evaluated output value.

https://t.co/myKeJMvDBP

[Kotlin by JetBrains @kotlin]

In case you missed it:

🚀 The first alpha of Room 3.0

The build focuses on Kotlin Multiplatform and expands support to JavaScript and Wasm.

It is Kotlin-first and built around coroutines, making it easier to share your data layer across platforms today. 👇 https://t.co/ByEJE3iJFt

[Rob Palmer @robpalmer2]

Source maps are more exciting than ever 😉

🔶 Recently standardized! (one year ago)
🔶 An active @TC39 Task Group
🔶 New features imminent: Scopes & Range Maps

Read all about it 👇

[Rob Palmer @robpalmer2]

TypeScript 6.0 is out 🎉

🔶 Temporal
🔶 Map#getOrInsert
🔶 RegExp.escape
🔶 #/ prefix for Package Imports

New defaults!
🔶 target: ES2025
🔷 --strict

Deprecations!
🗑️ baseUrl, outFile
🗑️ import assertions
🗑️ `module` namespace
🗑️ moduleResolution: node
🗑️ target: ES5

[Matteo Collina @matteocollina]

.@nodejs has always been about I/O. Streams, buffers, sockets, files. But there's a gap that has bugged me for years: you can't virtualize the filesystem.

You can't import a module that only exists in memory. You can't bundle assets into a Single Executable without patching half the standard library.

That changes now 👇

[James Hartig @jameshartig]

Temporal: The 9-Year Journey to Fix Time in JavaScript https://t.co/uhOCanxho0

[Rob Palmer @robpalmer2]

ECMAScript EXTRA-SPECIAL excitement 😉

🚨🚨🚨 IT'S ABOUT TIME! 🚨🚨🚨

Congrats to @therealptomato on advancing Temporal to Stage 4 at @TC39 today 🎉

Temporal is the replacement for the JavaScript Date API 👍

[Jon Kuperman @jkup]

Source maps are a vital part of modern web development, but the lack of a standard made it impossible to add new features or improve the debugging experience.

This is the story of how we standardized source maps and how we continue to ship features through standards 📜

🧵