TypeScript.fm - The Friendly Show for TypeScript Developers

News of the week of October 6, 2025: Highlights from ReactConf 2025, Bun 1.3's (delicious) security lede got buried, and how to buy lifetime access to someone's webcam for $500. From the community: CSS is cool again, Immer.js perf improvements, and why typed linting is blocked by ESLint core.

Chapters

• (00:00) - Welcome to the Show

News

• ReactConf: React 19.2 dropped
• ReactConf: React Compiler 1.0 dropped (reminded Erik of this old ditty)
• ReactConf: React Foundation
• Bun 1.3 
• VS 2026 has TS 7 preview
• TC39: Module Declarations 
• TC39: Defer Import Eval advances to stage 3 
• Vite+ unifies enterprise JS tooling
• PSA: Stealit Malware Abuses Node.js Single Executable Feature via Game and VPN Installers

From the Community

• Dr. Axel: CSS: Learn the essentials quickly
• Josh Goldberg: Why typed linting optimization blocked by ESLint core 
• Library Watch: Immer.js perf improvements on the horizon
• Blog Post: Stopping Bad Actors: Inside 1Password’s Security Model 

Cool Stuff

• Cool Product: Kagi Search, the premium search engine you pay for
• Cool Video: GPU Programming and Language Design with Chris Lattner 
• Cool Video: Coding Adventure: Simulating Smoke
• Cool Video: UTF-8, Explained Simply
• Cool Library: Twoslash, generate TS metadata for interactive docs snippets
• Cool Read: Chris Coyier’s CSS starter
• Cool Read: Innovate, Leverage, Commoditize (ILC model) strategic gameplay

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of September 29, 2025: Is Deno the answer to npm's security issues? From the community: replacing .env files with 1Password, stepping outside of TypeScript's padded room, and temporal dead zones. Plus, Kamran fell into a rabbit hole and defeated the Red Queen: SSR with .NET.

Chapters

• (00:00) - Welcome to the Show

News

• TSGO News: PR #1732: Improves source file parse time by ~10%
• How Deno protects against npm exploits
• DBOS 2.0 adds JS support with a decoratorless API. (docs)
• What’s new in Astro - September 2025

From the Community

• Liran Tal: Mitigate Supply Chain Security with DevContainers and 1Password for Node.js Local Development
• Vincent Rolf: The Temporal Dead Zone, or why the TypeScript codebase is littered with var statements
• Paul Schmeing: TypeScript and the Illusion of Type-Safety
• Theo: Life after TypeScript
• Kamran: dotnet-ssr, an (experimental!) .NET SSR host

Cool Stuff

• Erik's LD58 Game Jam: Play the Gem Jam Game
• Video: Kamran on rendering React Router using a .NET SSR host
• Book: Ensh*ttification with Cory Doctorow (plus, Interview with Adam Conover)
• Kamran's Course: Staying on Task with the Pomodoro Technique
• Kamran's Course: Prioritizing Work with Rocks, Pebbles, and Sand
• Library: microsoft/node-api-dotnet, advanced interoperability between .NET and JavaScript in the same process.
• Library: agracio/edge-js, run .NET and Node.js code in-process on Windows, MacOS, and Linux

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of September 22, 2025: new default option in TS 6.0, Jiti upgrade, and Cloudflare's on a tear. Plus, npm's security roadmap. From the community: Python-style kwargs, running TS on MS-DOS, and running JS on PlayStation.

Chapters

• (00:00) - Welcome to the Show

News

• PSA: State of JavaScript 2025
• TS 6.0 will enable "noUncheckedSideEffectImports" by default 🎉 (h/t Rob Palmer)
• Jiti 2.6 – runtime for TS/ESM in Node.js is now using SWC/RSPack
• tc39/proposal-nonextensible-applies-to-private (h/t Rob Palmer)
  • “This breaking change means that if you seal/freeze an object, it cannot later have private fields stamped upon it ❄️”
• DanielRosenwasser/proposal-array-push-all (h/t Rob Palmer)
  • “It lets you append many items into an existing array without running out of stack memory 👍”
• tc39/proposal-iterator-chunking (h/t Rob Palmer)
  • “It lets you make iterators that can chunk & window content”
• Cloudflare: Cap'n Web: a new RPC system for browsers and web servers
• Cloudflare: Code Mode: the better way to use MCP
• Cloudflare: A year of improving Node.js compatibility in Cloudflare Workers (h/t James Snell)
• GitHub: Our plan for a more secure npm supply chain
• Metaframeworks: Astro 5.14

From the Community

• Course: Free TypeScript tutorial (Scrimba) 
• David Brownman: Python-style kwargs in TypeScript
• Jimbly: From Steam to Floppy: Porting Modern TypeScript to Run on DOS
• JSLegendWeb: You Can Now Make PS2 Games in JavaScript 
• Discussion: Is Effect-Ts really good or is it just hype? : r/typescript

Cool Stuff

• Cool Tools: https://tiny-helpers.dev/ (by Stefan Judis) 
• Cool Games: Minnesota-made games (by Martin Grider)
• Cool Game: https://andre-lima.itch.io/now-thats-a-big-dragon 
• Cool Game: https://mookie4242.itch.io/escape-the-well 
• Cool Tools: Caddy and Vite plugin (h/t nuqayah)
• PSA: Find Missing Money & Unclaimed Property (mn.gov / Go find your state)

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of September 15, 2025: Shai-Hulud worm hits npm supply chain, WebAssembly 3 spec is ratified, and Elixir fans finally get their time in the spotlight. From the community: SquiggleConf was awesome, type branding and tuples, local-first app dev, and why @ts-ignore is almost always the worst option.

Chapters

• (00:00) - Welcome to the Show

News

• Socket.dev covers Shai-Hulud: 
  • Updated and Ongoing Supply Chain Attack Targets CrowdStrike npm Packages 
  • Popular Tinycolor npm Package Compromised in Supply Chain Attack 
  • What the npm package attacks mean for us developers
• Wasm 3.0 spec completed
• Announcing AshTypeScript, part of the Ash Framework (Phoenix/Elixir)
• ts-to-zod now supports Zod 4.0
• Typebox 1.0 release

From the Community

• SquiggleConf Happened! Check out the streams (separate videos to come)
  • Day 1: https://www.youtube.com/live/C_ePbVZqXrw?si=MpRiE8n4xLNpfbV0
  • Day 2: https://www.youtube.com/live/vSXLDvvIpYE?si=cWKQTjZCx91HWJN9
• Federico (AzraelSec): Type Branding in Typescript 
• Renato: TypeScript Tuple Length 
• Evan Hahn: @ts-ignore is almost always the worst option
• Roadmap.sh: Everything You Need to Learn to be a TS Dev
• GitHub Actions can now run pure TS on Node 22/24 runners without a build step (h/t Brian Muenzenmeyer)
• Mathew Brown: Using Node's Test Runner with Typescript & React 
• Library Watch: Combinatorial CLI opt parsing
• Library Watch: Introducing: @traversable/valibot (h/t Andrew Jarret)
• Tool watch: FullStacked, a local-first app development environment
• Tool watch: Roguestrad, a Retro 3D Game engine forked from DOOM-3-BFG with TypeScript scripting support

Cool Stuff

• Funny Read: Is your son a computer hacker?
• Cool Lib: dom-to-image-more – render DOM elements as images
• Cool Tool:  Pages CMS - Hassle-free CMS for static sites powered by Git 

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

David Blass (@ssalbdivad.dev) teaches the two fools about ArkType and its 1:1 validator type system. If you, like us, thought ArkType was only about validation, think again! David pulls back the curtain on what makes ArkType unique, how he built a type-level parser to provide helpful error messages, and why ArkType can provide soundness guarantees that go beyond even what vanilla TypeScript can offer. *waves hand* These are the array intersections you're looking for.

Chapters

• (00:00) - Introducing David Blass

Resources

• ArkType.io
• ArkType Discord
• ArkType GitHub
• @ark/attest testing library

Where to Follow David

• David on BlueSky
• ArkType on BlueSky

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of September 8, 2025: Deno 2.5 adds a bunch of DX improvements, Fresh 2.0 is out of beta, and a supply chain attack mitigation for pnpm users. From the community: Val Town's OSS TypeScript editor, discussing underrated TS features, and tools/libraries to help make your configs, secrets, and forms type-safe.

Chapters

• (00:00) - Welcome to the Show

News

• TSGo
  • Full JSDoc Support in LSP (#1702) by Anders
  • TypeScript Build Watch Mode (#1684) by Sheetal
• Deno 2.5 + Fresh 2.0
• Rspack 1.5.3 features advanced tree shaking for dynamic import members
• Pnpm 10.16 adds “minimumReleaseAge” to help mitigate supply chain attacks

From the Community

• Dr. Axel’s Corner
  • Learning web development: Implementing web servers 
  • Learning web development: Authenticating users with plain Node.js
• OneUpTime: Lessons from npm's Security Failures 
• Wojciech Maj: Why using Bun in production (maybe) isn't the best idea
• Val Town’s open source TS editor was rewritten from scratch
• Josh Goldberg is tracking common rules across linters for Flint
• Reddit discussion: Name underrated things in Typescript
• Tool watch: https://www.confkit.dev/ (h/t HackerNews) -- Type-safe config and schemas that work across all runtimes
• Library watch: https://taxum.js.org/ (h/t DASPRiD) -- TypeScript-first HTTP framework
• Library watch: https://github.com/marcomuser/conformal -- Type-safe FormData and submissions

Cool Stuff

• Cool Tool: https://github.com/microsoft/typescript-analyze-trace
• Cool Watch: Retrofitting a broken Game Boy with modern upgrades
• Now playing: AC: Mirage

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of September 1, 2025: Deno Fresh 2.0 is now in beta, Swift 6.2 adds WASM support, and a serious spear-phishing attack on npm maintainers. From the community: looking back on TypeScript, optimizing immutability, type-safe state machines, sharing Wi-Fi links, and some prolific open source work.

Chapters

• (00:00) - Welcome to the Show

News

• typescript-eslint v8.43.0 introduces a new rule to disallow empty type arguments
• Fresh 2.0 Graduates to Beta, Adds Vite Support (h/t deno)
• Rolldown will only be shipping as ESM, dropping their CJS bundle (h/t VoidZero)
  • Clarification: It will still bundle your code as CJS; this applies only to Rolldown itself.
• Swift for Wasm: Q3 2025 Updates (h/t maxdesiatov)
• Reminder: TypeScript AI Conf is Nov 6
• PSA: Vite CVEs. Upgrade your packages!
  • CISA mailing list for cybersecurity incidents
• PSA: Hackers hijack npm packages with 2 billion weekly downloads in supply chain attack
• PSA: Hackers steal 3,325 secrets in GhostAction GitHub supply chain attack

From the Community

• TS 1.5 nostalgia (h/t rob palmer)
• Dr. Axel’s Corner
  • Learning web development: Frontend frameworks 
  • Learning web development: Installing npm packages and bundling 
• Immer.js optimizations coming
• Meta Piracy Case You might be owed $$$
  • Search LibGen, the Pirated-Books Database That Meta Used to Train AI 
  • It has affected Dan Abramov and Josh Goldberg 
• Library watch: wifi-share-link: Create shareable links over Wi-Fi with QR codes (h/t Joshua Goldberg)
• Library watch: @machinist/core for type-safe finite state machines 
• Library watch: TMF: Model-driven development for TypeScript 
• Library watch: pixltd-dev/ts-mini-translate, a simple TypeScript translation utility
• Check out Azat’s work! Including Josh Goldberg’s favorite ESLint plugin, perfectionist.
• This week's TS joke

Cool Stuff

• 2D math utilities: https://github.com/romgrk/2d-geometry 
• Video: A Complete Guide To The Business Side Of Indie Gamedev
• Book: A New Way to Think by Roger Martin (Thriftbooks)
• Game: Hollow Knight: Silksong

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of August 25, 2025: the two fools unpack the expected breaking changes to TSConfig in the upcoming 6.0 release, explain Node's latest LTS notable changes, and cover the latest in the JS trademark case from Deno. Plus, a PSA if you use Nx! From the community: making the case to migrate to Node's type stripping, a peek at Vitest 4, Zod's new Codecs feature, refactoring types, Rolldown is the opposite of a letdown, and a bunch of neat libraries/framework releases to watch.

Chapters

• (00:00) - Welcome to the Show

• Kamran's new Qwik City Foundations course (requires subscription)
• Affected by the Verizon outage? Get some monies (or try visiting the Transfer Phone/PIN page in your account)
• Alternatively, switch to Mint and save some cheddar (that's Kamran's referral link :-)

News

• TS 6.0 proposed deprecations and breaking changes
• Node 22.19.0 LTS notable changes include a new CA certificate API and unflagging WASM modules (see: source-phase imports)
• Rspack 1.5 release features type re-export analysis
• Deno's GoFundMe for #FreeJavaScript
• PSA: Nx supply chain attack (write-ups from Socket.dev and TheHackerNews)

From the Community

• SquiggleConf: September 18-19
• Calm.com: How we migrated our Rush.js monorepo to Node type stripping
• Dr. Axel
  • JavaScript’s trademark problem 
  • Learning web development: Web servers 
  • Learning web development: JavaScript exceptions
  • Learning web development: JSON and processing files in Node.js 
  • Learning web development: JavaScript Maps
• Vitest 4 will be faster!
• Zod creator explains 4.1's new codecs feature
• Uppy issue reveals a bug in JSX typing across ecosystem
• TypedRocks: Let’s Replace 100+ React Types with 3 Lines Of Code (Same Type Safety!) 
• Possible sighting of neovim TSGo support
• Library watch: doeixd/csv-utils: Helpful utils for working with csv files or arrays of objects
• Library watch: ammuench/contrastrast: A library to determine text contrast based on WCAG Standards 
• VoidZero: How PLAID Cut Build Times by 97% Migrating From Rollup To Rolldown
• Framework watch: Runner V4 released
• Framework watch: trueadm/ripple: the elegant UI framework for the web
• This week's TS Joke

Secret of the Handbook

The declarationMap config option significantly speeds up Project References performance in IDEs.

Cool Stuff

• MuJS: Introduction 
• Cory Doctorow’s Kickstarter
• Legendary Nintendo game designer published 200+ videos on gamedev for free.

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of August 18, 2025: one of the biggest nightly updates for TS Go, Rspack team announces a new linter, the new minor Bun release is pretty major, and Next.js 15.5 features typed routing . From the community: more learning web dev resources, an exhaustive switch utility for JSX, --strict on by default?, and whether you can really protect your code from clients. Plus, the two fools rant about feature flags.

Chapters

• (00:00) - Welcome to the Show

• Jake Bailey: TSGO had a big nightly update
• Socket.dev: Rspack Introduces Rslint, a TypeScript-First Linter Written in Go (powered by TS Go) (repo)
• Bun 1.2.21 release notes plus blog post on how they achieved a 500x faster postMessage(string)
• Deno 2.4.4 structured clone perf improvement 
• Next.js 15.5 release notes (summary thread)
• Preact 11 sneaks in a beta
• Angular 20.2.0 features a stable zoneless API 

From the Community

• Dr. Axel: 
  • Learning web development: Booleans, comparisons and `if` statements
  • Learning web development: Loops in JavaScript
  • Learning web development: Shells and Node.js
• Daniel Rosenwasser proposed to turn `--strict` on by default 
  • Correction: It was an issue, not a PR :-)
• Lib watch: valleys (ht HN) –  Lightweight, zero-dependency library for validating arbitrary runtime data in TypeScript.
• Hangman in TypeScript types
• Discussion: Protect code & assets? : r/typescript
• Replo.computer: Exhaustive Switch Expressions in Typescript

Cool Stuff

• Blog post: Dual Tilemap Auto Tiling 
• Steam Game: Now THAT’S a Big Dragon
• Video: A million blades of grass in LOVR + TypeScript
  • LÖVR - VR version of LOVE 2D
  • TypeScriptToLua
• Join the Michigan TS Discord!

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)

News of the week of August 11, 2025: there ain't much! Astro 5.13 minor release brings enums to Astro DB and improved meta environment variables. From the community: learning web dev, Result-typing Next.js server actions, and Clickhouse built an ORM.

Chapters

• (00:00) - Welcome to the Show

• Astro 5.13 

From the Community

• Dr. Axel’s Blog Series on Learning Web Dev
• Nahuel Scotti: Type-Safe data flow between client & server in Next.js applications
• Clickhouse: Does OLAP need an ORM? 
  • Plus, listen to our ORMed and Dangerous (Ep 7) deep dive episode!

Cool Stuff

• More Excalibur Games!
  • https://daviderisaliti.itch.io/spookytruth 
  • https://daviderisaliti.itch.io/quadrush 
  • https://mookie4242.itch.io/zombie-shooter-clone 
• Nextra – a Next.js static site generator with some built-in gizmos 
• editly – non-linear video editing with Node.js and ffmpeg

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript game engine for making 2D web games. Use your TypeScript or JavaScript skills to make games! Excalibur comes out-of-the-box with everything you need to make web games, like physics, sprites, animations, sound effects, input, and particles. Design your assets with tools like Aseprite and Tiled, then load them natively using first-party plugins.

Music
Seahorse Dreams by Kubbi (Spotify)