TypeScript.fm - The Friendly Show for TypeScript Developers

News for the week of January 19, 2025: Rolldown reaches 1.0 release candidate, and a PDF library we all deserve. From the community: a better npm admin experience, supertype safety, and modern package.json targets.
Stand With Minnesota
We are native Minnesotans. The ICE occupation is affecting our community in so many ways and has disrupted daily life for thousands of us. Families are sheltering in place, fearing to go to work, let their kids walk to school, take the bus, or even attend school at all. Adults and children are being abducted from their workplaces, schools, cars, and homes with aggressive tactics and without due process. There have been dozens of well-documented violations of our civil liberties and rights as US citizens, including the illegal detainment of peaceful protestors, constitutional observers, and people of color. ICE has shot and killed two US citizens already in the span of 3 weeks: Renee Good, a mother of three, and Alex Pretti, a VA nurse. They are out of control, they are causing irreparable harm, and we want them out of our cities.
Go to StandWithMinnesota.com to learn how you can help.
Chapters

(00:00) - Welcome to the Show

(06:36) - News: TypeScript PR to Support Import Attributes in d.ts Files

(09:00) - News: Deno 2.6.6 Brings Some QOL Improvements

(10:15) - News: Rolldown 1.0 RC is Here

(14:13) - News: TC39 ECMAScript Proposal Updates

(19:04) - News: Firefox 147 Adds WebGPU on Apple Sillicon and Brotli Compression

(21:04) - News: Nuxt 4.3 Supports Inlining Critical CSS for Webpack and Rspack

(22:33) - PSA: Svelte Ecosystem Vulnerabilities

(24:26) - Library Watch: LibPDF, the PDF Library TypeScript Developers Deserve

(26:17) - Library Watch: ts2rs, Transforms TS Types to Rust Types

(27:38) - Library Watch: Mastra, TS Agent Toolkit, Reaches 1.0

(28:23) - PSA: Lodash Gets a Security Update and Governance from OpenJSF

(29:20) - Community Highlight: Daniel Roe Wants to Hear Your npm Frustrations

(29:57) - Community Highlight: Don't Assign a Map to WeakMap

(30:59) - Community Highlight: Super Monkey Ball on the Web

(31:38) - Community Highlight: Package.json for Modern Targets

(33:18) - Community Highlight: How Next.js Built Turbopack

(33:39) - Bleet of the Week

(34:21) - Cool Link: Crudy, a Postman Alternative

(35:05) - Cool Video: SystemOfLevers on How to Make a Gameboy Game

(35:24) - Cool Video: How to Make a Homebrew GPU

(35:57) - Cool Video: Transforms 101 by Scott

(36:17) - Cool Link: StandWithMinnesota.com

(37:29) - The Minnesota Long Goodbye

News
TypeScript PR to add support for import attributes in ambient module declarations. Motivating example (from Vite team) 
Deno 2.6.6
Rolldown 1.0 RC 
TC39 News via Rob Palmer
Firefox 147 release notes for developers 
Nuxt 4.3
CVEs affecting the Svelte ecosystem 
LibPDF, the PDF library TypeScript developers deserve
ts2rs for converting TS types to Rust types
Announcing Mastra 1.0! 
PSA: Lodash Rolls Out Major Security Overhaul
From the Community
Daniel Roe calls out for npm frustrations, creating npmx.dev 
Tip: Supertype safety? WeakMap is a supertype of Map 
Super MonkeyBall in a browser 
Discussion: Types, Package.json, and Modules 
Next.js: Inside Turbopack: Building Faster by Building Less
Cool Links
Crudy is an alternative to Postman
Gameboy Games by @systemoflevers 
A Homebrew GPU for a Homebrew CPU
Transforms 101 by Scott
Music
Seahorse Dreams by Kubbi (Spotify)

News for the week of January 12, 2025: Astro finds a new home, Chrome ships Temporal API, and latest Node marks require(esm) as stable. From the community: type-safe UI, how TypeScript differs at dev-time vs runtime, and Deno's (impressive) latency under load.
Sponsored by Excalibur.js
Excalibur.js is the free and open source friendly TypeScript 2D game engine for the web. Learn to make web games with TypeScript or JavaScript! Excalibur comes out-of-the-box with everything you need, like physics, sprites, animations, sound effects, and first-party plugins for popular 2D gamedev tools.
Homepage and Docs: https://excaliburjs.com
Make Your First Game in 10 Minutes
Join the Discord: https://discord.gg/9UemP985Uy
Chapters

(00:00) - Welcome to the Show

(05:11) - News: Astro Joins Cloudflare

(06:09) - News: Astro 6 Beta Brings Parity to Dev and Prod Behavior

(07:46) - News: Node 25.4.0 Brings Stable require(esm)

(09:42) - News: Chrome 144 Ships Temporal, Safari... wen?

(12:58) - Library Watch: Ohm Lets You Build Parsers, Interpreters, and Compilers

(14:07) - PSA: Fastify Express Middleware Bypass Vulnerability

(15:09) - Community Highlight: Daniel Rosenwasser Fixes BOM Bug

(15:53) - Community Highlight: Type-safe UI by Andrew Hathaway

(16:51) - Community Highlight: Forcing TS to Be Exhaustive by Carlos Menezes

(18:11) - Community Highlight: Deno's Low Latency Under Load

(19:43) - Community Highlight: Deno 2.6.5 Adds WebP and GIF Support to createImageBitmap

(20:08) - Community Highlight: TypeScript. Runtime. And In-between by Ariel Shulman

(20:48) - Community Highlight: You Should Be Using Dev Containers

(21:42) - Community Highlight: useOptimistic Won't Save You by Colum Kelly

(22:09) - Community Highlight: React Native Best Practices for AI Agents by Callstack

(23:39) - Bleet of the Week

(24:23) - Cool Link: Gameboy LEGO Set

(25:00) - Cool Link: Global Game Jam is Happening Soon

(25:56) - Cool Link: Realistic Terrain with Wave Function Collapse

(27:19) - Cool Link: Complete CSS Course by Andy Bell

(29:13) - The Minnesota Long Goodbye

News
Astro: The Astro Technology Company joins Cloudflare Theo: Cloudflare takes on Next.js 

Astro: Astro 6 Beta 
Node 25.4.0 is out: Joyee Cheung BSky Thread
Chrome 144: Temporal shipped, Safari its your turn (via Andy Bell)Sarah Gooding: Temporal API Ships in Chrome 144, Marking a Major Shift for JavaScript Date Handling (via Rob Palmer)
Temporal Polyfill
Differential serving / bundling by Jeremy Wagner

Library Watch: Ohm (via JavaScript Weekly Issue 768: January 13, 2026)
PSA: Fastify Express middleware can be bypassed
From the Community
Daniel Rosenwasser found a latent bug in TS 6.0 with BOMs and strict testing
Andrew Hathaway: Type-Safe User Interfaces & the Manifest Pattern 
Carlos Menezes: Forcing TypeScript to be exhaustive 
Deno: P99 Latency is 72% Lower Than Node.js
Deno: Deno 2.6.5 Adds WebP and GIF Support to createImageBitmap 
Ariel Shulman: Typescript. Runtime. And in Between. - Ariel Shulman - NDC Copenhagen 2025
 Syntax/Coding Garden: you should be using dev containers
Colum Kelly: useOptimistic Won't Save You (via React Weekly Issue #3) 
Callstack: Announcing: React Native Best Practices for AI Agents (via React Weekly Issue #3)
Cool Links
Cool Buy: Game Boy™ 72046 LEGO set
Cool Link: Global Game Jam  is happening!
Cool Code: Wave Function Collapse by jyoung4242 (plus a sprite animation creator)
Cool Course: Complete CSS - Piccalilli by Andy Bell 
Music
Seahorse Dreams by Kubbi (Spotify)

News for the week of January 5, 2025: patch all your Node.js installations! Like now! Plus, a new TypeScript ESLint fixer for unused imports. From the community: why we all suck at logging, the concise TypeScript book, and all the JS engines in one page.
Sponsored by Excalibur.js
Excalibur.js is the free and open source friendly TypeScript 2D game engine for the web. Learn to make web games with TypeScript or JavaScript! Excalibur comes out-of-the-box with everything you need, like physics, sprites, animations, sound effects, and first-party plugins for popular 2D gamedev tools.
Homepage and Docs: https://excaliburjs.com
Make Your First Game in 10 Minutes
Join the Discord: https://discord.gg/9UemP985Uy
Chapters

(00:00) - Welcome to the Show

(05:59) - News: Node.js Patch Tuesday

(12:13) - News: Astro 2025 Year in Review

(13:19) - News: What's New in ViteLand, December 2025

(13:41) - News: TypeScript ESLint 8.5.3 Adds Unused Import Fixer

(14:16) - Library Watch: Typique, Bundler Agnostic CSS-in-TS

(19:04) - Community Highlight: JS Engine Zoo by Ivan Krasilnikov

(21:24) - Community Highlight: Logging Sucks by Boris Tane

(24:49) - Community Highlight: Optique Sync/Async Mode Support by Hongmin Lee

(25:44) - Community Highlight: Use Vitest Projects by How to Test Frontend

(26:27) - Community Highlight: The Concise TypeScript Book by Simone Poggiali

(28:08) - Community Highlight: Syntax.fm with Dimitri on Type Slayer

(29:02) - Community Highlight: Jake Bailey's GopherCon Talk Now on YT

(29:47) - Community Highlight: Things-viz, Visualize Your Things 3 Todo Lists

(30:40) - Bleet of the Week

(31:09) - Secret of the Handbook: Decorators

(33:47) - Cool Link: TransparentTextures.com

(34:25) - Cool Link: FreeToUse.com

(35:11) - Cool Product: Mighty-3 Music Player

(37:51) - The Minnesota Long Goodbye

News
Node PSA: Security Releases for January 13
Astro: 2025 Year in Review
VoidZero: What’s New in ViteLand: December 2025 Recap 
TypeScript ESLint 8.53.0: Unused Imports
Library Watch: aleksei-berezkin/typique: Bundler-agnostic, zero-runtime CSS-in-TS
From the Community
Ivankra: Javascript Engine Zoo
Boris Tane: Logging Sucks
Hongmin Lee: Optique's type-safe sync/async mode support
How to Test Frontend: Why you should start using projects in Vitest configuration
Simone Poggiali: The Concise TypeScript Book
Syntax.fm: How this guy got DOOM running purely in TypeScript Types 
Devtools.fm: Storybook Modernization
Jake Bailey: Porting TS to Go (Gophercon talk)
David Crespo: Things-viz TypeScript CLI
Secret of the Handbook: TypeScript Decorators Deep Dive
Cool Links
Transparent Textures - Create background tiling images
Free to Use - Like Lofi music
Mighty 3 music player
Music
Seahorse Dreams by Kubbi (Spotify)

News for the weeks of December 22 and 29, 2025: MongoDB exploit drops on Christmas day in true Grinchy fashion, a new backend library called Vla that is far from blah, and starter templates for your next React Native app. From the community: NodeTLV keynote, strongly-typed events in gamedev, and a 6-hour deep dive into Doom in TS.
Sponsored by Excalibur.js
Excalibur.js is the free and open source friendly TypeScript 2D game engine for the web. Learn to make web games with TypeScript or JavaScript! Excalibur comes out-of-the-box with everything you need, like physics, sprites, animations, sound effects, and first-party plugins for popular 2D gamedev tools.
Homepage and Docs: https://excaliburjs.com
Make Your First Game in 10 Minutes
Join the Discord: https://discord.gg/9UemP985Uy
Chapters

(00:00) - Welcome to the New Year

(07:52) - News: The Grinch Stole Your Secrets with MongoBleed

(10:39) - News: Node.js Security Release Expected January 7

(11:13) - Library Watch: Vla, the Missing Backend Library for TypeScript

(13:13) - Library Watch: macOS iMessage API SDK for TypeScript

(13:53) - Library Watch: React Native UI Templates

(14:51) - Library Watch: js-draw, a Canvas Drawing Library

(15:48) - Community Highlight: Strongly-typed Events in GameDev by Justin Young

(16:19) - Community Highlight: Flint, a Modern Linting Engine by Josh Goldberg

(16:42) - Community Highlight: Tooling Like It's 2025 by Josh Goldberg

(16:59) - Community Highlight: Major Color.js Update by Lea Verou

(19:18) - Community Highlight: Building Reusable Form Component Library with TanStack Form by Matt Huggins

(19:54) - Community Highlight: Static Hermes is Pretty Cool by Devon Govett

(21:11) - Community Highlight: DOOM in TS Types Stream by MiTS

(22:09) - Community Highlight: Solitaire in TypeScript by Oidoid

(22:57) - Community Highlight: Lo-fi Valley Engine by Leocast

(24:12) - Bleet of the Year

(25:26) - Cool Link: TypeScript Function Inlining

(25:49) - Cool Link: Pass Key Explainer

(29:58) - Cool Game: Outer Worlds 2

(31:26) - The Minnesota Long Goodbye

News
PSA: Exploited MongoBleed flaw leaks MongoDB secrets, 87K servers exposed 
PSA: Node.js — Wednesday, January 7, 2026 Security Releases 
Library Watch: Vla, a data layer that integrates into any TypeScript framework
Library Watch: TypeScript SDK for iMessage automation on macOS
Library Watch: React Native UI Templates
Library Watch: js-draw, pencil/pen drawing utilities for JS and Canvas
From the Community
Justin Young: Strongly Typed Events in GameDev
Josh Goldberg: NodeTLV Keynote, Tooling Like It's 2025 
Josh Goldberg: What Flint Does Differently
Lea Verou: ColorJS major release
Matt Huggins: Building a Reusable Form Component Library with TanStack Form
Devon Govett: Static Hermes is pretty cool
MiTS: Doom TS deep dive stream
oidoid: Super Patience - Pixelated Solitaire in Typescript
Leoocast: Lofi Valley Engine - Make your dream Stardew Valley clone

Cool Links
Cool Watch: How Passkeys Work - Computerphile 
Cool Tool: JoshuaKGoldberg/ts-function-inliner: TypeScript transformation that inlines calls to small functions
Cool Game: Outer Worlds 2, from the developers of Fallout: New Vegas and Avowed
Music
Seahorse Dreams by Kubbi (Spotify)

Our last episode for 2025, see you in 2026! News for the week of December 15 2025: Microsoft's experimental JS/TS modernization agent, new Next.js and Bun releases, and how pnpm is tightening the security screws. From the community: when to use types vs. interfaces, actionable tips on securing your local dev environment, and tips on using TypeScript types as a programming language.
MCP in Practice Course
Out now. Kamran shows you how to build a practical enterprise-grade MCP server with .NET, C#, and OAuth, hosted remotely on Azure. (Requires subscription)
Sponsored by Excalibur.js
Excalibur.js is the free and open source friendly TypeScript 2D game engine for the web. Learn to make web games with TypeScript or JavaScript! Excalibur comes out-of-the-box with everything you need, like physics, sprites, animations, sound effects, and first-party plugins for popular 2D gamedev tools.
Homepage and Docs: https://excaliburjs.com
Make Your First Game in 10 Minutes
Join the Discord: https://discord.gg/9UemP985Uy
Chapters

(00:00) - Welcome to the Show

(05:18) - News: TSGo Now Supports Experimental Decorators

(06:18) - News: JS/TS Modernization Agent for VS Code

(09:47) - News: Next.js 16.1 Brings Turbopack Caching and a Build Analyzer

(10:32) - News: Bun 1.3.5 ft. Terminal Simulator, Compile-time Feature Flags

(12:50) - News: Standard Schema V1 Released

(14:24) - News: pnpm 10.26 Has Stricter Security Defaults

(16:16) - News: Node Security Updates Pushed to Jan 7

(16:52) - Library Watch: numpy-ts, NumPy but in 100% TypeScript

(18:57) - Library Watch: tinypdf and tinydocx, Minimal Document Creation

(20:02) - Community Highlight: npm Security Best Practices by Liran Tal

(23:10) - Community Highlight: TypeScript Types as a Programming Language by Thiery Michel

(24:46) - Community Highlight: Build a Dino Runner in Deno, pt 3

(25:26) - Community Highlight: Types vs. Interfaces by Yan Sun

(26:31) - Community Highlight: Eleventy's Progress on Zero Config TS

(27:10) - Bleets of the Week

(28:24) - Cool Link: noclip.website Lets You Explore Retro Game Levels

(29:46) - Cool Tool: unplugin-inline-functions for Inlining Functions

(31:48) - Cool Tool: rsdoctor, Analyze Rspack and Webpack Bundles

(33:26) - The Minnesota Year-long Goodbye

News

Excalibur.js V0.32.0 holiday release
TSGo PR #2343 adds experimental decorators support
Microsoft: Announcing the JavaScript/TypeScript Modernizer for VS Code
Next.js 16.1 adds Turbopack improvements
Bun: 1.3.5 release terminal simulator (PTY) and compile-time feature flag dead-code elimination
Standard Schema V1 release (h/t ArkType and Josh Goldberg) 
Library Watch: https://www.npmjs.com/package/numpy-ts
Library Watch: Lulzx/tinydocx: Minimal DOCX/ODT creation library
Library Watch: Lulzx/tinypdf: Minimal PDF creation library

From the Community
Liran Tal: NPM Security Best Practices: How to Protect Your Packages After the 2025 Shai Hulud Attack
Thiery Michel via MarmeLab: TypeScript Types as a Programming Language 
Deno Runner, Part 3: Build a dinosaur runner game with Deno, pt. 3 
Yan Sun via LogRocket: Types vs. interfaces in TypeScript 
Zach Leatherman: 11ty Zero Config TypeScript
Cool Links
Cool Plugin: krispya/unplugin-inline-functions - Vite/unplugin for C/C++ style inlining 
Cool Link: NoClip.website lets you fly around classic game levels like Super Paper Mario, Majora's Mask, and Mario Kart Wii
Cool Tool: rsdoctor is a bundle analyzer for Rspack-family of tools (and webpack!)
Music
Seahorse Dreams by Kubbi (Spotify)