TypeScript.fm - The Friendly Show for TypeScript Developers

Mauro Bieg joins the two fools to talk about Mastro, a simple and minimal web framework and site generator. If 11ty and Astro had a baby, it might look like Mastro! With support for routing, HTML templating, streaming, and even reactive UI, Mastro might be a great fit for your next content-driven website.
Resources
Mastro Website
Mastro on GitHub
Mastro on BlueSky
Where to Follow the Team
Mauro on GitHub
Mauro on BlueSky
Chapters

(00:00) - Introducing Mauro Bieg

(03:12) - What is Mastro.js?

(05:39) - How Mastro Renders HTML

(10:04) - Comparing Mastro.js with Other Frameworks

(14:55) - Handling Server Requests in Mastro

(20:00) - Client and Server Separation

(26:39) - Client-Side Functionality with Reactive Mastro

(32:18) - Leveraging Web Standards and Native Runtime Features

(34:14) - Working with Multiple Runtimes

(40:31) - TypeScript Integration and Type Checking

(41:51) - Support for HTTP Streaming

(47:07) - How Mastro Performs

(49:01) - Getting Started with Mastro

(51:33) - Where to Find Mauro

Sponsored by Excalibur.js
Excalibur.js is the friendly TypeScript 2D game engine for the web. 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, tile maps, particles, and more.
Homepage and Docs: https://excaliburjs.com
Make Your First Game in 10 Minutes
Join the Discord: https://discord.gg/9UemP985Uy
Music
Seahorse Dreams by Kubbi (Spotify)

News for the week of January 26, 2026: Yarn 6.0 is rewritten in Rust, Anders interviewed on history and future of TypeScript, and a PSA on the Notepad++ update system. From the community: start using the satisfies keyword, learn more about Node Single Executable Applications (SEAs), and a DnD rule engine written in TS.
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. It is not just affecting immigrants, it is affecting all of us.
Go to StandWithMinnesota.com to learn how you can help.
Chapters

(00:00) - Welcome to the Show

(05:11) - News: Removing ES5 Target for TS 6.0

(08:46) - News: Yarn 6.0 is Rewritten in Rust

(13:55) - News: Anders Interviewed on History and Future of TypeScript

(17:56) - News: Astro 5.17

(18:24) - News: 11ty, 2025 Year in Review

(19:33) - PSA: Notepad++ Hacked, Don't Use In-app Updater

(21:09) - PSA: More React Vulnerabilities, Update RSC Packages

(23:08) - Library Watch: ReliCSS, Fix Your Ancient CSS

(24:23) - Library Watch: Clack 1.0, Stylish Prompts for CLI Tools

(25:28) - Library Watch: TypeScript D20 Rule Engine for DnD

(27:02) - Community Highlight: satisfies Keyword is OP

(28:26) - Community Highlight: Does JIT Go Brrr? by Savannah.dev

(29:22) - Community Highlight: Node SEAs by Joyee Cheung

(30:08) - Community Highlight: Node is Getting a Virtual File System

(31:29) - Community Highlight: Deno on Windows ARM?

(32:27) - Community Highlight: Mocha.js Gets a Fresh Website

(32:51) - Community Highlight: In Mastro, Everything is a Route

(33:20) - Community Highlight: Hacking Compiler to Get const-known TemplateStringArray

(35:04) - Community Highlight: Gamedev.js Survey Results Are In

(37:19) - Bleet of the Week

(39:41) - Cool Video: Metroid's 8-bit Gravity by NESHacker

(40:21) - Cool Video: AI LEGO PixelArt Robot

(41:10) - Cool Link: Giantbomb x MinnMax Fundraiser for VEAP

(43:26) - Cool Watch: Planet Earth Series

(44:41) - The Minnesota Long Goodbye

News
TS 6.0: PR to remove ES5 merged! (via Rob Palmer)
Yarn: New 6.0 preview, rewritten in Rust
GitHub: 7 learnings from Anders Hejlsberg: The architect behind C# and TypeScript
Astro 5.17 release notes 
Eleventy, 2025 in Review 
PSA: Notepad++ Update Servers Got Hacked, download 8.9.1 manually!
PSA: Denial of Service Vulnerabilities in React Server Components
Library Watch: Introducing ReliCSS: A Tool for Front-End Archaeology
Library Watch: Clack 1.0 lets you build stylish interactive CLI prompts
Library Watch: DnD D20 rule engine written in TypeScript
From the Community
Web Dev Simplified: satisfies keyword is awesome
Savannah Ostrowski: Does JIT  go brrr? 
Joyee Cheung: Improving Single Executable Application Building for Node.js 
Matteo Collina: VFS coming soon
Deno: Windows ARM BUILD!?
Joshua Goldberg: Mocha has a new Astro frontend!!
Mastro: Everything in Mastro is a Route
Cinny.bun.how: patching TypeScript compiler to get const-known TemplateStringsArray 
Gamedev.js Survey Results are In: The State of Web Game Dev in 2025
Cool Links
Metroid's 8-Bit Gravity  
I made an AI LEGO® PixelArt Robot 
GiantBomb and MinnMax fundraiser for VEAP
Planet Earth (HBO)
Music
Seahorse Dreams by Kubbi (Spotify)

News for the week of January 19, 2026: 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, 2026: 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, 2026: 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)