Podd: TypeScript.fm - The Friendly Show for TypeScript Developers

TypeScript Native is Now in Preview | News | Ep 19

27 maj 2025 | 39 min

News for the week of May 19, 2025: Try out the new TypeScript Go native port, Zod 4 is out, and no, Deno is not dead.

Chapters

(00:00) - Introduction and Personal News
(05:12) - News: TypeScript Native is in Preview!
(10:12) - News: Anders' Talk About TS Native at MS Build
(12:58) - News: Zod 4 is Officially Released
(15:51) - News: Reports of Deno's Demise Are Greatly Exaggerated
(17:23) - News: Importing JSON Across Major Browsers
(20:13) - News: Experimental node.config.json Support
(24:43) - Community Highlight: A Brief History of JavaScript by Deno.land
(25:40) - Community Highlight: tsdown Now Supports Transpile-only Unbundle Mode
(27:21) - Community Highlight: Vite's Rolldown Preview is Here
(28:19) - Community Highlight: Go Attend Jake Bailey's Gophercon TS Talk
(28:41) - Community Highlight: super-utils-plus, a Modern Lodash Alternative That's TypeScript-first
(29:17) - Community Highlight: tsc.run, a TypeScript Serverless Framework
(29:58) - Community Highlight: How to Create a TS Library That Runs Everywhere in 2025
(30:45) - Community Highlight: TypeScript.jobs Board is Looking for Feedback
(31:28) - Cool Stuff: Markdown Presentation Frameworks
(33:21) - Cool Stuff: Wookash Interview with Andreas Kling
(34:31) - Cool Stuff: Computers & Prime Numbers by Purple Mind
(34:51) - Cool Stuff: Playwright Testing Talk from MS Build
(35:15) - Cool Stuff: Reporting on AI's Energy Usage
(35:51) - Cool Stuff: Six Ways to Make Your Electron App Faster
(36:56) - Fun Stuff: My New Favorite Hobby is Watching Microsoft Employees Being Slowly Driven Insane by AI Copilot

Links

Microsoft Announces TypeScript Native Previews
Zod 4 is officially released 🎉
Reports of Denos Demise are greatly exaggerated
You can now import json files across browsers (h/t stefanjudis.com)
Experimental node.config.json support in Node 24.1.0 minor release (h/t aduh95)
Deno’s brief history of JavaScript
Tsdown now has unbundle support (h/t sxzz.dev)
Vite now has a Rolldown preview too
MS Build: Anders gave a talk on TypeScript native port
Jake Bailey built a tool called ts-to-go
Jake Bailey will also be speaking about TS Go at Gophercon
super-utils-plus: modern lodash alternative that's TypeScript-first by Dhaxor (Gain John)
How To Create a Simple TypeScript Library That Runs Everywhere (2025)
Tsc.run – A TypeScript-first serverless framework (via Reddit)
Looking for a TS job? The TypeScript.jobs board folks are looking for feedback (via Reddit)
MIT Technology Review has an absolute banger of a series on AI energy usage
Improve Electron app performance by Amila over at palette.dev, the maintainer of electron-react-boilerplate
Reddit: My new favorite hobby is watching Microsoft employees being slowly driven insane by AI copilot
presenterm, a Markdown presentation tool that runs in your terminal
Via Daniel Raniz: https://sli.dev, another Markdown presentation tool
MS Build: Advanced Playwright Debugging and Test Resilience | DEM499
MS Build: How Microsoft Developers Use AI in Real-World Coding | BRK103
Can You Build a Web Browser? | Andreas Kling
How Computers Generate Massive Primes In Seconds
Google Slides Code Highlighter (from Roman Nurik)

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

Microsoft Layoffs Impact TypeScript Team | News | Ep 18

20 maj 2025 | 33 min

News for the week of May 12, 2025: Microsoft layoffs impact TypeScript team, and Deno explains the radio silence on Fresh 2.0.

Chapters

(00:00) - Personal News
(06:25) - Correction: Node 24's Security Model
(07:22) - News: Microsoft Lay-offs Impacting TypeScript Team
(11:32) - News: Deno Posts an Update on Fresh 2.0
(13:27) - News: TSGo Gets LSP Concurrency
(16:19) - Community Highlights: String Split Typing Quirks by kramer.run
(18:21) - Community Highlights: Shawn Wildermuth on "Just Enough TypeScript"
(18:57) - Community Highlights: Reminder for Migrating TS Import Paths in Node 24
(20:24) - Community Highlights: Reddit on What Was the Hardest Thing to Learn About TS?
(23:43) - Community Highlights: Increasing Memory Limit for eslint and TS Server
(24:02) - Community Highlights: Type Assertions: Trust Me Bro by chrisk-7777
(24:36) - Community Highlights: TypedRocks on the Secret 'this' Parameter
(26:58) - Cool Stuff: Typing your dotenv variables
(27:41) - Cool Stuff: Escape the City
(28:54) - Cool Stuff: Pirate Sea Shanties Meet Pop Rock
(30:07) - Cool Stuff: Open 5e for D&D Nerds
(31:17) - Cool Stuff: Run JavaScript in Godot

Links

News: Microsoft Layoffs
News: Deno Fresh – An Update on 2.0 (h/t deno.land)
Let Ron Buckton know how much you appreciate his work
Bluesky: String split quirk (h/t kramer.run)
Video: Oldie but a goodie (2023), “just enough TS" by Shawn Wildermuth
Tip: Don't forget about TS import migration for Node 24 (h/t jakob.jingleheimer.dev)
Reddit Discussion: what was the hardest part of learning TypeScript?
Reddit tip: increasing memory limit for eslint and TS server
Blog: The TSConfig Cheat Sheet (Matt Pocock)
Blog: A Guide to tsconfig.json (Dr. Axel / 2ality)
Blog: Type Assertions and the as keyword (chrisk-7777)
Video: The Secret THIS Parameter: TypeScript’s overlooked Superpower Explained! (Typed Rocks)
Video: 6 TypeScript tips to turn you into a WIZARD (Matt Pocock)
Tip: strongly type process.env so you can enforce your dotenv files (h/t aaronmcadam.com)
Cool stuff: Escape the City outdoor game
Cool stuff: Sail North – pirate sea shanties meets pop/rock
Cool stuff: Open5e for D&D nerds
Cool stuff: Add TypeScript/JavaScript Support for Godot 4

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

What's New in Node 24 | Deep Dive | Ep 17B

15 maj 2025 | 38 min

In this week's deep dive, we cover everything TypeScript developers need to know about the latest Node 24 release, including examples of each new language feature. We've even put together a code snippet repo you can check out!

Chapters

(00:00) - Introduction to Node 24 and TypeScript Support
(02:49) - Type Stripping and Experimental Transform Types
(05:53) - Stable Permission Flag Security Model
(09:38) - V8 13.6 Brings New Language Features
(10:04) - API: CPU Hinting Micro-waits with Atomics.pause
(12:35) - API: Reduce Memory Using Float16Array
(14:56) - API: Format Time Durations with Intl.DurationFormat
(16:33) - API: Explicit Resource Management with using
(17:07) - API: What's Really an Error with Error.isError
(18:48) - API: Parse Routes with URLPattern API
(20:51) - API: Sanitize Input with RegExp.escape
(21:39) - API: RegExp Modifiers in Sub-expressions
(23:05) - API: RegExp Duplicate Named Capture Groups
(24:07) - PSA: Node 24 Typings Are Still a WIP
(25:14) - Deprecations and Removals
(29:17) - npm 11: Changes to Lifecycle Scripts
(30:41) - Undici 7 Brings HTTP Performance Enhancements
(31:11) - Test Runner Now Waits for Sub-tests
(31:45) - next-10 and the Future of Node.js

Links

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

Node 24 Officially Brings TS Support to the Masses | News | Ep 17

13 maj 2025 | 29 min

News for the week of May 5, 2025: Node 24 officially brings TS support to the masses, Parcel adds RSC support, and a TC39 proposal gets replaced.

Chapters

(00:00) - Introduction
(04:07) - News: Node 24 Release Highlights
(08:09) - News: What's New in TSGo?
(09:05) - News: TC39 Records and Tuples Proposal Has Been Withdrawn
(11:45) - News: Parcel Bundler Introduces Support for RSC
(13:15) - Community Highlight: Why Was Node 24 Delayed?
(15:52) - Community Highlight: Type-safe Theming in Tailwind CSS
(16:52) - Community Highlight: TypeScript Gotchas via Reddit
(20:48) - Community Highlight: Trick for Error Handling in TypeScript
(22:46) - Cool Stuff: V8 Compile Hints
(25:40) - Cool Stuff: Bare, a Minimal JavaScript Runtime
(26:16) - Cool Stuff: AwesomeDev's Node 24 Rundown
(26:27) - Cool Stuff: Build System in C for C
(27:01) - Cool Stuff: Typecraft's Vim Challenges

Links

Event: IGDATC Game.wav
Article: An introduction to Node.js 24 from Red Hat
Video: Awesome on Node.js 24
Repo: Records and Tuples Proposal replaced with tc39/proposal-composites
Video: Arrays, objects... now ‘composites’?
Docs: Parcel 2.14 introduces React Server Components
Bluesky: Interesting thread on why Node 24 was delayed
Article: Type-Safe Theming in Tailwind CSS Using CSS Variables and TypeScript
Redditors share TypeScript Gotchas
Article: Giving V8 a Heads-Up: Faster JavaScript Startup with Explicit Compile Hints
Video: Jason Yu shares his way of doing try..catch in TS
Video: Build System For C in C
Learn: Typecraft's Vim Challenges

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

Deno 2.3 Ships Tons of QOL Improvements | News | Ep 16

6 maj 2025 | 33 min

News for the week of April 28, 2025: Deno 2.3 brings some nice quality-of-life improvements, plus void(0) has released a new all-in-one bundler for your TypeScript libraries.

Chapters

(00:00) - Introduction
(04:51) - News: This Week in TypeScript Go
(05:47) - News: Deno 2.3 Released
(08:36) - News: tsdown is a TypeScript Bundler for Library Authors
(11:29) - News: Astro 5.7 Release
(13:04) - Community Highlights: "Macros" in TypeScript by cinny.bun.how
(15:40) - Community Highlights: Dan Abramov's AMA on BlueSky
(16:02) - Community Highlights: Josh Goldberg's Series on "If I Wrote a Linter..."
(18:03) - Community Highlights: Plaid Migrated 100 Services to Deno Deploy
(19:52) - Community Highlight: Pinterest Migrated 3.7MM Lines of Flow Code to TypeScript
(21:59) - Dr. Axel's Corner: Converting Values to Strings
(23:14) - Community Highlights: Build Your Own Build Tools with Immaculata
(24:52) - Community Highlights: Type-safe Route Management in Vue
(25:56) - Cool Stuff: Hate git? Try Sapling Instead
(27:45) - Cool Stuff: Nerd Out with HVAC Ceiling Cassettes
(30:00) - Cool Stuff: Build Custom Fonts with FontForge
(30:28) - Cool Stuff: Quantum Computing Explainer by 3Blue1Brown
(31:05) - Cool Stuff: "Ed", an Early Text Editor
(31:25) - Cool Stuff: 4000+ Icons for Your Game at Game-Icons.net

Links

Website: Minnestar events
Website: IGDATC
Tool: Deno 2.3
Tool: tsdown
Tool: Astro 5.7
Bsky thread: Macros in TypeScript (@cinny.bun.how)
Bsky thread: Dan Abramov AMA
Article: If I wrote a linter, part 1 (Joshua Goldberg)
Article: Plaid migration to Deno Deploy
Article: Pinterest Flow to TS migration
Article: Converting values to strings (2ality)
Library: Immaculata
Library: vue-route-query
Tool: Sapling SCM
Article: Ductless Ceiling Cassettes
Video: Quantum computing explainer (3blue1brown)
Video: ed text editor (Kay Lack)
Website: Game Icons

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

Building Games in TypeScript | Erik Onarheim | Ep 15B

1 maj 2025 | 53 min

TSGo Gets Autocomplete and JSX Support | News | Ep 15

29 april 2025 | 28 min

Are We Sick of TypeScript.fm Yet? | Retrospective | Ep 14B

24 april 2025 | 59 min

TC39 Enums in JS Proposal Moves to Stage-1 | News | Ep 14

23 april 2025 | 12 min

DOOM.ts | Dimitri Mitropoulos | Ep 13

16 april 2025 | 85 min

This week on the pod, we talk to Dimitri Mitropoulos about building DOOM in the TypeScript type system. We walk through all the nitty gritty and explore this truly amazing engineering feat! We touch on things that Dimitri learned and discovered along the way, and how you might be surprised what you can accomplish by trying! In the news, Zod 4 Beta drops with awesome new features.

Chapters

(00:00) - Intro
(00:37) - SquiggleConf 2025
(01:00) - Personal News
(04:28) - Dimitri's Background and Michigan TypeScript
(08:35) - JSON Parser in TypeScript Types
(09:08) - Where do you start with DOOM in Types?
(10:01) - "DOOM" Complete
(13:57) - How do you run DOOM in TS?
(17:36) - Debugging an Emulator in TS Types
(19:22) - How does DOOM work?
(20:45) - Using Web Assembly
(22:49) - Understanding WebAssembly and TypeScript Integration
(24:59) - The Concept of Abstraction in Programming
(27:02) - Challenges in Implementing WebAssembly from the Spec
(28:59) - Ambiguities in Specifications and Their Impact
(30:40) - Debugging Techniques and Error Handling
(32:24) - Innovative Use of Overflow in Game Development
(35:40) - Insights Gained from TypeScript During the Project
(38:24) - The Complexity of TypeScript Types
(43:08) - Time Travel Debugging and Memory Management
(45:00) - The Most Challenging Aspects of the Project
(48:32) - Reactions to DOOM
(53:10) - The Dawn of TypeScript Go
(01:02:14) - Lessons Learned and Future Directions
(01:08:37) - Dimitri Says Goodbye!
(01:09:50) - News for the Week of April 7th
(01:14:42) - Community Posts
(01:17:39) - Secret of the Handbook
(01:19:07) - Cool Stuff from Erik
(01:19:51) - Debugging and Performance Optimization Techniques

Dimitri's Links

News Links

Zod 4 Beta
Matt Pocock's Video
Dan Abramov - RSCs or Maybe Not
- https://overreacted.io/react-for-two-computers/
- https://youtu.be/ozI4V_29fj4
Axel’s Corner
- Testing Types
  - https://2ality.com/2025/04/testing-types-typescript.html
  - https://bsky.app/profile/dr-axel.de/post/3lmmwp4ovek2q
- Deploying TypeScript (timely!)
  - https://2ality.com/2025/04/deploying-typescript-present-future.html
https://www.pipe0.com/blog/never-in-typescript
https://www.typescriptlang.org/docs/handbook/2/conditional-types.html#distributive-conditional-types
Kamran
- https://bun.sh/blog/debugging-memory-leaks
- Animate UI: copy paste or installable components built with TS, React, and Tailwind using Motion.
Erik
- VGM Con
- Shader Programming Talk
- Sebastian Lague - Simulated CPU
  - https://youtu.be/HGkuRp5HfH8?si=9iNm0Ad1z4T4AePj
- Sebastian Lague - Rendering Text
  - https://youtu.be/SO83KQuuZvg?si=uzPojhUqBvV35q7F

Excalibur Games

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)

Creators & Guests

Enums in JS, Deno v Oracle Cage Match, and Parcel Gets React Server Components | Grab Bag | Ep 12

8 april 2025 | 31 min

Baby Got Bun | Ep 11

31 mars 2025 | 61 min

This week on the pod, we talk all about the Bun runtime funtimes! This is a powerful new player in the JavaScript and TypeScript runtime space focusing on DX, speed, and pushing the state of the art! We dive into the details and offer some of our thoughts around when to use it at the moment. In other news we avoid phone scams and talk fun new TypeScript libraries.

Also Please email us your feedback for your retro episode (feedback at typescript.fm)

Personal News

00:36 Welcome
01:33 Kamran & Erik IRL
- Minnebar
- VGM Con
02:39 Erik @ C Fundamentals by Frontend Masters
- FFM
02:55 Vibe Coding
03:43 LLMs "what are they good for?!"
04:31 Kamran's New Course
06:16 Kamran Review book on Time Freedom
07:31 Scams and Phone Calls
- FTC Warning about fake Jury Duty

(09:26) News for the Week of March 17, 2025

09:34 Next.js 9.1 CVE
- PR with fix
- Ed's Video on this @ Low Level Learning
10:43 Deno 2.2.5
11:13 Deno Patch Functionality
11:59 Deno FFI Docs Update
13:04 PandaCI: A New CI/CD Tool
16:17 HKT Core

(17:33) Community Highlights

17:33 TS Go GitHub Discussion on Compiler API
18:24 Deno Compile Vite
20:07 Blog Post by Andy Jiang about Deno+OTel
22:35 Cory House on Implementing Immutability in TypeScript
23:16 RGSTRY for managing decorator metadata
24:19 Corepack removal from Node, Sarah has a good overview

Bun Deep Dive

27:22 Introduction to Bun Runtime
- Baby Got Back by Jonathan Coulton
28:01 What is Bun
28:23 Bun vs Node.js and Dino
29:25 Features and Capabilities of Bun
30:40 Bun Performance
31:23 C Tangent
32:12 Bun DX
35:20 Standalone Executable
35:53 Use Cases for Bun
38:00 Cautions and Considerations
41:38 Good Use Cases
46:24 Bun Community
- This OP asked about Bun and ended up moving to Deno actually
- Memory Leaks
- Reddit threads
48:09 Conclusions

Outro

52:00 Cool Stuff This Week
58:11 Give Us Feedback (feedback at typescript.fm)

Other Links

Profiling TypeScript in VSCode
Cobol Based UI
https://github.com/oven-sh/awesome-bun
Chess in TypeScript types
Developer Speak

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)

Creators & Guests

Erik Onarheim - Host
Kamran Ayub - Host

The Vanilla TS Experience | Josh Goldberg | Ep 10

24 mars 2025 | 57 min

In this episode, we are joined by special guest Josh Goldberg to teach us about getting started with TypeScript from scratch. If you're new to TS, this is a great introduction! And if you've been using TS for a long time, you can explain to your friends where they should start to make their experience smoother. In the news, Nx gets support for project references and we curate some of the best TSGo content.

(00:36) Personal News

IRL: Excalibur.js team will be at VGM Con (April 11-13, Minneapolis, MN)
IRL: Erik is speaking at NDC Oslo (May 19-23)

(04:28) Introducing Josh Goldberg

(07:10) - Josh's Work as a Full-time Open Sourcer
(09:05) - Getting Started with TypeScript
- Start with the TypeScript Handbook (it's free!)
- Then, play with TypeScript in the playground
(10:57) - Pain Points for New TypeScript Developers
(12:41) - Benefits of TypeScript for Experienced Developers
(14:43) - Getting Started with TypeScript
(17:57) - CTA - create-typescript-app
- v2 rewrite spawned Bingo, dev tooling automation blocks
(20:54) - Use Cases For Create TypeScript App
(26:58) - CTA Plans for the Future
(29:10) - Learning Resources for TypeScript
- Matt Pocock (Total TypeScript)
- Cory House (Getting Started with TypeScript)
- Basarat (TypeScript Deep Dive)
- Code challenge: Advent of TS
- Code challenge: Advent of Code
- Code challenge: Type Challenges
(32:17) - And of course, Josh's Book: Learning TypeScript!
- Learn the why and theory
- Blog and articles
- Buy the book!
(33:30) - Favorite Language Feature: Discriminated Unions
(37:40) - Favorite Language Feature: Branded Types
(38:58) - Creating TypeScript ESLint Rules
(40:34) - Key Takeaways - Fun and Cool Stuff Happening!
- SquiggleConf 2025 CFP is open!
(42:29) - Future of TypeScript and Linting Innovations
- Write your own TS linter

(45:02) Where to Find Josh

(46:55) News for the Week of March 10, 2025

TSGo, but we already covered that (TS-a-Go-Go, Ep 9)
Deno 2.2.4 update adds enhancements to OpenTelemetry (OTel) support
Nx 20.5 adds TS project reference support
Cory House releases a new TypeScript course on Dometrain
React Router 7.3 minor release
- Experimental support for client contexts
- Experimental support for route middleware
(49:25) - Community Updates
- Dr. Axel's Corner - Dive deeper with this TSGO Explainer
- Sxzz (Kevin from Vite) created a TSGo playground with WASM
- TSGo community content

(54:55) Cool Stuff

Learn Zod to Trust your Data and your Types (h/t cassidoo)
50 Years of Travel Tips by Kevin Kelly
- "Your enjoyment of a trip will be inversely related to the weight of your luggage"
- "Crash a wedding. You are not a nuisance; you are the celebrity guest!"
TypeScript ESlint: Getting Started Docs
Everhood Game (Steam | Add to your Backlog)

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)

Creators & Guests

TS-a-Go-Go | Ep 9

17 mars 2025 | 53 min

React, TypeScript, and... Schbooleans? | Ep 8

10 mars 2025 | 68 min

ORMed and Dangerous | Ep 7

3 mars 2025 | 68 min

The Sheer Joy of Publishing to JSR | Ep 6

24 februari 2025 | 67 min

This week Kamran and Erik unpack JSR, the new open alternative to the npm registry from the folks at Deno. They both published packages and discuss what JSR offers npm doesn't, when to use it, and how it works for both consumers and maintainers.

(00:00) - The Sheer Joy of Publishing to JSR | Ep 6
(05:40) - News: TypeScript 5.8 RC
(07:45) - News: JSR Open Governance Board
(08:59) - News: ESLint Plugin for erasableSyntaxOnly
(11:03) - News: Windows Terminal 1.22 Released
(15:31) - News: Create React App is Officially Deprecated
(17:50) - News: Interop 2025
(19:59) - News: Prettier 3.5 Released With Better TS Support
(20:42) - Community Highlight: Wheel of Names TypeScript+React Project Tutorial
(21:05) - Community Highlight: Repository Pattern and Clean Architecture with TS and Prism
(21:34) - Community Highlight: Welch Canavan on the Sheer Joy of Publishing to JSR
(22:01) - Community Highlight: The Good Doctor is On a Roll
(22:47) - Community Highlight: Tips for Migrating Node.js Projects to Deno
(24:09) - Community Highlight: Sort Object Properties by Type ESLint Plugin
(24:30) - Community Highlight: Unloader and Unplugin for TypeScript and oxc
(25:21) - Community Highlight: dsbuild Bundler for Deno
(25:54) - Deep Dive: What is a Pirate's Favorite Registry?
(27:49) - Deep Dive: Differences Between npm and JSR
(30:38) - Deep Dive: JSR's Security-First Approach
(32:39) - Deep Dive: Consuming JSR Packages in the Browser
(35:26) - Deep Dive: Should You Publish to Both npm and JSR?
(36:31) - Deep Dive: Can You Publish Private Packages?
(38:16) - Deep Dive: JSR's TypeScript-First Approach
(42:04) - Deep Dive: Can You Tag Versions?
(44:51) - Deep Dive: No API Keys for Publishing
(46:58) - Deep Dive: Yanking or Unpublishing a Package
(48:16) - Deep Dive: Kamran's Experience Publishing to JSR
(53:16) - Deep Dive: Erik's Experience Publishing to JSR
(55:06) - Secrets of the Handbook: Decorators
(01:00:03) - Cool Stuff: Write Vanilla CSS in TypeScript
(01:00:32) - Cool Stuff: Signals in Lit
(01:01:35) - Cool Stuff: Train Your vim Muscle Memory
(01:01:52) - Cool Stuff: AreTheTypesWrong.com
(01:02:44) - Cool Stuff: Homura Ham's Hamster Maze Videos
(01:05:10) - Bonus: JSR ASMR (?!)

Week of February 10, 2025

TypeScript 5.8 RC Released -- Notably, the checked return expressions was walked back 🥹 But, it includes require(esm) support.
Deno announced the JSR Open Governance Board
Warn or emit lint errors if your TypeScript contains erasable syntax with Josh Goldberg's new ESLint plugin
Windows Terminal 1.22 released with support for Sixels graphics
Node 20 got require(esm) support backported.
PSA: Node 18 EOL is April 30, 2025
React team officially deprecates Create React App
Browser vendors met to discuss which APIs to implement between them at Interop 2025
Prettier 3.5 released with better TS support
Astro 5.3 has better overall performance and Netlify support

Community Highlights

Tutorial: FreeCodeCamp build a React and TypeScript Wheel of Names project
Video: Repository pattern and clean architecture with TypeScript / Prism (h/t Alex Rusin)
Blog post: The Sheer Joy of Publishing to JSR (h/t I. Welsch Canavan)
Blog post: Deno on npm: specifiers vs transpiled services like esm.sh
Via The Good Dr. Axel Rauschmayer
- Blog Post: extracting parts of composite types via `infer`
- Blog Post: A guide to tsconfig.json (Updated for TS 5.8)
- Blog Post: TypeDoc: testing code examples in comment docs
- Blog Post: Mapped Types
Discussion: dayjay migrated all their Node.js projects to Deno. What did they learn?
Tools: Nir Tamir created a TS ESLint rule for sorting object properties by type
Tools: Kevin Deng is working on Unloader & Unplugin
Tools: A new Deno Bundler (dsbundle)

Deep Dive: JSR

JSR, an open source npm alternative
JSR's Provenance Attestation for verification
Zero-config GitHub publishing
Doesn't yet support private publish (but there's a workaround)
No support in Artifactory yet
JSR will warn you of slow types
Kamran published ts-has-guards for guarding `Map.has` and related APIs
Erik published Excalibur's ECS core code for fun
JSR will score your package
No scope squatting (or selling)!

Secrets of the Handbook

Decorators
2ality's guide on decorators
TC39 updates presentation
oxc is working on support for modern and legacy

Links

Kat

Compilers, Runtimes, and Funtimes | Ep 5

17 februari 2025 | 64 min

This week Kamran and Erik try to dissect the complex landscape of JavaScript and TypeScript compilers, transpilers, interpreters, engines, and runtimes (oh my!). What are the tools, what are they used for, why is the world so complicated, and what should you care about as a TS developer?

(04:55) - This Week in TypeScript: Node.js Corepack Issue Affects Users
(06:16) - This Week in TypeScript: Vite and Vitest Security Vulnerabilities
(07:18) - This Week in TypeScript: 2ality on Enum Patterns
(08:51) - This Week in TypeScript: 2ality's Tutorial on Publishing ESM Packages with TypeScript
(09:53) - This Week in TypeScript: Should We Move On to ESM-Only?
(13:13) - This Week in TypeScript: HTTP2 Support Across Node.js, Bun, and Deno... Or Lack Thereof
(14:14) - This Week in TypeScript: Nx Has Some New TypeScript Monorepo Guides
(14:38) - This Week in TypeScript: Zero to Mastery Shares a TypeScript Cheat Sheet
(15:09) - This Week in TypeScript: TS Comment Directives
(17:21) - Deep Dive: Compilers and Runtimes
(19:32) - Deep Dive: What's the Difference Between a Compiler and Transpiler?
(21:11) - Deep Dive: Why Do We Need a TypeScript Compiler?
(22:02) - Deep Dive: The TypeScript Compiler (TSC)
(23:38) - Deep Dive: What's an Interpreter?
(25:06) - Deep Dive: What's an Engine?
(27:52) - Deep Dive: Recap So Far
(28:31) - Deep Dive: Babel, the OG Transpiler
(29:23) - Deep Dive: What is SWC?
(31:12) - Deep Dive: Using the verbatimModuleSyntax TSConfig Flag
(32:35) - Deep Dive: What is esbuild?
(34:23) - Deep Dive: Okay, What's the Difference Between SWC and esbuild?
(35:51) - Deep Dive: So, What is oxc Then??
(37:03) - Deep Dive: Erik Says checker.ts is "Gigundous" (???)
(37:58) - Deep Dive: Wait, oxc Can Output Type Declarations?!
(39:34) - Deep Dive: Writing Your TypeScript So It Compiles Faster
(41:10) - Deep Dive: What Does deno compile Do?
(42:12) - Deep Dive: What Are The Different JS/TS Runtimes?
(43:43) - Deep Dive: What Differentiates Bun from Deno?
(45:26) - Deep Dive: Serverless JavaScript Runtimes (workerd, Vercel Edge)
(46:48) - Deep Dive: Writing Isomorphic JavaScript or TypeScript
(47:44) - Deep Dive: Who Will Stop This Madness?
(50:11) - Deep Dive: Should Microsoft "Fix" TSC?
(53:43) - Deep Dive: WHAT DOES ALL THIS MEAN?
(57:36) - Secrets of the Handbook: Named Tuple Values
(01:00:59) - Cool Stuff: Node ES Language Support Matrix
(01:01:46) - Cool Stuff: VSCode Pretty TS Error Extension

Week of February 3, 2025

📌 PSA: Node.js LTS corepack registry key signing issue breaks people's CI/CD pipelines and npm/pnpm installations. If you are affected, check this issue out! It’s fixed now and backported to Node 20.18.3.
📌 PSA: There was a remote code execution vulnerability in Vitest, and a Vite dev server vulnerability. Update to the latest patch versions!

Community Highlights

Blog Post: TypeScript enums: use cases and alternatives (Axel Rauschmayer)
Blog Post: Tutorial: publishing ESM-based npm packages with TypeScript (Axel Rauschmayer)
Blog Post: Move on to ESM-only (Anthony Fu)
Blog Post: Fetch and HTTP/2 support in Node.js, Bun and Deno (George Haidar)
Learning: Nx is doing cool stuff for TS monorepo setups and has a whole series on it
Cheatsheet: Bookmark this TypeScript Cheat Sheet by Zero to Mastery (PDF version available)
Book: Joshua Goldberg has a new Learning TypeScript book and shares a tip about TS comments

Compilers and Runtimes Deep Dive

The JavaScript Runtime Environment (Jamie Uttariello)
Wikipedia: ECMAScript Engines
V8's interpreter, Ignition
Hermes engine for React Native
TSC, the official Microsoft TypeScript compiler
SWC, a Rust-based compiler for JavaScript and TypeScript
esbuild, a Go-based compiler for JavaScript and TypeScript
oxc, a (new) Rust-based compiler by the creators of Vite
Deno compile for creating binary executables
Bun runtime, a drop-in replacement for Node
workerd runtime by Cloudflare
Vercel Edge Runtime
A list of WebAssembly (WASM) runtimes
WinterTC, a committee for unifying server backend runtime APIs

Links

TypeScript 4.0's labeled tuple elements (playground link)
Wondering what version of Node supports what ES features and syntax? https://node.green/
Replace those ugly TS errors in VSCode with something more pretty

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)

Creators & Guests

Kamran Ayub - Host
Erik Onarheim - Host

You Say Vite, I Say Vite | Ep 4

10 februari 2025 | 54 min

This week Erik and Kamran talk about Vite (Vight? Veet?), what it's good for, how it works, and its status as the "go-to" tool for frontend tooling.

(04:21) - This Week in TypeScript: TS 5.8 Beta
(11:02) - This Week in TypeScript: Ruck 9 Released
(12:39) - This Week in TypeScript: Type Stripping in the Browser
(14:45) - Community Highlight: Deno and Qwik Video
(15:52) - Community Highlight: Zig, TypeScript, and WASM by David Bushell
(16:49) - New Library Watch: tsc-extra
(17:24) - New Library Watch: typemap and typebox
(18:23) - Vite Overview
(22:01) - Vite: Getting Started
(22:53) - Vite: build and preview
(23:34) - Vite: How Does It Work?
(26:57) - Vite: Support for Libraries and Frameworks
(28:04) - Vite 6.0: Environments API
(30:27) - Vite 6.0: Support for Additional HTML Asset References
(31:28) - Vite: Testing with Vitest
(32:48) - Vite Gripes and Gotchas
(33:52) - Vite Gripes: Dev and Prod Build Inconsistencies
(35:14) - Vite Gotcha: Forgetting to Set a URL Base
(35:49) - Vite Gotcha: Targeting Legacy Browsers
(38:30) - Vite Gripes: npm linking
(41:43) - Vite's Future: What Are We Excited About?
(44:12) - Secrets of the Handbook: Type Guards and Predicates
(47:27) - Cool Stuff: Write Typesafe Emails with React.email
(49:51) - Cool Yet Questionable Stuff: Custom Type Errors When Working With Generics

Week of January 27

News: TS 5.8 Beta Released
News: Ruck 9, a Deno web framework
News: Guy Bedford releases es-module-shims@2.0, allowing type stripping in the browser
Community: Qwik and Deno (📸 Video)
Community: Benchmarking Zig, TS and WASM by David Bushell (✍️ Blog Post)
New Libraries
- tsc-extra
  - Static analysis tool, type checking only, no code generation or compiling
  - Useful for documentation or lower-level TS tools
- Typemap is like a Zod alternative, built for TypeBox
  - “It offers a common TypeScript syntax for type construction, a runtime compiler for high-performance validation and type translation from one library to another.”

Vite Deep Dive

Homepage
Evan You's State of Vite 2023 Keynote (📸 Video)
Why Use Vite?
Vite 6 Updates
Sapphi-Red's Increasing Vite's Potential With the Environment API (✍️ Blog Post)
Vite's browser compatibility
Vite's future, bundling with Rolldown

Links

Handbook: Type Guards and Predicates
Send typesafe emails with React.email
Better string literal errors (📸 Video)

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)

Creators & Guests

Kamran Ayub - Host
Erik Onarheim - Host

We Don’t Talk About Deno-no-no | Ep 3

3 februari 2025 | 52 min

This week Erik and Kamran make poor dad jokes, talk about Deno, and tour its ecosystem. If you're new to Deno, this will be a great introduction!

(00:00) - We Don't Talk About Deno-no-no-no | Ep 3
(06:54) - This Week in TypeScript: Bun 1.2 Released
(10:54) - This Week in TypeScript: 5.8's ErasableSyntaxOnly Flag
(14:57) - This Week in TypeScript: Tailwind 4 Released
(16:26) - This Week in TypeScript: Vitest 3 Released
(17:17) - Errors and Corrections
(18:46) - Deep Dive Into Deno
(22:19) - Deno's Integrated CLI
(23:50) - Deno CLI: deno run
(24:28) - Deno CLI: deno add, install, remove, uninstall
(25:01) - Deno CLI: deno task
(26:19) - Deno CLI: deno test
(27:18) - Deno CLI: deno fmt, deno lint, and deno check
(28:15) - Deno CLI: deno serve
(29:26) - Deno CLI: deno doc
(30:07) - Deno CLI: deno bench
(31:24) - Deno's Standard Library
(33:21) - Deno CLI: deno compile
(36:24) - Deno's Performance
(37:32) - What is Deno Fresh?
(38:17) - What is JSR?
(39:43) - What is Deno Deploy?
(40:38) - Moving from Node to Deno as a Developer
(45:48) - Deno CLI: deno upgrade
(47:13) - What Are We Excited About In the Future With Deno
(48:13) - Secrets of the Handbook: TSConfig's extendedDiagnostic
(50:12) - Cool Stuff: Serve a Folder in a Single Deno Command
(50:44) - Cool Stuff: Flappy Bird Clone in Deno Compile

News

Deno Deep Dive

Deno’s 2024 in review blog post
Rusty v8 -- Rust bindings for V8
Deno CLI docs
Performance
Deno Fresh
JSR
Deno Deploy
Kamran's Advent of Code 2024 repo using Deno

Links

Learn Vim’s keyboard shortcuts with Vim Adventures
Minnesota's Art Shanty Projects during the winter
Secrets of the Handbook: TSConfig – extendedDiagnostics
Alias to serve a folder using a single Deno command like npx serve (h/t Kamran)
Deno Compile video with Flappy Bird

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)

Creators & Guests

Kamran Ayub - Host
Erik Onarheim - Host

Node 23 Gets TypeScript Support, Mostly | Ep 2

27 januari 2025 | 37 min

In this episode, Kamran and Erik discuss the newly released TypeScript support with Node 23.6 and its implications. What's supported? What's not supported? And how does it differ from Bun or Deno?

(00:00) - Ep 2 - Node 23 Gets TypeScript Support
(00:05) - Introduction
(04:04) - TypeScript News and Announcements
(10:27) - A Closer Look at Type Stripping for Node 23
(22:56) - Differences Between Node 23 and Deno 2
(30:22) - Cool TypeScript Stuff

News

Everything You Need to Know About Node.js Type Stripping by Marco Ippolito
- Node 23.6.0 Release Notes -- The one with TypeScript support
- Docs: Node 23 “Modules: TypeScript”
- Node's new built-in support for TypeScript by Dr. Axel Rauschmayer
Native Typescript support coming to Eleventy by Zach Leatherman (PR)
ESLint 9.18 – Zero-config TypeScript support by Andrey Sitnik
TypeScript 5.8: Erasable Syntax Only
PSA: Create React App doesn’t work with React 19, use Vite!

Errata

19:11 -- We incorrectly assumed that TSC is used for the transpilation in Node 23, but that's not true. SWC still handles the transpilation (if the flag is used) so Node's TypeScript support does not rely on TSC at all. Reported by: Marco Ippolito

Cool Stuff

Jiti: A Node.js package for ESM and TypeScript support
Example of `satisfies never` with switch statements by Cecile Muller, Bluesky
- What is the “satisfies” type constraint? By Matt Pocock
Dockview – npm package for a TypeScript native window manager
Using “as const” for config typing by Matt Pocock

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)

Creators & Guests

Kamran Ayub - Host
Erik Onarheim - Host

Two TypeScript Fools, One Podcast | Ep 1

27 januari 2025 | 43 min

TypeScript.fm – The Friendly Show for TypeScript Developers

Avsnitt

TypeScript Native is Now in Preview | News | Ep 19

Microsoft Layoffs Impact TypeScript Team | News | Ep 18

What's New in Node 24 | Deep Dive | Ep 17B

Node 24 Officially Brings TS Support to the Masses | News | Ep 17

Deno 2.3 Ships Tons of QOL Improvements | News | Ep 16

Building Games in TypeScript | Erik Onarheim | Ep 15B

TSGo Gets Autocomplete and JSX Support | News | Ep 15

Are We Sick of TypeScript.fm Yet? | Retrospective | Ep 14B