Progress on TypeScript 7, Advent of Code as an Excuse to Learn Zig, and Type-safe CLIs | News | Ep 46

News for the week of November 24, 2025: TypeScript team discusses progress on TS 7 and upcoming deprecations for TS 6. Plus, Svelte's new hydratable API. From the community: creating strongly-typed CLIs with yargs, magic union types to check characters, and how TypedArray can reduce memory usage.

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

Chapters

• (00:00) - Welcome to the Show
• (05:21) - News: Progress on TypeScript 7 and Upcoming Deprecations
• (15:24) - News: Advent of Code is Live for Holiday Coding
• (17:07) - News: Svelte 5.44.0 Introduces hydratable API
• (19:18) - News: Vite+ FAQ Answers Some Common Questions
• (20:21) - News: Zed IDE Adds Better TS Error Messages
• (22:01) - News: TypeScript ESLint Will Simplify Redundant Type Unions
• (22:24) - Library Watch: Spikard, a Polyglot API Toolkit
• (23:31) - Library Watch: Type-safe CLIs with Optique
• (24:09) - Community Highlight: The Summer I Shipped Type Stripping by Marco Ippolito
• (25:51) - Community Highlight: Building Strongly Typed CLI Applications by John Reilly
• (27:10) - Community Highlight: Using Zod and TypeScript by Telerik
• (27:45) - Community Highlight: Lowercase & Uppercase Union by TypedRocks
• (28:32) - Community Highlight: Improving Bazel Type Checks with Isolated Declarations by Brad Zacher
• (29:28) - Community Highlight: Data-oriented Modeling by Aapo Alasuutari
• (32:01) - Community Highlight: Doom in TypeScript Types by Software Engineering Daily
• (32:17) - Bleet of the Week
• (32:45) - Cool Watch: Human-sized Lego Castle with 3D Printing
• (33:42) - Cool Watch: Predators (2010)
• (34:24) - Cool Watch: dotnetconf Talks
• (37:20) - The Minnesota Long Goodbye

News

• TypeScript Blog: Progress on TypeScript 7
• Advent of Code is live!
• Svelte 5.44.0 introduces `hydratable` API
• Vite+: New FAQ
• Zed v0.214.0, now with better TS Errors
• TypeScript-ESLint 8.48.0 adds type union redundancy check
• Library Watch: spikard, a polyglot API toolkit
• Library Watch: Optique 0.7.0 (via Hong Minhee)

From the Community

• Marco Ippolito: Summer I Shipped Type Stripping
• John Reilly: Yargs: statically typed builder commands (via johnnyreilly)
• Telerik: Zod + TypeScript: Schema Validation Made Easy
• TypedRocks: The Secret Power of The Lowercase & Uppercase UNION in TypeScript
• Brad Zacher: Improving Bazel TypeScript TypeChecks With IsolatedDeclarations (via Rob Palmer)
• Aapo Alasuutari: Interlude: A data-oriented model
• Software Engineering Daily: Josh and Dmitri talk about Doom in TypeScript Types

Cool Links

• Cool Watch: NFTI building a 3D printed castle
• Cool Watch: Predators (2010)
• Cool Watch: dotnetconf
• Cool Link: Aspire.dev, code-first local dev environments

Music
Seahorse Dreams by Kubbi (Spotify)