TypeScript.fm - The Friendly Show for TypeScript Developers

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 CourseOut 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.jsExcalibur.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.comMake Your First Game in 10 MinutesJoin the Discord: https://discord.gg/9UemP985UyChapters(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 NewsExcalibur.js V0.32.0 holiday releaseTSGo PR #2343 adds experimental decorators supportMicrosoft: Announcing the JavaScript/TypeScript Modernizer for VS CodeNext.js 16.1 adds Turbopack improvementsBun: 1.3.5 release terminal simulator (PTY) and compile-time feature flag dead-code eliminationStandard Schema V1 release (h/t ArkType and Josh Goldberg) Library Watch: https://www.npmjs.com/package/numpy-tsLibrary Watch: Lulzx/tinydocx: Minimal DOCX/ODT creation libraryLibrary Watch: Lulzx/tinypdf: Minimal PDF creation libraryFrom the CommunityLiran Tal: NPM Security Best Practices: How to Protect Your Packages After the 2025 Shai Hulud AttackThiery 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 TypeScriptCool LinksCool 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 WiiCool Tool: rsdoctor is a bundle analyzer for Rspack-family of tools (and webpack!)MusicSeahorse Dreams by Kubbi (Spotify)

News for the week of December 8 2025: Deno 2.6 is packed with some cool features, Node 24 LTS ships stable type stripping, more React CVEs, and some new browser updates. From the community: JSDoc love, slay your TS type performance, and Figma's plugin system is built on shadows.MCP in Practice CourseOut 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.jsExcalibur.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.comMake Your First Game in 10 MinutesJoin the Discord: https://discord.gg/9UemP985UyChapters(00:00) - Welcome to the Show (06:13) - News: TypeScript 6.0 Will Remove the module Keyword (07:57) - News: Node 24 LTS Now Has Stable Type Stripping (08:49) - News: npm Has Revoked Classic Tokens (09:41) - News: Deno 2.6 Adds dx Command, TSGo Support (12:42) - News: Follow-up CVEs for React and Next.js (15:29) - News: Safari 26.2 Updates (18:36) - News: Chrome 144 Beta Ships Temporal API (19:17) - Library Watch: Kysera, Type-safe Data Access Toolkit (20:36) - Library Watch: Elysia, a Backend TS Framework (22:49) - Library Watch: multithreading.js, the Missing Standard Library for Concurrency (24:43) - Library Watch: typedriver, for Runtime Type System Integration (26:53) - Community Highlight: Typeslayer, Debugging Type Performance (28:32) - Community Highlight: JSDoc *is* TypeScript by culi (30:24) - Community Highlight: Call to Sponsor ESLint by Nicholas Zakas (30:47) - Community Highlight: Typing Cypress Aliases by Gleb Bahmutov (31:54) - Community Highlight: Figma's Plugin System (34:52) - Community Highlight: Vite 8 Now Reports Slow Plugins (35:11) - Community Highlight: machine, a TypeScript State Machine Library (35:54) - Community Highlight: Dino Runner Game in Deno, Part 2 (36:32) - Community Highlight: ArkType and Zod Creators Team Up (36:57) - Secret of the Handbook: String Literal Template Types (38:23) - Cool Game: Moomintroll Game on Steam (39:01) - Cool Link: Slop Detective by Kagi (39:29) - Cool Conference: NDC Toronto is Announced (40:11) - Cool Code: Tiny Physics in JS (41:19) - Cool Tool: Perro Engine Can Transpile C#/TS to Rust (42:41) - The Minnesota Long Goodbye NewsTypeScript: In 6.0, you can’t use `module ns` use `namespace ns`Node.js: Type Stripping is marked stable in Node 24 (LTS) release linenpm has revoked classic tokens but there are still risksDeno 2.6: dx is the new npx React Security: Denial of Service and Source Code Exposure in React Server Components WebKit Features for Safari 26.2 Chrome 144 Beta: Getting the Temporal APILibrary Watch: Kysera – type-safe data accessLibrary Watch: ElysiaJS – end-to-end typing web framework built on BunLibrary Watch: multithreading.js – The missing standard library for multithreading in JavaScript (Works in the browser, Node.js, Deno, Bun) Library Watch: Typedriver – sinclairzx81/typedriver: High Performance Driver for Runtime Type System Integration From the CommunityDimitri and MiTS: TypeSlayer - a TypeScript types performance tool  🤘 Culi: JSDoc *is* TypeScriptNicholas Zakas: ESLint Needs Sponsors Gleb Bahmutov: How To Type Function Mocha Context With Cypress Aliases Figma: How We Built Figma's Plugin SystemDoeixd: machine – compile-time safe state machineDeno: Build a dinosaur runner game with Deno, pt. 2 Kobi Hari: How Did I Miss This After 5 Years: TypeScript’s String Literal TemplatesCool LinksMoomintroll Winters Warmth Slop Detective from KagiNDC is coming to Toronto! Tiny JS physics Perro – a Rust game engine that transpiles C#/TS for game logicMusicSeahorse Dreams by Kubbi (Spotify)

Sam Gammon joins the two fools to talk about Elide, a batteries-included multi-language runtime. What if you could import Python modules from TypeScript... or Ruby, or Kotlin, or Rust? What if you could consolidate multiple backends to just one that ran all your code end-to-end with a unified DX? And what if doing all that was just as fast (or faster) than your existing backend? That's what we talk about in this episode!ResourcesElide on GitHubElide docsJoin the Elide Discord serverWhere to Follow the TeamSam on GitHubSam on XChapters(00:00) - Introducing Elide, a Multi-language Runtime Built on GraalVM (03:51) - Why Support Multiple Languages? (07:42) - What is GraalVM, anyway? (09:43) - What are the Languages Elide Supports Today? (10:53) - How Does Elide Interop Between Languages? (14:03) - What Magic Allows TypeScript to Import a Python Module? (16:12) - How Does Elide's API Compare to Other Runtimes? (18:26) - Elide's Embedded Inference Engine and API (20:11) - How Does Elide Handle Idioms Like Promises? (22:39) - What About Single- vs. Multi-threading? (24:41) - What About Concurrency and Isolation? (28:33) - Does Elide Help with Serverless Cold Starts? (29:25) - Can Elide Compile Single-file Executables? (31:06) - How is TypeScript So Fast in Elide? (33:34) - Can We Start Building with Elide? (35:14) - How Do You Debug Across Multiple Languages? (38:13) - Where Does Elide Really Shine? (40:56) - How is Elide Planning to Win? (42:53) - Could Elide Support a Native Runtime Type System? (45:26) - Takeaways and Where to Learn More Sponsored by Excalibur.jsExcalibur.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.comMake Your First Game in 10 MinutesJoin the Discord: https://discord.gg/9UemP985UyMusicSeahorse Dreams by Kubbi (Spotify)

News for the week of December 1, 2025: Anthrophic acquired Bun, React2Shell is pretty darn bad (and that's not all), plus "elf spam" packages on npm. From the community: tRPC vs. oRPC, demystifying TSConfig, and hash-slash (#/) project-relative import support in Node.MCP in Practice CourseWatch 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.jsExcalibur.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.comMake Your First Game in 10 MinutesJoin the Discord: https://discord.gg/9UemP985UyChapters(00:00) - Welcome to the Show (04:09) - Kamran's MCP in Practice Course is Now Live on Pluralsight (08:35) - News: Anthropic Acquires the Bun JavaScript Runtime (13:41) - News: Vite 8 Beta with Rolldown (15:40) - News: tsdown 0.17 Release (17:10) - News: oxlint Brings Type-aware Linting in Alpha (17:50) - News: oxfmt Alpha is 30X Faster Than Prettier (18:45) - News: Gird Your Loins for Upcoming Node.js Security Releases (19:38) - News: React2Shell Remote Code Execution Exploit in RSC (26:55) - News: React2Shell Causes Yet Another Cloudflare Outage (28:16) - News: Santa's Elves Flood npm With Naughty "Gifts" (30:10) - News: SVG Clickjacking Exploit Using Filters (32:05) - Community Highlight: tRPC vs. oRPC for Your Next TypeScript Project? (33:15) - Community Highlight: Testing Vue Composables in TypeScript by John Franey (34:03) - Community Highlight: Formisch for React Quietly Released by Fabian Hillar (34:53) - Community Highlight: Building a Dinosaur Runner Game in Deno (36:19) - Community Highlight: Node Will Soon Support Project Root Import Paths (37:51) - Community Highlight: TSConfig Grimoire by Bjorn Lu (39:01) - Community Highlight: How is ESM vs. CJS Going? by Titus (40:45) - Community Highlight: Next Astro Release Supports Vite Environments API (41:18) - Bleet of the Week by Joke Bailey (42:10) - Cool Read: Godot Shaders Bible by Fabrizio Espendola (42:56) - Cool Watch: Cancellation Tokens by Stephen Toub (43:44) - Cool Game: Classic Game Zork is Released as Open Source (44:16) - Cool Tool: Helion, a Modern DOOM Engine (45:18) - Cool Watch: Modern .NET Serialization Attacks by Hampton Paulk (47:25) - Cool Reads: Architecture for Flow and Domain-driven Transformation (48:40) - The Minnesota Long Goodbye NewsBun: Bun is joining Anthropic ViteLand: Vite 8 Beta: The Rolldown-powered ViteViteLand: Announcing Oxlint Type-Aware Linting AlphaViteLand: The first Oxfmt alpha was releasedViteLand: tsdown got a new releaseNode.js PSA: Prepare for Monday, December 15, 2025 Security ReleasesCloudflare: Cloudflare outage on December 5, 2025Security: npm Sees Surge of Auto-Generated “elf-stats” Packages Published Every Two Minutes via (Sarah Gooding)Security: SVG Filters - Clickjacking 2.0 Ʊ lyra's epic blog React2Shell ResourcesReact2Shell Exploit: Critical Security Vulnerability in React Server ComponentsDeep Dive: https://react2shell.com/Next.js: Security Advisory: CVE-2025-66478Deno Blog: React Server Functions / Next.js Vulnerability: Deno Deploy users protected Explainer: this is the worst case scenario by LowLevelEdFrom the CommunityTemitope Oyedele: tRPC vs oRPC: Which is better for your next TypeScript project, and why?John Franey: How to test a Vue composable with TypeScript · JohnFraney.caFabian Hiller: Formisch for React just released (quietly) – the form library that powers SolidJS Deno: Build a browser game in Deno Hybrist: Node support for #/ wildcard (via Rob Palmer)Bjorn Lu: TSConfig Grimoire (via Rob Palmer)Wooorm: How is ESM from Common going?Astro: Next release of Astro will support Vite Environment APICool LinksCool Read: Godot Shaders Bible and Ghastly in Desmos by Fabrizio EspindolaCool Watch: Cancellation Tokens with Stephen ToubCool Game: Preserving code that shaped generations: Zork I, II, and III go Open Source Cool Tool: Helion Engine, a modern DOOM engine in C#Cool Watch: Modern .NET Serialization Attacks by Hampton PaulkCool Reads: Architecture for Flow and Domain-driven TransformationMusicSeahorse Dreams by Kubbi (Spotify)

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.jsExcalibur.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.comMake Your First Game in 10 MinutesJoin the Discord: https://discord.gg/9UemP985UyChapters(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 NewsTypeScript Blog: Progress on TypeScript 7Advent of Code is live!Svelte 5.44.0 introduces `hydratable` APIVite+: New FAQ Zed v0.214.0, now with better TS ErrorsTypeScript-ESLint 8.48.0 adds type union redundancy checkLibrary Watch: spikard, a polyglot API toolkitLibrary Watch: Optique 0.7.0 (via Hong Minhee)From the CommunityMarco Ippolito: Summer I Shipped Type StrippingJohn 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 modelSoftware Engineering Daily: Josh and Dmitri talk about Doom in TypeScript TypesCool LinksCool Watch: NFTI building a 3D printed castleCool Watch: Predators (2010)Cool Watch: dotnetconfCool Link: Aspire.dev, code-first local dev environmentsMusicSeahorse Dreams by Kubbi (Spotify)