Dan Vanderkam 🦋
@danvdk
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Independent software developer, formerly @sidewalklabs and Google. Author of Effective TypeScript, now in its 2nd edition (May 2024): https://t.co/NV5HD4jX8C
Hudson Valley, NY
Joined February 2009
It's here! 🎉 The 2nd edition of Effective TypeScript is now available in all formats. The bird on the cover is the same, but the content is throughly revised and expanded to reflect how TS is used in 2024. Get your copy today! @OReillyMedia
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Just published a big update to my "X-Ray Glasses for any types" VS Code extension: It uses the built-in TypeScript server now, which makes it faster and more likely to work with your project. Give it a try! It found some anys in vscode and tsc itself!
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RT @_ndeyefatoudiop: Just started reading the 2nd edition of this book 🎉. I can’t recommend it enough! The first version made me an entire….
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For a weekend project, I wrote a VS Code extension: X-Ray Vision for any types. The scary thing about "any" is that it can appear in surprising place and silently spread. No more! This was frustrating, rewarding, and hopefully useful. Give it a try!
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This is the single passage of Effective TypeScript that I've received the most feedback on. Do you have an intuition for why these relationships hold? The latest blog post walks through how they work, what they mean, and why they're interesting
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I learned Zig for last year's Advent of Code. It's a nice language with some great ideas, and TypeScript could learn a few things from it. Read on!
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My notes on the changes in TypeScript 5.5, a blockbuster release
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@recursecenter @AndaristRake or if you prefer videos, check out the great discussion that @JoshuaKGoldberg and I had with Dimitri from @MiTypeScript
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I'm very excited that TS 5.5 has officially landed with Inferred Type Predicates, the feature I built at @recursecenter earlier this year. Read all about the journey at Special thanks to @AndaristRake for fixing all my bugs :).
TypeScript 5.5 is now available! 🎉✨. Now with. ✅ Inferred Type Predicates.✅ RegEx syntax checks.✅ The JSDoc @import Tag.✅ ${configDir} for easier tsconfig inheritance.✅ --isolatedDeclarations.✅ Lots of new optimizations. And more! Try it today!.
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Effective TypeScript Item 36: Use a Distinct Type for Special Values. This is a sample from the newly-released second edition. It discusses a common mistake in TypeScript code: using "", 0, or -1 to represent special cases like missing data.
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RT @JoshuaKGoldberg: TypeScript 5.5's going to be a BANGER, and the headliner feature for a lot of us that I'm SO EXCITED about is because….
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If you want to learn the backstory of TypeScript 5.5's inferred type predicates, this is the video! I'm really happy with how it turned out. Kudos to Dimitri and @JoshuaKGoldberg for putting it together.
🤩 a super long-requested @typescript feature is coming in a few days to v5.5: @danvdk's work on inferred type predicates! So, naturally, we did a deep dive on it with Dan, the PR author himself!. video link below👇
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RT @JoshuaKGoldberg: This is the thing! We're launching!. I'M CO-ORGANIZING A CONFERENCE THIS YEAR!!!!. SO MUCH WORK has gone into it and I….
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RT @johnny_reilly: I'm always excited by a TypeScript release. This one is epic, and what's all the notable is how much community involveme….
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Very excited to see inferred type predicates headline TS 5.5! I hope everyone enjoys the bird-themed release notes 🦜.
Announcing TypeScript 5.5 Beta! 📣. Now with type predicate inference, more type narrowing, an @import tag for JSDoc, the --isolatedDeclarations flag, performance & reliability improvements, and much more!.
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This has been on my list of most-desired TS features for years. I’m genuinely curious to see what breaks under —strictReadonly. In 2016 this felt too strict, but in 2024 it’s surprising we don’t have this.
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One of my goals this year was to become a TypeScript contributor. Over the past three months, I did just that! This post tells the story of how Type Predicate Inference came about and what I learned along the way.
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Excited to see that the new Flow Node Charts have at least one high-profile user. And may have even indirectly led to some TypeScript speedups! Visualizing something has a way of nudging you to make it better. @DavidSherret
For my PR to infer type predicates, I needed to understand TypeScript's control flow graph. So I added a graph visualization to @DavidSherret's amazing TypeScript AST Viewer. It's live now and very fun to play with! Edges go backwards in execution order.
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