Dan Vanderkam 🦋

Independent software developer, formerly @sidewalklabs and Google. Author of Effective TypeScript, now in its 2nd edition (May 2024):

[Dan Vanderkam 🦋 @danvdk]

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 https://t.co/BivGuCs0vp

[Dan Vanderkam 🦋 @danvdk]

Great article from @ollie about my long-running quest to find the highest-scoring Boggle board. I love the visuals! https://t.co/wvvq4KQxOC

[Nadim @0xNadim1]

writing typescript for the first time in 6 years, and i think im enjoying it? new additions like type predicates inference make for a much nicer devex

found a very cool article too documenting the development process of this feature from @danvdk
https://t.co/lxpIFSVb30

[Dan Vanderkam 🦋 @danvdk]

@StatisticsFTW @bradzacher Thanks! Curious how it works for you. Right now I think it’s heat for reading code, but for writing you quickly run into https://t.co/eAmgCQM2tZ. I think I know how to fix this.

[Dan Vanderkam 🦋 @danvdk]

@AndaristRake It's interesting that it seems to do two passes here. Is that unique to constructors?

[Dan Vanderkam 🦋 @danvdk]

Just published a big update to my "X-Ray Glasses for any types" VS Code extension: https://t.co/fPOq3Hm0YS

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!

[Ndeye Fatou Diop 🚢 💻 | DEV | 🇸🇳🇫🇷 @_ndeyefatoudiop]

Just started reading the 2nd edition of this book 🎉

I can’t recommend it enough! The first version made me an entire new dev.

[Dan Vanderkam 🦋 @danvdk]

@adokce Try any-xray 0.1.1, I lowered the VS Code requirement.

[Dan Vanderkam 🦋 @danvdk]

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! https://t.co/fPOq3Hm0YS

[Dan Vanderkam 🦋 @danvdk]

@IgorKrupenja Try installing 0.1.1, which lowers the VS Code requirement.

[Dan Vanderkam 🦋 @danvdk]

@IgorKrupenja Sure. I can’t imagine I’m using any remotely recent APIs, this was just the default.

[Dan Vanderkam 🦋 @danvdk]

@jjalan There are always unexpected any types that come from @types packages. For example, https://t.co/F5vHNIoKRf or https://t.co/7VcK4JS8fp

[Dan Vanderkam 🦋 @danvdk]

@deanylev Thanks, I’ll take a look. It’s almost certainly not finding the lib.d.ts files for your project, so it can’t get types for callbacks like forEach.

[Dan Vanderkam 🦋 @danvdk]

@_baxuz At the moment, high. But maybe this suggestion will lower it: https://t.co/LqcYlvXH3P

[Ashley Claymore @acutmore]

@danvdk @JoshuaKGoldberg I suspect you're already aware and this wouldn't work but just in case there is this:
https://t.co/jzw4D5ofqV
Command for getting type info from the existing tsserver.

[Dan Vanderkam 🦋 @danvdk]

@acutmore @JoshuaKGoldberg I was not, but I’ll give this a try! Thanks!🙏 This would also solve lots of issues around understanding everyone’s TS configuration.

[Dan Vanderkam 🦋 @danvdk]

@stevebeauge unknown is much safer than any, since you’ll get a type error if you try to do much of anything with it.

[Dan Vanderkam 🦋 @danvdk]

@mazrikbeats There’s no-unsafe-assignment and friends. My goal here was to make the anys visible, not necessarily errors. https://t.co/PHpmd9Jeh2

[Dan Vanderkam 🦋 @danvdk]

@ihorvorotnov @BenJ_Ayc0 @WebStormIDE noImplicitAny is a TS thing, not an IDE thing. It’s different than this. This will also help you find any types that come from library type definitions (like JSON.parse).

[Dan Vanderkam 🦋 @danvdk]

@deanylev Can you share your project? There’s a real diversity in how everyone has TS configured, I’m not surprised it’s failing on some setups.

[Dan Vanderkam 🦋 @danvdk]

@JoshuaKGoldberg Thanks! I just wish there were a way to do it without running my own copy of the language service…