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Artem Zakharchenko

@kettanaito.com

4K followers 200 following 3.6K posts

Software engineer. Helping you master automated testing at http://EpicWeb.dev. Author mswjs.io. Instructor egghead.io. I tell stories @zakarcher.com. My debut book "LOGGERHEADS" it out 👇 https://zakarcher.com/books/loggerheads

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Artem Zakharchenko @kettanaito.com · May 12

Huge news! I've written a book.

This is a story of light and dark that won't leave you indifferent. Illustrated, atmospheric, and meaningful. The kind that stays with you.

Please enjoy this cover reveal for Loggerheads:
zakarcher.com/blog/cover-...

📚💙

Cover reveal: Loggerheads

Artem Zakharchenko @kettanaito.com · 9h

Thank you! 🙏

Artem Zakharchenko @kettanaito.com · 17h

From my experience, whenever I had tests failing in headless was because running in headful mode is generally slower, and that slowness was offsetting the race conditions my tests (incorrectly) had.

Artem Zakharchenko @kettanaito.com · 17h

Do you remember an example of such a test?
The cause is usually in the test itself, is it not?

Artem Zakharchenko @kettanaito.com · 1d

They are not the same though. You do not reach to bind/apply/call if you just want a function call. You usually reach to them because you want to invoke the function with a different context. Or create a bound function. I can't say they compare at all since they do different things.

Artem Zakharchenko @kettanaito.com · 1d

No one uses it in enterprise code and for the better. Quite a few usages in open source though. There are also times when you *have to* use it. Things like:

callback(obj.method)

Better not forget to rebind method to object or here come bugs.

Artem Zakharchenko @kettanaito.com · 1d

target esnext, module esnext, nothing else that I can tell.

Artem Zakharchenko @kettanaito.com · 1d

But if you are talking about runtime values, well, that can be said about the entirety of TypeScript anyhow.

Artem Zakharchenko @kettanaito.com · 1d

TypeScript begs to differ.

Artem Zakharchenko @kettanaito.com · 1d

Vitest is awesome.

Artem Zakharchenko @kettanaito.com · 1d

Both. Awesome reply! Thanks!

Artem Zakharchenko @kettanaito.com · 2d

Only if you be there to meet you, François!

Artem Zakharchenko @kettanaito.com · 2d

Inspiring but not helpful 😅 Trying to see what kind of struggles I'm missing to address.

Artem Zakharchenko @kettanaito.com · 2d

Wow so few of you actually knew you can type "this" in TypeScript and it's NOT an argument. I need to talk more about API design.

Artem Zakharchenko @kettanaito.com · 2d

If they have me! Thanks for the recommendation, Dominik!

Artem Zakharchenko @kettanaito.com · 2d

What were the top 3 things that confused you when you started writing automated tests?

Artem Zakharchenko @kettanaito.com · 2d

If I crack the new MSW architecture, I'd like to give a 30m talk about it.

Which conference should I talk about this at?

Artem Zakharchenko @kettanaito.com · 2d

All the existing APIs have been rewritten to the new architecture in MSW. All the tests are passing. We're truly onto something!

Now, let's see how it fares against this new crazy thing...

Artem Zakharchenko @kettanaito.com · 2d

From where I stand, an optimal DX seems like a mixture of classes and functions. It doesn't have to leak to the consumer, as you can wrap classes in instantiating functions (like we're doing already with `setupWorker`, for example). Cannot say it's perfect but well.

Artem Zakharchenko @kettanaito.com · 2d

Functions do suck at behavior composition. I'm not talking about functional composition here. z(y(x()) is great, apart from the thing that very few people in webdev even understand what I just wrote. I'm talking primarily about fn returning an object which methods extend base().

Artem Zakharchenko @kettanaito.com · 2d

Functions, on the other hand, don't suffer from the inference issues and you can expose a `defineXYZ` pattern that will infer, say, the argument/return types of the methods from the returned object gracefully. I love that.

Artem Zakharchenko @kettanaito.com · 2d

Where classes fall short is in TypeScript. I bugs me that there's no method argument type inference at all. You have to re-type your methods even if you don't deviate from the base class. Extremely annoying and yields terrible DX as a public API.

Artem Zakharchenko @kettanaito.com · 2d

Classes are really great for, surprise-surprise, inheritance! Tapping into `super` is a powerful way to compose functionality. Classes are also unmatched for "here's a boilerplate for a behavior" (aka plugin systems).

Artem Zakharchenko @kettanaito.com · 2d

There are things that classes do better. There are things that functions do better. But mixing both within the same API feels clanky. Conflicted about this.

Artem Zakharchenko @kettanaito.com · 3d

iirc, I have trusted publishing set up but I still need a token to actually publish. Aren't those layers to the process, not exclusives?

Artem Zakharchenko @kettanaito.com · 3d

Does that not defeat the purpose of expiring tokens being safe?