Mateusz Burzyński
@AndaristRake
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programmer but also a little bit of code-poet wannabe, maintaining XState, Emotion, redux-saga & more, OSS enthusiast
Wroclaw, Poland
Joined June 2014
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I've spotted a new label in the TypeScript repo and I dig it 🤣
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Oh, yeeeeah, this has been merged 😍😍😍😍😍😍😍😍😍
TS 5.5 is gonna be one of the most epic releases in a while, once again - huge props to
@danvdk
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A code snippet like this saved me already *multiple times* when investigating why the focus shifts somewhere unexpectadly
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You all will love this, such a great DX improvement ❤️
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Just noticed my name in the TS 5.0 release notes, not bad for a junior dev
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Wow, this is huuuuuge:
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OMG, you only tell me now about this?!
{
"jest": {
"snapshotFormat": {
"printBasicPrototype": false
}
}
}
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This is not a drill!
Improvements to the *in operator* might be coming in TS 4.9 🔥🔥🔥
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One dev "super power" that I have is debugging... how do I teach this to others?
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Reverse mapped types are just so super elegant for certain use cases...
Here we have an equivalent of `Promise.allSettled` that retains positional information for each item in the input
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TIL: the second variant is more verbose but should be preferred because it's homomorphic (preserves property modifiers):
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Just published a new experimental
@babeljs
plugin which makes it easier to write render props (no nesting!) based on
@trueadm
idea , cc
@threepointone
@IAmTrySound
@reactjs
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A new set of immutable Array methods (change array by copy) just reached Stage 4. So they are coming to the language!
[].toReversed, [].toSorted, [].toSpliced, [].with
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This might be the weirdest fix I've added to a codebase after hours of debugging...
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TypeScript 5.0 Beta is going to be published today! Can't wait for playing more with it
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const modifiers for type parameters are coming to TS 5.0, I had a feeling that this might happen soon
loving, loving it ❤️
declare function bar<const T>(obj: T): T;
bar([1, 'foo']) // readonly [1, 'foo'], and not (string | number)[]
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aaaand `const` modifiers on type parameters landed in TS 🚀
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TypeScript team is already experimenting with allowing partial inference at all times (!)
let it land 🙏
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Still need to read through the whole thing but this looks quite exciting for dealing with a class of stale closure problems
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Who said that OSS work doesn't pay bills? Jokes on you!
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Tree-shaking deoptimizations demystified 🧙♂️ and some tips on how to make your libs more treeshakeable, by my humble self 😉
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redux saga v1 is finally out! just slight evolution, fixing past mistakes etc, certainly not the revolution. I hope your migration will go smoothly 🚀
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Hey mom, im in the TS release notes again!
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Yet another reason to avoid `instanceof` as much as possible.
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Just opened a new PR to TypeScript - one that would allow people to opt into "partial inference".
The current problem is that once you supply any type argument - the rest can't be inferred (defaults are used). I'm trying to change that.
Feedback welcome
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to overload functions or to not overload them in TS?
overloading is often easier but you might lose some control, especially when it comes to completions
you can often do better with "dynamic rest" technique
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auto-imports for `package.json
#imports
` just landed in TypeScript, I'm pretty stoked about this (but we have to wait till TS 5.4 before using it)!
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It looks like NoInfer<T> might come to TS 5.4 for real!
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My 100th commit has just been merged to
@typescript
It’s a wild run, learned a shitload in the process and yet I still barely scratched the surface.
For more to come 🍻!
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@erikras
given your description, I was literally expecting him to fall into the water - I'm confused now...
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Instantiation expressions are coming to TypeScript. It will, sort of, become possible to have the deferred application of type arguments. Wonky experiment to experiment with the syntax below and link to the TS PR too:
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Partial inference through _ sigil at call site got scheduled for TS 5.2 🎉
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Over 10% of the currently open PRs to TypeScript are mine... I should get a Hoarder achievement badge from GitHub or something
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Not exactly the hottest feature but if you ever wanted to narrow types in TS using `switch (true)` then TS 5.3 will finally support this :)
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Nobody can say that my code reviews are not thorough 😅
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@alistaiir
Dont put types condition first when u are using type:module at the top of ur package.json. It’s a mistake and TS wont resolve it it correctly from CJS-targeting files (authored in ESM) when using moduleResolution:node16
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Reverse mapped types are extremely powerful in TypeScript - but very little known.
Example: inferring per tuple element types based on one of the element’s properties:
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👩🎤 Emotion 11 is out! On 11/11 (at least in some parts of the world 😉). A year of tackling issues and helping the community - it wouldn't happen if not for the help of external contributors & the keen eye and the support of
@mitchellhamiltn
🚀
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`FunctionComp.defaultProps` gonna be deprecated in React 18.3.0
This is going to be a fun ride 🎢
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Isn't TypeScript just beautiful? 😜
Instantiations expressions are just awesome and probably way underutilized and little known! They require TS 4.7 though
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Understanding the foundations of the type system comes in pretty handy. Sometimes it helps write faster types 🏎
You can play around with those examples here:
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Please don't reimplement package resolution algorithms. Use libs - they exist for a reason and they are **battle tested**
Those few kbs that you can shave ain't worth the pain caused by the bugs you create by reimplementing this stuff
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Do you know how long it takes to land 100 commits to
@typescript
? 7 months 😅
I'm quite proud of myself for landing my 200th 😉
My 100th commit has just been merged to
@typescript
It’s a wild run, learned a shitload in the process and yet I still barely scratched the surface.
For more to come 🍻!
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1.toString() // syntax error
1..toString() // ok
1. toString() // syntax error
1 .toString() // ok
1/**/.toString() // ok
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Oh man, i cannot lie,
It still feels like a lucky roll of die:
Moving from one amazing team
To the job from my dream.
State machines, readable logic, open source?!
That life of mine have not turned out the worst 😉
Time to share our current state. We're excited to announce the Stately team that will be working on the mission of making application logic more visual, robust, and accessible.
Stay updated and get early access here:
👩💻🧑💻👇
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Stylis 4 has shipped - . Its a foundation of most css-in-js libs. A super tiny, fast and crazy as fuck css parser by
@thysultan
👏 ive helped with the newest release a little bit but this is all this man’s mind. Blessed for having a chance to work with him
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Just released beta of redux-saga v1. Try it out with: npm install --save-dev redux-saga
@beta
.
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nested `describe` blocks in tests are overrated... over time I often see tests added to random blocks because they are just appended~ to a file and nobody bothers finding the "proper" block. It's also hard to catch this during code review
just list them all flat...
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Based on my recent findings - the best way to gain followers is to:
1. Post what has been merges to TS
2. Post about a jest config option
3. Engage with Dan Abramov in some super random thread
I think im going to focus on those strategies now
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React team is thinking about introducing new APIs:
<Catch/>, createCatch() (for creating <TypedCatch/>) and raise()
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I've heard stories about M1 but executing a full TS test suite in under 2 minutes with fans barely being heard... this is ridiculous. My previous Mac took over 15 minutes to run through this and I could barely use it for other stuff in the meantime 😱 😱 😱
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After more than 3 years - my old PR to React was kinda merged, making different types of memo components reusing old props more consistently during bailouts.
Don't let your dreams die, just wait patiently 🤣
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I just had to pull over and recheck one extra thing in the TS playground that I had open cause I got a new idea while driving.
I’m sick. Send help
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Got my first PR to TypeScript that touches typechecking merged 🎉 single line fix 😅
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Just opened a new TypeScript feature request... this time for "named type parameters", this is what
@tannerlinsley
often refers to as generic bags
declare function fn<{ a extends number, b }>(arg1: a, arg2: b): void
fn<{ a: 100, b: 'foo' }>(100, 'foo')
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How to start debugging an infinite loop?
Just pause "at random" in devtools while looping and inspect the call stack. It might give you a lot of insight into what is happening.
You don't need a breakpoint to pause!
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More types of circular type references are being allowed by this PR 😍
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Just opened a new feature request for TypeScript - a new `preferinfer` type parameter modifier:
declare function get<T, preferinfer K extends keyof T>(obj: T, key: K): T[K]
get<User>({ name: 'Andarist', age: 32 }, 'name') // string
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the upcoming <Offscreen/> becomes <Activity/> in React:
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TIL that `typeof v === 'function'` and `isFunction(v)` behave differently in TS
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I poured (and continue pouring) so many hours of my thoughts into this...
Check it out while it's hot 🌡!
After many years & lots of feedback, we're finally announcing XState v5 beta 🚀
npm i xstate
@beta
• Powerful new statechart features ⚡️
• Actor logic for anything, not just state machines 🎭
• Reduced API surface area 🗜
• New docs 📚
• So many fixes & improvements ✨
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this is truly the darkest TypeScript magic I've seen
What if instead of hitting instantiation limits on cyclic types, your validator could pass them to optimized, type-safe generics?
Everything you've been told about the limitations of TypeScript is a lie- you just have to be willing to think a bit of outside the box0️⃣1️⃣📦
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Modern JS lib maintainer mantra: “please provide
@codesandbox
with the issue reproduced... please provide
@codesandbox
with the issue reproduced...”. Honestly cant imagine living without
@codesandbox
, the past without it feels grim nowadays
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TS 5.3 iteration plan:
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React landed its `experimental_useEvent` hook a few days ago. There are also tests there that show that the very same behavior can't be implemented in the user-land - those callbacks get updated ASAP, before any other effect types
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This is a valid JavaScript:
class N extends null {}
You can't construct an instance of this class but you can declare this class 😅
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Just refrained myself from posting a snarky response to a demanding OSS user.
Is there now anything I can’t do? 😮
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Current status: time-travel debugging
@typescript
's node run in a browser.
@replayio
is a hero tool I don't deserve. My dev life consists of 2 major eras now - I call them pre-Replay and post-Replay
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Sometimes it's helpful to name "branches" of your conditional types in TypeScript and use pattern like this.
I've seen this in some cool libs like . I've always wondered if TS can smartly only compute the "chosen" branch...
1/2
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@DavidKPiano
if you are not writing
mov al, [count]
inc al
mov [count], al
you are already doing it wrong
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A lot of stuff in here resonates with my own thoughts
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Did you know that this can be a dangerous operation?
const min = (arr: number[]) => Math.min(...arr)
If your `arr` is big enough - it will blow up your call stack 😉 It's also not totally a made-up problem, I've patched this issue yesterday in
@replayio
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@mattpocockuk
My bet: in the past TS didnt have intrinsic type aliases so the latter couldnt be implemented without such
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I opened a TypeScript PR with the PoC for extending reverse mapped types inference with the capability to infer *multiple* things per tuple element/object property through (what I call) concrete properties
Im pretty pumped about this potential feature 🤩
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What people will go through to squeeze two lines into one... amazing.
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Already experimenting with the upcoming `const` modifiers for TS type parameters.
Thanks to a tip from
@ahejlsberg
I have a working spike for *recursive* validation of initial/states/ids in XState:
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Congratz to everyone who got sponsorship from
@Microsoft
. I hope it becomes a norm. It’s a noce gesture - that’s for sure. “One time” sponsorships are worrying though, that doesn’t really give hopes for a sustainable future
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I can't express this enough but Preconstruct by
@mitchellhamiltn
( ) is fucking amazing for building libraries, especially for monorepos. It just amazes me how little spotlight it gets. Go and star it - or even better, use it and spread the love 🧡🎁
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TS 5.4 (stable) is available on npm already, grab it while it's hot 😉
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this gonna be a banger in the TS repo 🤣
those who know, know
🎉 New GitHub Feature
You can view the PRs that modifies the file you're currently viewing
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Escape rooms are cool and all, but have you ever tried to merge two long living branches?
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