Miško Hevery (Builder.io/Qwik) @mhevery Twitter profile

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

`a = 0-x` is about 3-10x faster than `a = -x` 🤯 Let's jump into JavaScript VM details to see why and how to guard against this VM de-opt: 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

JSX could have been 2x faster if it was designed more optimally for JS VMs! Let's see what design decisions make JSX slow and how we could speed it up. 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

How can `a+b` be almost 4x faster than `b+a`? 🤯 1/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

useSignal() is the future of web frameworks and is a better abstraction than useState(), which is showing its age. 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Make your code faster with Bloom filters. They are like HashMaps but smaller and allow you to short-circuit more expensive operations. 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

useEffect is a bad abstraction There is a better way: 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Did you know that without 0x5F3759DF (magic number) Qake (the game) would not have been possible? The fast inverse square root is 🤯 code popularized by Quake, which at first sight looks like complete nonsense. Google: 0x5F3759DF 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Strongly prefer `===` over `==`! `==` is complex to reason about and can be up to 15x slower then `===` 1/5

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Understanding monomorphism can improve your JavaScript performance 60x. Curios to find out more, read this thread.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

React’s upcoming compiler will not solve prop-drilling, but Signals solve it well. 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Amdahl's law: the nightmare of a perf engineer! "The overall performance improvement gained by optimizing a single part of a system is limited by the fraction of time that the improved part is actually used"

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Miško Hevery (Builder.io/Qwik)

@mhevery

3 years

After 15 years at Google and 10 years on @angular I am excited to announce that I am moving onto the next chapter in my professional life. I will be joining @builderio as their CTO to help empower anyone to create blazing fast sites, with some very exciting updates coming soon.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Lazy loading in frameworks is a lie! (And then we blame the developer for slow sites.) 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

It's best to name your variables positively. Negative variables take longer to process in your brain because they can be part of negated expressions, creating double negatives.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Do you know why signals are all the rage now? Solid has them, preact, and now angular is working on them. This is why I think it's the future...

useSignal() is the Future of Web Frameworks

A signal is a way to store the state of your application, similar to useState() in React. But there are some key differences that give Signals the edge.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

After months of hard work and community feedback, we are excited to announce Qwik RC! V1 is just around the corner, so we would really value your feedback on this. Find out more on our blog:

Qwik Reaches RC Milestone

After months of hard work and community feedback, we are excited to announce Qwik Release Candidate and ready for production.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Hydration is a widely accepted solution to add interactivity to HTML, but we need to accept it for what it is: a clunky workaround. It is time to move past hydration for a faster web:

Hydration is Pure Overhead

Why hydration is a workaround, not the solution. Dive deeper into hydration. Understand how Resumability works.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

7 months

Lazy-loading is like exercise. Everyone says they are doing it, few are, and those that are rarely know what they are doing. Frameworks were not designed with lazy loading in mind. It was a late addition to their development life cycle. We now pay the price of bloated apps. /1

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Understanding: useState() vs useSignal() Signals scale better because they track subscriptions and render only the necessary components. Signals are surgical! State does not track who is listening and, therefore, must always re-execute all templates below it.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Everyone is excited about signals because of better DX and faster updates. I am excited about signals because of the lazy execution of code => Better startup performance on slow networks and slow devices. 🧵

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

You keep using that tag: <link rel="prefetch"> I don't think it does what you think it does.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

🎉Qwik is now in BETA! 🎉 After months of hard work by @adamdbradley and @manucorporat @builderio is excited to announce @QwikDev (and Qwik City) is in BETA and ready to power your instant apps!

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Blank page with an embedded tweet. How bad can it be? JS: 1.5MB 🤯 PageSpeed score: 61/100 🤯 Time to Interactive: 9 sec 🤯 TBT: 1.7 sec 🤯 What hope does an average site have if a simple tweet requires MegaBytes of JS and seconds to interactivity?

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

It took me a long time to understand the value of React. Here are a few things that React nailed, and it is worth learning from. - Components are functions - Simplicity of JSX - Composability of hooks. - Explicitly not solving some things. 1/5

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Want to know what all the fuss is about Signals vs. Observables? I wrote an article on this, but check this thread out for a quick TLDR. 1/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Colocating client/server code in a single file is the next battleground for better DX between meta frameworks. Let's zoom into what it is! 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

In engineering, rarely is A always better than B. Usually, A and B come with a long list of PROS and CONS. Your job as an engineer is to figure out which PROS matter and which CONS you can live with.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Deoptigate is an awesome tool that annotates your source code showing you where the slow property access is.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

The curse of engineering is that everything is obvious after the fact. The fact that it took you n weeks and a half dozen design docs to figure it out is instantly forgotten.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

History of Reactivity: My journey of how I got to signals. As always, we all stand on the shoulders of giants.

A Brief History of Reactivity

In this post, Miško tells the story of his personal journey and takes about the history of reactivity along different frameworks.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

One must be very careful when doing performance testing, or you end up convincing yourself of things that don't hold in real-world applications. 6/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

10 months

At Berlin central train station. It is an engineering marvel! Trains on multiple levels. My mind is blown.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Innovations of different frameworks from my perspective. @angular , React, @sveltjs , @solid_js , @QwikDev 🧵

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

this.age++;

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

We don't download the whole movie before starting to watch it. Why do we have to download the whole application before it becomes interactive? Imagine a world where the Application could be streamed to you in the same way as Movies.

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

The fact that this works in @QwikDev surprised even me! But this is what we mean by "unified execution model."

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

Software engineering is about tradeoffs. Let's talk about how data fetching happens in different meta-frameworks and what the trade-offs of those approaches are.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

What is a hashing function, and how does it relate to HashMaps?

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

My talk from #ng -conf on WebApps at Scale looks into how we got here and what kind of challenges lie ahead.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

@MaxRovensky You don’t need to care. But it is sometimes nice to know how things work under the hood.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Understanding how JavaScript Virtual Machines work can have up to a 60x performance impact. Learn all about monomorphism and how it impacts performance in my latest blog post:

Understanding Monomorphism to Improve Your JS Performance up to 60x

A deep dive into polymorphism in JavaScript. Understanding this concept can improve your JavaScript performance by 60x.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

I have built a lot of frameworks that no one has ever heard of before one became popular. - JS framework - Pagelet: DI for MPAs - ActionScript Flex Personal - ActionScript Flex Work - AngularJS <= This one became popular Keep trying until you succeed!

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Resumabilty is the start of a new generation of frameworks.

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Miško Hevery (Builder.io/Qwik)

@mhevery

5 years

Watch () my presentation () on JavaScript VM performance optimizations at #AngularConnect and learnings for @angular Ivy. Play with the tools here ().

GitHub - mhevery/AngularConnect-2019: AngularConnect-2019

AngularConnect-2019. Contribute to mhevery/AngularConnect-2019 development by creating an account on GitHub.

github.com

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Miško Hevery (Builder.io/Qwik)

@mhevery

3 years

Excited to share what we’ve been working on to majorly speed up the web. We think Qwik will be a game-changer - you can read more about it

A first look at Qwik - the HTML first framework

At Builder.io, we empower non-developers to build and edit blazing fast sites with a powerful visual...

dev.to

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

There are two kinds of developers in this world. Those that suffer from imposter syndrome and those that lack self-reflection.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Hydration is a horrible workaround because web frameworks don't embrace how browsers actually work. Yet somehow we have turned it into a virtue. Hydration is a hack to recover the app&fw state by eagerly executing the app code in the browser. That is why your app is slow.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Why are all the meta-framework people suddenly talking about code extraction? It is a new way to make your code more seamless and type-safe across the client and server. I wrote about this and more of the exciting possibilities in my latest article:

WTF Is Code Extraction

Code extraction allows you to collocate client and server code in the same file. Let's take this idea to 11.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Understand resumability from the ground up by building your own resumable framework. 1/10

Build your own resumability

Learn how Resumability works by following these steps to create the functionality in your own Javascript app.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

What can Remix, Fresh, Astro, NextJS, and @QwikDev teach us about the performance of websites? Let's dive into data and its implications => Performance is about not executing JavaScript!

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

🌶️ take Both Angular and React are dirty checking frameworks! (Not reactive) Angular dirty checks your data. React dirty checks your vDOM. PS: a good argument can be made that dirty checking data is cheaper then vDOM.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Stylesheets were developed for styling documents and as such are ill suited for styling applications. Here is why, and what you can do about it:

A Better Way to Use CSS in Web Applications

Discussing the properties that make CSS hard to work with, analyzing solutions, and proposing a solution that meets all goals are the topics of this article.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

11 months

My Take on a Unified Theory of Reactivity via @builderio

My Take on a Unified Theory of Reactivity

Misko shares a view on reactivity in Javascript web apps. Uncover how reactivity works today and what its path forward might be.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Get faster startup performance by running effects as part of SSR/SSG instead of client side. 🧵🪡🧶

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

After months of hard work by @manucorporat , @adamdbradley , and the awesome Qwik community, we are finally here! I can't express just how much joy this gives me. It is a start of a new era for web application development.

Qwik

@QwikDev

1 year

It’s finally here… announcing Qwik v1.0! Build instantly-interactive web apps without effort Now generally available 🥳

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Miško Hevery (Builder.io/Qwik)

@mhevery

8 months

Slow apps can be made performant by: - Lazy loading (load less) - Lazy execution (do less) - Memoization (don't redo work) Most teams go through cycles of feature-dev and then optimization. But as soon as the optimization sprint is over, the app slowly regresses in performance…

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Want to know how reactivity compares across frameworks? Well, this article is for you:

Unveiling the Magic: Exploring Reactivity Across Various Frameworks

Ever wondered how reactivity works in your favorite framework? We'll take a look at the key concepts and compare how frameworks accomplish reactivity.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

How do functions break up? They stop calling each other. 🥁

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Software engineering is constantly banging your head against what looks like unsolvable problems with suboptimal solutions. Talk to people around you, sleep on the problems, and eventually, a beautiful and simple solution arises. Persistence is the name of the game.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

My need to build frameworks is completely irrational. I see a better way of doing it and I just have to do it! I told myself no more frameworks after Angular and here I am building Qwik.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

As developers, we know how to serialize: - Data => JSON - Code => file.js But how do you serialize closure (Code + Data)? Qwik's key innovation, which enables all other magic, is that it knows how to serialize closures on servers and invoke them on clients, key to Resumability!

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

Want to know how @QwikDev delivers instant-on applications no matter the application complexity? It's simple. Don't overwhelm the browser with 100s of KBs of JavaScript all at once, no matter how large your app gets. It's how Qwik works.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

People think that apps are hard to build because JavaScript sucks, so they keep inventing new languages that transpile to JavaScript. The real reason is that we are missing proper abstractions, and that is why frameworks exist.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Awesome solutions are rarely created by committees or large organizations. It is almost always a single person with passion and vision that slowly infects others.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

I strangely agree with this guy…

Frontend Masters 💻✨

@FrontendMasters

1 year

Qwik framework's philosophy of "owning the entire problem of building a web app" @mhevery His new course on Qwik:

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Checkout some of these awesome frameworks that have signals natively: @QwikDev , @solid_js , @vuejs (they call it shallowRef()), @preactjs .

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Learnings: - Avoid using the negate operator `-x`! - Prefer the subtraction operation `0-x` to get a negative number!

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Miško Hevery (Builder.io/Qwik)

@mhevery

9 years

Would you like to help with the development of #Angular2 ? We have carved out some starter issues:

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Everything you always wanted to know about why Resumability creates instant-on web applications and hydration does not but were afraid to ask: 1/6

Understanding Resumability from the Ground Up

Resumability promises a constant boot time for your application, whereas the current hydration approach has no upper limit on the time it can take.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Mad props to @youyuxi and @RyanCarniato for making benchmarks on @QwikDev and then privately reaching out to us to let us fix issues. That is how OSS is supposed to work! Thank you, and I want to see more of this!

Manu (Qwik)

@manucorporat

2 years

@youyuxi @QwikDev the test involves resuming/hydrating a page with more than 200.000 nodes

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Miško Hevery (Builder.io/Qwik)

@mhevery

4 months

Long time ago few of us wrote "Guide to testable code" It used to be hosted on my site, which is no longer up, but I have saved this content here:

GitHub - mhevery/guide-to-testable-code

Contribute to mhevery/guide-to-testable-code development by creating an account on GitHub.

github.com

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

I constantly hear the misconception that @QwikDev / Resumability is slow on the first interaction. Let me show you real-world data and a demo showing you how instant it is.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

But wait! Running the same tests in opposite order results in the opposite result? Now, `b+a` is 3.6x faster than `a+B`? 🤯 Both can't be true! Welcome to JavaScript VM de-opt! 3/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Check out the video on @QwikDev deep dive, which @FrontendMasters just published for free. A wealth of knowledge there. 1/14

Qwik Framework Deep-Dive Full Course with Misko Hevery (The Creator...

This is a deep dive on Qwik as a follow up to our intro to Qwik course found here: https://frontendmasters.com/courses/qwik/?utm_source=youtube&utm_medium=yo...

www.youtube.com

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

The problem with today's frameworks is not that it takes too long to render your shopping cart but that it takes too long before you can click it. So why are we obsessed with rendering performance instead of startup performance?

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Your next JavaScript framework will be reactive! But reactivity is not enough, it needs to be resumable as well so we are progressing UX not just DX.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Bloom filters are one of my favorite data structures. But they are also useful for speeding up your code.

Bloom Filters Can Speed Up Your Code

Bloom filters to speed up your code. They are faster than a HashMap, memory-wise more efficient than a HashMap, and still provide exciting value.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

8 years

Angular 2 Router slides from #ngconf #ngConf2016

ng-conf 2016: Router

Angular 2: Router May 4, 2016 +Miško Hevery @mhevery

docs.google.com

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

I see a lot of comparisons of @astrodotbuild vs. @QwikDev on the web. Some of the characterizations, I disagree with it, so I wanted to share my point of view. 🧵

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

As the complexity of applications increases, the amount of JavaScript downloaded increases. The only way we can continue building more complex web applications in the future is to lazy load on interaction, not on initial load. Read more here:

Our Current Frameworks are O(n); We Need O(1)

As the complexity of applications increases, the amount of JavaScript downloaded increases. The future is to lazy load on interaction, not on initial load.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

7 months

Hydration? Why all the fuss? Let's dive deep into hydration and why it makes lazy-loading harder than it should be.

Hydration, the Saboteur of Lazy Loading

Discover how some of the key functions of Hydration hurt performance, and how developers handle them. Learn about how Qwik offers an alternative to hydration.

www.builder.io

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Love the innovation that @RyanCarniato has placed in @solid_js . The reactivity composition is amazing. I think all future frames will be fine grained reactive.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

ToDo app interactive under <50 ms on @Cloudflare edge pages. @QwikDev pages have this performance independent of app complexity. Check it out: (Thank you @petebd @GregBrimble @manucorporat for making this a reality.)

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Let's assume: `x` is an Integer and `x = 0` `0-x` => `0-0 => 0`, Result is `0` (Integer) Perfect! `-x` => negate `x`. - For any non-zero value, the result is an Integer. - But for `0`, the result is `-0`. But integers can't have `-0`, So JavaScript stores it as a Float `-0`.

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

Not all lazy loading is created equal because most systems only have one entry point. @QwikDev is different because each bundle is an entry point. This significantly reduces the amount of JS it needs to download or execute.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

The rules for knowing under which conditions the VM coerces the values are complex and esoteric. 2/5

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

I have never seen a language that transpiles to JavaScript succeed. (And I predict I never will) The semantic mismatch is never worth any marginal improvements! TypeScript is JavaScript with no semantic mismatch, and that is why it is winning!

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Here is a test to prove it!!! 2/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

6 months

Are you wondering how @QwikDev can resume applications without eagerly downloading JavaScript?

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

I said this before: You either have imposter syndrome or lack self reflection.

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

The JIT incorrectly assumed it was safe to inline `fnA` into the test harness, because the test harness always received the same `fnA` function. (monomorphic call site.) Inlined functions run faster. 4/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

But when `fnB` started running, the JIT realized its mistake (de-opt). Inlining was removed because the call is now sometimes `fnA` and sometimes `fnB` (polymorphic). So the second perf test ran without inlining (slower). The second test appears slower! 5/6

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

I am so excited about signals in Angular, and also so proud of the Angular team for doing this!

Sarah Drasner

@sarah_edo

1 year

What if I told you Angular is about to have a renaissance? 🎆 Angular just released a new Signals reactivity primitive and it's just the first step! I made a little explainer about what it is:

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

The first thing to understand is that JavaScript has two representations for numbers: - Integers: Fast path - Floats (IEEE 754): Slower path Integers are stored as “Two's complement” and can't have `-0`, but Floats can!

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

useState() returns the value "in time" rather than the state "over time" it represents. This can lead to problems when value is captured in closures such as useEffect().

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Miško Hevery (Builder.io/Qwik)

@mhevery

1 year

Today the code has little use because modern CPUs can efficiently perform such operations. But it makes for a good archeological dig kind of a read.

Fast inverse square root - Wikipedia

en.wikipedia.org

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

.⁦ @angular ⁩ reunion.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

Interested in becoming a @QwikDev contributor? Check out this in depth introduction by @manucorporat

Qwik Core Developers Training

Introduction to how to contribute to Qwik project. This is a low-level exploration of how to contribute to Qwik, build commands, code organization, and inter...

www.youtube.com

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Miško Hevery (Builder.io/Qwik)

@mhevery

7 months

So proud of my oldest kid. Halloween is coming and he manufactured his own costume. Setting a goal and executing is one of the hardest things in life.

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Miško Hevery (Builder.io/Qwik)

@mhevery

2 years

♥️ the explanation of how @QwikDev is different! A must read!

React and Next.js is DEAD — Something New is (Finally) Replacing It (For Good)

Is this the beginning of the next revolution for JavaScript Framework? Apparently, YES!

javascript.plainenglish.io

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