Chrome Dev Summit 2019 – Big Web Quiz – Day 1

chrome dev summit
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This autumn, I first ever went to Chrome Dev Summit. It was a tremendously inspiring conference that intellectually put me far beyond my everyday tech routine. One of the fascinating experiences was Big Web Quiz. I like it both as an attendee as it was an entertaining way to catch up on what I missed in the Chrome development and from an event organizing perspective as it was a positive way to recap and further promote all the work that the Chrome team did in the previous year.Continue reading →

Idea night: Voluntary data sacrifice

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Accessibility is a hot topic in the last few years. Nearly any web-conference has at least one talk, that is dedicated to this theme.

These talks contain quite convincing arguments. One of the best persuasive and at the same explanatory rich visualization of the accessibility problem was done a while ago in the “Inclusive. A Microsoft Design Toolkit”Continue reading →

2 dimensions of the code review process complexity

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Photo by Pankaj Patel on Unsplash

You have probably been in my place. You have perfectly planned working day ahead, there are around 2-3 tasks that you need to do, and you think: “Wow, I finally have it under control,” and then you open your laptop, and realize, that at least three code review requests are waiting for your feedback. And even though you have recently working in some of the files, that PR is changing, CRs take much more time than you would expect.

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Visualizing sorting algorithms

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Currently, I am going through course JavaScript Algorithms and Data Structures (which I highly recommend by the way). For me, one of the strongest parts of this course was Colt ability to explain everything, not only how to implement code, but also what exactly one or other part is doing. Among all instruments used there, one of my favourites were ones, that visualize what is happening, when sorting algorithms are run.Continue reading →

Inexact vs exact flow object types: spreading

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If one wants to add flow annotation to object type and reuse some of the types, that was annotated in another object type, it can be done like:

type SharedProperties = {
length: number,
name: string,
type NewProperties = {
age: number,

However, in this case, not all will run smoothly here, as if to check age will accept, not only number type as valid but other as well.Continue reading →

Debugging tips – console.trace

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From my observation, debugging is the best-kept secret of the developer life. Everyone is doing quite often, some are doing it even every day, but rarely anyone is talking (not moaning :)) about it publicly. Have you seen excellent tech talk at the recent conference, that has addressed some debussing techniques or anything that can be used next time one should find a way to fix the bug? If yes, please, please, please, share it in the comments.Continue reading →

What I have learned from the Kent C. Dodds testing JavaScript course

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The strange thing is happening when one is gaining more experience – it is harder to identify or to find what new to learn. It definitely depends on the width of the area, as some things can be learned in a few hours, and for some, even a few years are not enough. And with this more broad areas it is easier to experience this phenomenon when even though you do know that you do not know everything, it is hard to identify what you do not know.Continue reading →

How to add flow type definition for raw-loader

Reading Time: 3 minutesRecently I have encountered a quite odd problem. I was trying to load *.html file as a string in my React component using raw-loader , but have obtained flow error that flow can’t recognize this type of import. And here fun starts 😉 As I haven’t found anything straightforward about flow typing raw-loader I took a look at how this problem was solved for a much more common use case – CSS Modules. There are quite a few googlable ways how to fix this error for CSS Modules, so let’s see what they are, and what are downfalls of each way:Continue reading →