author: Krasimir Tsonev

Hi there, I'm Krasimir. Senior front-end engineer with over 13 years of experience. I write, speak and occasionally code stuff.

Octomments - using GitHub as a comment plugin

posted in JavaScript on 2020-01-31

87% of my readers are using Chrome on desktop. This means that I have the luxury to care less about performance. However I just recently found that this blog has 56 (out of 100) points on Google's pagespeed test. That's not good. The report says that my Disqus comments are blocking the main thread for ~900ms. I want comments on my blog but I also want my users to reach to content as quickly as possible. So, after so many years using Disqus I decided to break with it and use something else.

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"Exit strategy" by Travis Bible

posted in Cinema on 2020-01-24

Two brothers caught in a time loop must traverse a series of maze-like events in order to prevent a catastrophic fire from occurring.

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VSCode go to definition/implementation fixed

posted in JavaScript on 2020-01-17

I just spent ~2 hours on this and I had to blog about it. I bet I will come back to the same problem and it will be nice to have a quick solution at hand. And the problem that I'm talking about is the non working Go to definition or Go to implementation feature of VSCode. Or in other words the JavaScript IntelliSense was not working for me. Of course it was annoying because I had to navigate to files manually via the folder tree on the left or typing the name of the file in the Cmd+Shift+P popup.

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Running Prettier for specific Git branch

posted in Architecture on 2020-01-14

I'm working on a project in my own git branch. At the end of my working day I want to do one thing - run Prettier so my code is nicely formatted before I submit the PR for code review. Of course I know about the VSCode Prettier extension but right now my editor is kinda broken and I don't want to mess with it. I'm still on my branch and I run Prettier from the terminal. All good but the amount of changes that happened is so big that my 50+ loc updates are like a needle in a haystack. It is like that because apparently there are already malformatted files in the project. It is definitely not possible to understand what I did because of so much noise. So ... I want to run Prettier but only on the files that I touched in that particular branch.

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AST fun. Remove a function call from your bundle

posted in JavaScript on 2020-01-13

I'm working on a small library that has a logger. I'm bundling the app to a single file and I want to disable the logger for the production version. In this blog post we will see how I removed the logger.log calls from my bundle using AST (abstract syntax tree).

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"The Candidate" by David Karlak

posted in Cinema on 2020-01-12

The story follows a secret society whose purpose is to find people who don’t deserve to live and to kill them with their thoughts. The tension between the pessimistic protagonist and the liaison of the secret society comes to a head in a riveting twist.

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Hopa - zero config CLI that runs JavaScript and TypeScript

posted in JavaScript on 2020-01-12

Yesterday was one of those days. I stumbled a task and wanted to find the right tool for it. That same task is on my way at least twice a week and I always refuse to optimize it. Because it was a weekend I decided to spend some time and research a proper tool for the job. Well, I find nothing that suites my need. I time-boxed a hour and said F.ck it!. I will code it myself. That's how Hopa was born - a zero config CLI that runs JavaScript and TypeScript. Transpiles, bundles, watches and executes code.

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Part 3: Riew - reactive view in patterns

posted in Riew on 2020-01-06

In this article we will see some use cases of Riew. Those are patterns which I found repeating while using the library. There are other blog posts part of the same series and I will suggest checking at least this one so you get a basic understanding before jumping into the code snippets below.

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Part 2: Riew - reactive view basics

posted in Riew on 2020-01-06

Riew is a library based on communicating sequential processes (CSP). It is made to help with communication and synchronization between your view and business logic. It's distributed as a npm package, it has 0 dependencies and adds ~8KBs (gzip) to your application on production.

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Part 1: We need channels! A gentle introduction to communicating sequential processes.

posted in Riew on 2020-01-06

CSP is a formal language for describing patterns of interaction in concurrent systems. It's used in Go, Crystal, Clojure's core.async and a couple of other places. The idea in its core is nothing so complicated but it offers some interesting capabilities. Surprisingly enough it is not really popular in JavaScript. Recently I'm exploring this pattern and here are my findings.

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