# Javascript

What if libraries were active participants in their own observability and emit telemetry data themselves? Here's how Node's diagnostics API can make that a reality.

How Sentry's JS SDKs figure out your dynamic route names to make querying your issues easier.

Writing a rudimentary SQL parser and formatter in JavaScript that handles Sentry's need to format invalid SQL and output into JSX.

How we rebuilt Codecov's code renderer from the ground up to be faster and more efficient, utilizing virtualization.

Building a React component that automatically updates its font size to fill its parent element as fully as possible.

Preact or Svelte, which framework is best for building an embedded user feedback widget?

Let's dive into mutation testing. In this post we talk about how mutation testing works, the state of it in JavaScript and we share our results of applying it to our JavaScript SDK repository

How we resolved incorrect Codecov bundle size reporting when using GitHub Actions.

This post will outline learnings the Sentry SDK team had from releasing v8 of the JavaScript SDKs.

We're making updates to how Performance Scores are calculated in the Web Vitals module, which will bring them closer to what your users experience.

An in-depth analysis of how we managed to cut the Session Replay SDK bundle size by 35%.

The best way to figure out how overhead impacts you is to measure it yourself. Follow along as we show you how we went about measuring overhead on Sentry and how you can measure it on your own applications.

Sentry is a very fast-moving company. In just one month we merged 165 pull requests from 19 authors and changed over 800 files, with a total of over 22,000 additions and almost 10,000 deletions. By updating to Lerna 6...

Sentry helps every developer diagnose, fix, and optimize the performance of their code, and we need to deliver high quality stack traces in order to do so. In this blog post, we want to explain why source maps are ins...

In the modern web, the JavaScript you write is often down-compiled using a compiler like Babel to make sure your JavaScript is compatible with older browsers or environments. In addition, if you are using TypeScript (...

Developers started to notice just how big our JavaScript package was and yeah, we knew. We weren’t ignoring the issues; after all, we don’t want the Sentry package to be the cause of a slowdown. But to reduce our Java...

SDKs naturally increase in size over time. After all, it does take more bytes to implement more features. This is not a big deal for most languages—the relative size of each new feature is small, and load times and st...

Recently, Sentry converted 100% of its frontend React codebase from JavaScript to TypeScript. This year-long effort spanned over a dozen members of the engineering team, 1,100 files, and 95,000 lines of code. In this ...