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JavaScript

Introduction to continuous profiling

In this video, we will review the advantages of continuous profiling, the difference between continuous profiling vs. traditional profiling, and how continuous profiling can fit into your overall observability strategy. You’ll also learn more about Grafana Phlare, the new open source continuous profiling database, and get a look at the latest flame graph visualization in Grafana.
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JavaScript unit testing frameworks in 2022: A comparison

Choosing a JavaScript unit testing framework is an essential early step for any new front-end development project. Unit tests are great for peace of mind and reducing software errors. You should always make the time to test. But which framework should you choose for your project? We examined 11 of the most popular JavaScript unit testing frameworks according to stateofjs.com, to help you decide which is best for you.

Easy JavaScript error investigation with source maps

Hopefully by now you’re taken your first sip of Elastic RUM, or real user monitoring, and see the power of searching through traces and the User Experience metrics to gain insights into how users actually use and experience your application. One issue you may have experienced is the challenge of finding the source of errors for minified JavaScript files.

A guide to static analysis in JavaScript and TypeScript

The demands of a tight production schedule can make it difficult to produce consistent, readable, and concise code in the lead-up to a manual code review. This often makes the process stressful — if not outright dreaded. Standard tests are a critical part of development that verify that our code produces the expected outputs. But great tests don’t always lead to good code.

Understanding the Performance Impact of Generated JavaScript

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 (like the Sentry SDK’s do) or something similar, you’ll have to transpile your TypeScript to JavaScript.

JavaScript SDK "Package Size is Massive" - So we reduced it by 29%

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 JavaScript SDK package size effectively we had to account for shipping new capabilities, like being able to manage the health of a release and performance monitoring, while maintaining a manageable bundle size. After all, new features == bigger package - usually.

Minify CSS and JavaScript to accelerate website speed

Minification is the technique of terminating all undue extra characters from the source code. This method reduces file sizes, allowing for faster load times and less bandwidth load. Less code appearing in front-end web pages also leads to a more compact, faster-loading website. Most importantly, minification speeds up web pages for users on limited data plans, allowing them to enjoy your content with less worry about exceeding their download quota.

NestJS - Monitoring your NestJS Application using OpenTelemetry and SigNoz

Monitoring your NestJS application is critical for performance management. But setting up monitoring for NestJS applications can get cumbersome requiring multiple libraries and patterns. That's where OpenTelemetry comes in. In this tutorial, we will use SigNoz as a backend. SigNoz is an open-source APM tool that can be used for both metrics and distributed tracing. Let's get started and see how to use OpenTelemetry for a NestJS application.