Add More Metadata to Your Front-end JavaScript Errors in AppSignal

Our front-end JavaScript library has been updated with an easier way to add more metadata to front-end errors using the sendError and wrap helpers. Previously, sendError and wrap helpers only supported customizing tags and the namespace for the error. More information could be set on error spans if they were manually created, but now that type of information can be added to errors sent using these helpers.


Instrumenting Our Frontend Test Suite (...and fixing what we found)

Here at Sentry, we like to dogfood our product as much as possible. Sometimes, it results in unusual applications of our product and sometimes these unusual applications pay off in a meaningful way. In this blog post, we’ll examine one such case where we use the Sentry JavaScript SDK to instrument Jest (which runs our frontend test suite) and how we addressed the issues that we found.


Clojure microservices for JavaScript developers part 3

This series was co-written by Tyler Sullberg and Musa Barighzaai. This is the third and final post in a series of posts for JavaScript developers about how to set up Clojure microservices. The previous posts were: Those previous posts are useful context, but you can clone the repo and jump into this post without reading them.


Clojure microservices for JavaScript developers part 2

This series was co-written by Musa Barighzaai and Tyler Sullberg. In the previous post, we explored high-level differences between thinking in Clojure compared to thinking in JavaScript. We are now ready to start building our first Clojure microservice. The microservice we are going to build will be very simple. It will be an HTTP server that uses a Redis data store to count how many times a given IP address has pinged the /counter endpoint.


Clojure microservices for JavaScript developers

This series was co-written by Tyler Sullberg and Musa Barighzaai. CircleCI is growing, which is wonderful. However, one of the growth challenges we have is that our backend is primarily written in Clojure, and few developers know Clojure. Many CircleCI engineers, including myself, have learned Clojure on the job. Before joining CircleCI, I was a JavaScript developer. As the lingua franca of software engineers, JavaScript is a relatively straightforward language to learn.


Javascript Pointers (They do exist!)

Javascript is often criticized for being a simple language, but if you take a closer look, there is actually a lot of nuance to it. For example, other languages often have pointers which are a way to store a reference to a specific place in memory. In C, Golang, and C# pointers are made using the ‘&’ operator. At first glance, there seems to be a conspicuous absence of this functionality for javascript.


Klocwork 2021.2 Launches JavaScript Analysis Engine

The latest release of Klocwork features the launch of JavaScript, which greatly enhances the static analysis and SAST tool’s offerings. In addition, the release includes a number of other significant improvements that greatly enhance the tool’s performance and functionality. Here, we provide an overview of the new analysis engine.


Optimized: Using A JavaScript (JS) Profiler For Improved Performance

No matter what you’re coding, there’s always room to optimize your code and improve performance. This can be a painstaking process, and if you’re going over your code line by line you’d better cancel all your plans and forget about getting any sleep! Fortunately, there are better ways to examine and optimize your code. A JS profiler is an efficient tool to help you understand your code better – effectively finding, pinpointing and optimizing bottlenecks in your code.


Why Debugging JavaScript Sucks - And What You Can Do About It

What makes JavaScript great is also what makes it frustrating to debug. Its asynchronous nature makes it easy to manipulate the DOM in response to user events, but it also makes it difficult to locate problems. And JavaScript’s ubiquity has resulted in a variety of runtimes (e.g. Chromium’s V8, Safari’s JavaScriptCore, and Firefox’s SpiderMonkey) but having so many platforms can cause dizzying idiosyncracies — all of which need to be supported equally.