Armin Ronacher

Principal Architect


Armin Ronacher is the Principal Architect at Sentry. He's the creator of the Flask web framework, very emotional about APIs and system architecture.


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 insufficient for solving this problem, the challenges we faced, and how we eventually pulled it off by parsing JavaScript.
Other than Python, JavaScript is the oldest platform that Sentry properly supports, which makes sense considering many Python services (including Sentry itself) have a JavaScript front-end. The system that almost everybody uses to debug transpiled code (and the hopefully apparent subject of this blog post) is source maps. Today, we want to focus on some of the their shortcomings and why source maps cause problems for platforms like Sentry.