A transcript of a spring 2026 lightning talk, as presented at Boulder Ruby. Bio: Joel is a staff software engineer at GitHub, working on the health of the GitHub.com Rails monolith. Abstract: We’ve spent the past few months integrating Herb into the GitHub.com monolith. It caught numerous bugs missed by our existing tooling and allowed us to migrate off the effectively-archived erb_lint, but a key performance blocker remains. In this talk, I’ll share how you can see similar benefits in your codebase today and help improve the project ahead of its 1.0 release. Before I get started, how many people here have heard of Herb? For those who haven’t, Herb is An ecosystem of powerful and seamless developer tools for HTML+ERB (HTML + Embedded Ruby) templates., created by Marco Roth. The crown jewel of the Herb ecosystem is the Herb parser, which is written in C. Based on Prism, its syntax tree is the basis for all the modern developer experience features you’d expect but were otherwise missing…
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