This year, Chrome 144 shipped Temporal, the most significant evolution of JavaScript dates and times since the language's inception. But, the real breakthrough is what happened behind the scenes: for the first time, a major new Web API in Chromium wasn't built in C++, but in Rust.
This session provides a look at how we integrated temporal_rs into the heart of V8, marking a new chapter for the Rust ecosystem in the browser. We will discuss how we utilized Diplomat to create ergonomic C++ bindings that bridge Rust’s safety with V8’s internal architecture. We’ll also highlight how ICU4X provided high-performance, data-efficient calendrical calculations.
A key achievement of this journey was using a common library to power both the large, established C++ codebase of V8 and the pure-Rust Boa engine. We’ll show how this collaboration between Google, Igalia, the Unicode ICU4X team, the Boa contributors, and the University of Bergen achieved 99% test262 compliance.
Attendees will leave with a practical framework for building Rust-first components that elevate both new and existing platforms alike.
