Ladybird Browser adopts Rust

2 days ago

Ladybird is transitioning from C++ to Rust for memory safety and ecosystem maturity.
Rust was initially rejected due to poor fit with C++ OOP style but now chosen for its safety guarantees and ecosystem.
LibJS, the JavaScript engine, was the first component ported to Rust with 25,000 lines translated in two weeks.
The porting process used AI-assisted translation with human oversight, ensuring byte-for-byte identical output.
Extensive testing confirmed zero regressions in test suites and performance benchmarks.
New Rust code will coexist with C++ via well-defined interop boundaries, with porting managed by the core team.
The project will continue developing in C++ while gradually porting subsystems to Rust.

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