For JavaScript there's been a sharp increase in the amount of tooling that is written (or rewritten) in Rust: Turbopack, SWC, Vite's upcoming rewrite of roll-up. It doesn't seem like it is competing with JavaScript for writing web applications, but the tooling is definitely seeing more adoption of Rust.
In general Rust is great for writing developer tooling. You need low latency, high throughput, low memory footprint while being stable enough that it doesn’t crash much. Projects like Turbopack, Ruff (Python linter), Biome have all had some success and may continue to.
