Development
Rust for Frontend Developers
Why the systems programming language is taking over the JavaScript tooling ecosystem, and what you need to know.
By Sarah Jenkins · · 10 min read
Turbopack. SWC. Biome. Rolldown. The modern JavaScript build toolchain is being systematically rewritten in Rust. If you're a frontend developer in 2025, understanding Rust is no longer optional for understanding the tools you use every day. You don't need to write Rust to benefit — but knowing why it's winning helps you make better tooling decisions.
Why Rust for JavaScript Tooling?
JavaScript is single-threaded by design. Node.js tooling — webpack, Babel, Jest — is fundamentally constrained by this. Rust, by contrast, makes safe multi-threading its core guarantee. A Rust-based bundler can parallelize work across every CPU core without data races. The result is 10–100× faster builds for large codebases.
| Tool | Replaced By | Language | Speed Improvement |
|---|---|---|---|
| Babel | SWC | Rust | ~70× faster transpilation |
| webpack | Turbopack | Rust | ~10× faster HMR, 700× faster cold builds |
| ESLint | Biome | Rust | ~200× faster linting |
| Prettier | Biome | Rust | ~25× faster formatting |
| rollup | Rolldown | Rust | ~10× faster bundling (early numbers) |
Rust Fundamentals for JS Developers
You don't need to master Rust to understand your tools — but a few concepts are worth knowing:
ownership_basics.rs
// Rust's ownership system prevents data races at compile time
// This is why Rust tools can safely parallelize across threads
fn process_file(path: String) -> String {
// `path` is owned by this function
// No other thread can access it simultaneously
let content = std::fs::read_to_string(&path)
.expect("Failed to read file");
content.to_uppercase() // Return processed content
}
fn main() {
let files = vec!["a.ts", "b.ts", "c.ts"];
// Rayon makes parallelism trivial and safe
use rayon::prelude::*;
let results: Vec<String> = files
.into_par_iter()
.map(|f| process_file(f.to_string()))
.collect();
}