Hans-Halverson/brimstone

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1317 stars · 32 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Brimstone is a JavaScript engine written from scratch in Rust, implementing nearly the full ECMAScript specification (ES2026) including a bytecode VM, compacting garbage collector, custom parser, and RegExp engine. It is a work in progress with >97% test262 conformance and is not yet production-ready.

Use cases

• run javascript files from the command line
• embed a javascript engine in a rust application
• study how a javascript engine is implemented
• test ecmascript conformance against test262
• experiment with bytecode vm and garbage collector design in rust

When to choose

• you need a self-contained, minimal-dependency JS engine in Rust
• you want to hack on or learn from a from-scratch ECMAScript implementation
• you need recent ES2026 features like Temporal in a Rust-native engine

When to avoid

• you need a production-grade, battle-tested JavaScript runtime
• your code relies on SharedArrayBuffer or Atomics
• you need Node.js APIs or an npm ecosystem runtime

Facets

library · maturity experimental

interpreter compiler programming-language parser testing fuzzing programming-languages compilers parsers developer-tools performance rust cross-platform cli javascript-engine ecmascript bytecode-vm garbage-collector test262 v8-inspired

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