# trynova/nova

JS engine lolz

Repository: https://github.com/trynova/nova
Canonical: https://ross.abutalabs.com/products/trynova-nova
Homepage: https://trynova.dev/
Language: Rust
License: MPL-2.0
License Family: copyleft
Topics: data-oriented-design, javascript, javascript-engine
Last push: 2026-06-14T08:47:53+00:00

## Health v2 (maintenance only)
Score: 63/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 87, release rhythm 12, longevity 100
- inputs: {"age_days": 1470, "days_push": 80, "days_rel": 379, "gap_med": null, "n_releases_24m": 1}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1942, forks 79 (observed 2026-08-28T04:05:57.533248+00:00)

## What it is
Nova is a JavaScript (ECMAScript) engine written in Rust, focused on being lightweight, modular, and easy to embed, with a data-oriented design that follows the ECMAScript specification's structure. It is exposed as a Rust library so host applications can serve as JavaScript runtimes, and it currently passes roughly 80% of the Test262 suite.

## Use cases
- embed a JavaScript engine in a Rust application
- run one-off JavaScript scripts from Rust
- build a custom JavaScript runtime
- experiment with data-oriented language engine design
- evaluate alternative JS engines to V8 or Boa
- run strictly-typed TypeScript-compiled JavaScript with a small memory footprint

## When to choose
- you need an embeddable JS engine with a small memory footprint
- your project is in Rust and you want idiomatic Rust APIs for hosting JS
- you want a modular engine whose architecture mirrors the ECMAScript spec
- you're researching or learning how JS engines are built

## When to avoid
- you need top-tier interpreter or JIT performance today
- you need full ECMAScript compliance (Test262 pass rate is ~80%)
- you need WebAssembly support (planned but not yet available)
- you need production-grade LTS guarantees

## Facets
- artifact type: library
- maturity: active
- function: interpreter, parser, compiler
- domain: programming-languages, developer-tools, web-development
- platform: rust, cross-platform
- tags: javascript-engine, ecmascript, data-oriented-design, embeddable, wasm-future

## Member repositories
- trynova/nova (main) score 63

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:57.533248+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:08:05.116948+00:00, confidence not recorded.
  - readme: https://github.com/trynova/nova (fetched 2026-08-28T04:05:57.533248+00:00, sha 9a6a4e921e71)
  - homepage: https://trynova.dev/ (fetched 2026-08-29T10:47:11.989091+00:00, sha bc64bb18419e)
- Data as of 2026-08-30T08:39:29.467469+00:00.