OPEN SOURCE / RUST + V8 / v1.16.0

Amberjs

A JavaScript and TypeScript runtime in Rust and V8.

One binary: amber. Run scripts, Jest-style tests, MCP tools, and amber:ai tensors — with an opt-in capability sandbox. Not a Node.js clone. Node Conformance 5.0 is 55/55.

Visit AmberjsView on GitHub
Engine
V8
Host
Rust
Version
1.16.0
License
MIT
amber run hello.ts
hello.tsTypeScript
1const runtime = "Amber"23console.log(`hello from ${runtime}`)
Execution trace
01Readhello.ts
02Type-stripoxc → JS
03ExecuteV8 isolate
›hello from Amberexit 0
PUBLIC MATURITY

Not a Node.js clone. Coverage is per-API.

Amber labels every command Stable, Preview, or Experimental. Node Conformance 5.0 reports 55/55 fixtures; that is a fixture score, not a drop-in Node promise. Preview and Experimental surfaces are not production Node.

v1.16.0 maturity mapLabels are the contract

Verified in this release

  • One amber binary: run / eval / repl / test / session / mcp
  • TypeScript via oxc type-strip, not tsc
  • Jest-style amber test
  • In-process amber:ai Tensor / LLM / AgentPipeline
  • Node Conformance 5.0: 55/55 fixtures
CURRENT RUNTIME SURFACE

One binary for scripts, tests, and agent tools.

Capabilities below follow the public v1.16.0 manual. Full API tables and benchmarks live on amberjs.com.

One binary

run, eval, repl, test, session, and mcp all live in amber.

$amber run hello.ts

TypeScript without tsc

oxc strips types from .ts / .tsx. Use tsc --noEmit in CI if you want a typecheck.

$amber run app.ts

Opt-in capability sandbox

Turn on --sandbox, then overlay --allow-*, audit JSONL, --seed, and --freeze-time for agent tools.

$amber run --sandbox app.ts

Jest-style tests

amber test with describe / test / expect. --parallel is rejected: isolates are not shared across threads.

$amber test

amber:ai in-process

Tensor, LLM, and AgentPipeline without a Python sidecar. Cargo feature "ai" is empty and is not a product LLM.

$import { Tensor } from "amber:ai"

Node APIs, per-API

fs, http, fetch, Streams, URL, Web Crypto, and more are scored in 55 conformance fixtures, not claimed as drop-in Node.

$amber eval "typeof fetch"
EXECUTION PATH

A readable path from source file to result.

These four stages describe one real execution in order, not a decorative feature list.

01

Input

JavaScript, TypeScript, or TSX source

02

Prepare

oxc strips types; this is not tsc

03

Execute

The Rust-managed V8 isolate runs the code

04

Return

The CLI prints the result or a clear error

TRY THE CORE

Install the official amber binary.

Amberjs is MIT licensed. Prebuilt archives cover macOS arm64/x64, Linux gnu x64/arm64, and Windows x64. Homebrew: brew install zh30/tap/amber. Windows: irm https://get.amberjs.com/install.ps1 | iex.

amber://installzsh
$curl -fsSL https://get.amberjs.com/install.sh | sh
$amber --version
$amber eval "1 + 1"
›2
FAQ

Know the boundaries before evaluating Amberjs.

related workflows
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official links

Official links

Use these canonical links for citations, installation, source review, privacy checks, and support.

WebsiteAmberjs websiteManual, installer, maturity labels, and release notes.GitHubSource, Current Scope, issues, and raw benchmark data.GitHub ReleasesAvailable prebuilt archives and version history.
amber://next

Run it. Read the manual. Decide whether to help shape it.

Amberjs v1.16.0 labels the contract: Stable for everyday scripts and tests, Preview and Experimental while those surfaces tighten.

Enter AmberjsBrowse source