# google/traceur-compiler

Traceur is a JavaScript.next-to-JavaScript-of-today compiler

Repository: https://github.com/google/traceur-compiler
Canonical: https://ross.abutalabs.com/products/traceur-compiler
Language: JavaScript
License: Apache-2.0
License Family: permissive
Archived: true
Last push: 2024-12-10T08:25:16+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4907, "days_push": 631, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8127, forks 566 (observed 2026-08-28T04:10:13.791181+00:00)

## What it is
Traceur is a JavaScript.next-to-JavaScript-of-today compiler that transpiles ES6 and experimental ES.next features into JavaScript that runs in current engines. It was created by Google to let developers try proposed language features and inform the ECMAScript standards process.

## Use cases
- compile ES6 code to run in older browsers
- try out experimental JavaScript language features today
- transpile modern JavaScript syntax to ES5
- experiment with proposed ECMAScript features in a REPL
- evaluate new JS syntax before it's standardized

## When to choose
- you need to experiment with proposed ES.next features not supported by other transpilers
- you're researching or giving feedback on future JavaScript language design
- you must transpile to very old JavaScript engines

## When to avoid
- you need a modern, actively developed ES6+ transpiler for production - use Babel or SWC instead
- your build toolchain already handles modern JavaScript via TypeScript or esbuild
- you only need standard, widely supported ES6+ features

## Facets
- artifact type: library
- maturity: maintenance
- function: compiler, interpreter, developer-tools
- domain: compilers, programming-languages, web-development, developer-tools
- platform: browser, cli
- tags: javascript, es6, transpiler, esnext, babel-alternative, web-server, nodejs

## Member repositories
- google/traceur-compiler (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:13.791181+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 2026-08-29T17:30:23.966328+00:00, confidence not recorded.
  - readme: https://github.com/google/traceur-compiler (fetched 2026-08-28T04:10:13.791181+00:00, sha 6592ce662664)
- Data as of 2026-08-30T08:39:29.467469+00:00.