# petkaantonov/bluebird

:bird: :zap: Bluebird is a full featured promise library with unmatched performance.

Repository: https://github.com/petkaantonov/bluebird
Canonical: https://ross.abutalabs.com/products/bluebird
Homepage: http://bluebirdjs.com
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2024-11-07T20:26:46+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4743, "days_push": 664, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 20490, forks 2311 (observed 2026-08-28T04:11:30.153147+00:00)

## What it is
Bluebird is a full-featured Promises/A+ compliant promise library for JavaScript with a focus on performance and rich utility methods like .map, .promisify, and cancellation. Its maintainer now recommends native promises for most use cases, reserving Bluebird for very old browsers, EoL Node.js, or debugging with warnings/monitoring.

## Use cases
- add promise support to old browsers like IE8
- promisify callback-based Node.js APIs
- run concurrent async operations with concurrency limits using .map
- find unhandled promise rejections with warnings and monitoring
- support end-of-life Node.js versions without native promises

## When to choose
- you must support very old browsers or EoL Node.js versions
- you want warnings/monitoring to track down async bugs in a legacy codebase
- you're maintaining an existing codebase already built on Bluebird

## When to avoid
- starting a new project on modern Node.js or browsers - use native promises
- you only need basic utilities like .map, which native platforms now provide
- you want a library under active feature development

## Facets
- artifact type: library
- maturity: maintenance
- function: concurrency, developer-tools
- domain: developer-tools, web-development
- platform: browser, cross-platform
- tags: promises, async, promises-aplus, flow-control, javascript, nodejs

## Member repositories
- petkaantonov/bluebird (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:30.153147+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 2026-08-29T16:58:47.267684+00:00, confidence not recorded.
  - readme: https://github.com/petkaantonov/bluebird (fetched 2026-08-28T04:11:30.153147+00:00, sha 1ce3bc225768)
  - registry_npm: https://registry.npmjs.org/bluebird (fetched 2026-08-29T07:57:47.194625+00:00, sha 82cc60e130aa)
- Data as of 2026-08-30T08:39:29.467469+00:00.