# dominictarr/event-stream

EventStream is like functional programming meets IO

Repository: https://github.com/dominictarr/event-stream
Canonical: https://ross.abutalabs.com/products/event-stream
Language: JavaScript
License: MIT
License Family: permissive
Archived: true
Last push: 2018-11-27T10:44:39+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5491, "days_push": 2836, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2175, forks 146 (observed 2026-08-28T04:06:22.108184+00:00)

## What it is
EventStream is a Node.js library for composing pipelines of event streams using functional operations like map, filter, split, and merge. It lets developers construct pipes of streams of events in a functional programming style.

## Use cases
- transform node.js streams with map and filter
- split and merge streams of events
- build functional pipelines over io streams
- process large files as streaming data
- compose stream transformations in javascript

## When to choose
- maintaining legacy node.js code that already depends on it
- you need simple functional stream composition on old node versions

## When to avoid
- starting a new project - the library is unmaintained since 2018
- security-sensitive pipelines - it was involved in a known npm supply-chain incident
- modern stream processing - prefer native Node streams or maintained alternatives

## Facets
- artifact type: library
- maturity: abandoned
- function: streaming, etl, parser
- domain: developer-tools, backend
- platform: -
- tags: node-streams, functional-programming, pipes, event-streams, unmaintained, data-engineering, nodejs, javascript

## Member repositories
- dominictarr/event-stream (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:22.108184+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 2026-08-30T02:48:55.866820+00:00, confidence not recorded.
  - registry_npm: https://registry.npmjs.org/event-stream (fetched 2026-08-29T10:29:14.709599+00:00, sha 623e72a900bb)
- Data as of 2026-08-30T08:39:29.467469+00:00.