# amireh/happypack

Happiness in the form of faster webpack build times.

Repository: https://github.com/amireh/happypack
Canonical: https://ross.abutalabs.com/products/happypack
Language: JavaScript
License: MIT
License Family: permissive
Topics: webpack, build-tool, performance
Archived: true
Last push: 2020-09-04T00:55:20+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3902, "days_push": 2190, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4233, forks 127 (observed 2026-08-28T04:08:39.490417+00:00)

## What it is
HappyPack is a webpack plugin and loader that speeds up initial webpack builds by running file transformations (like babel-loader) in parallel across multiple processes. It is now in maintenance mode, with webpack's native improvements and thread-loader recommended as alternatives.

## Use cases
- speed up slow webpack builds
- run babel-loader in parallel
- reduce webpack compilation time
- parallelize file transforms in webpack
- faster initial builds for large JavaScript projects

## When to choose
- you are stuck on an older webpack version with slow builds
- you want multi-process loader execution on webpack 2-3

## When to avoid
- you use webpack 4 or newer - prefer thread-loader or webpack 5's parallelism
- your loaders rely on unsupported webpack loader APIs
- you need actively maintained tooling

## Facets
- artifact type: plugin
- maturity: maintenance
- function: build-tool, concurrency, developer-tools
- domain: web-development, frontend, developer-tools, performance
- platform: -
- tags: webpack-plugin, parallel-builds, loader, build-performance, deprecated-alternative, nodejs, javascript

## Member repositories
- amireh/happypack (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:39.490417+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 2026-08-29T18:22:19.296872+00:00, confidence not recorded.
  - readme: https://github.com/amireh/happypack (fetched 2026-08-28T04:08:39.490417+00:00, sha 94a1f6e250f7)
  - registry_npm: https://registry.npmjs.org/happypack (fetched 2026-08-29T09:12:25.469418+00:00, sha 7a7c1bb6ac36)
- Data as of 2026-08-30T08:39:29.467469+00:00.