# flow-typed/flow-typed

A central repository for Flow library definitions

Repository: https://github.com/flow-typed/flow-typed
Canonical: https://ross.abutalabs.com/products/flow-typed
Homepage: https://flow-typed.github.io/flow-typed/
Language: JavaScript
License: MIT
License Family: permissive
Topics: flow, cli, libdefs, hacktoberfest, flowtype, types
Last push: 2026-08-13T20:53:17+00:00

## Health v2 (maintenance only)
Score: 78/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 40, longevity 100
- inputs: {"age_days": 4002, "days_push": 20, "days_rel": 477, "gap_med": 14, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3757, forks 1310 (observed 2026-08-28T04:08:17.811183+00:00)

## What it is
A central repository of high-quality third-party Flow library type definitions (libdefs), plus a CLI tool to install and manage them in Flow projects. It lets Flow type-check code that uses untyped third-party JavaScript libraries.

## Use cases
- install flow type definitions for third-party libraries
- type-check untyped npm packages with flow
- find libdefs for a javascript library
- write and contribute flow library definitions
- keep flow typedefs up to date with package versions

## When to choose
- your project uses Flow and depends on libraries not written in Flow
- you want typed auto-complete and error checking for third-party modules
- you need a maintained source of community Flow libdefs

## When to avoid
- your project uses TypeScript instead of Flow
- you only use libraries that ship their own Flow types
- you need active feature development rather than maintenance

## Facets
- artifact type: library
- maturity: maintenance
- function: type-system, cli, developer-tools
- domain: developer-tools, programming-languages
- platform: cli, cross-platform
- tags: flow, flowtype, libdefs, type-definitions, npm, javascript, nodejs

## Member repositories
- flow-typed/flow-typed (main) score 78

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:17.811183+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 2026-08-29T18:28:55.819907+00:00, confidence not recorded.
  - readme: https://github.com/flow-typed/flow-typed (fetched 2026-08-28T04:08:17.811183+00:00, sha 017c05f8f375)
  - homepage: https://flow-typed.github.io/flow-typed/ (fetched 2026-08-29T09:23:16.404927+00:00, sha bc3a8ed33db7)
  - registry_npm: https://registry.npmjs.org/flow-typed (fetched 2026-08-29T09:23:16.413792+00:00, sha 4ac7c4577f88)
- Data as of 2026-08-30T08:39:29.467469+00:00.