# arethetypeswrong/arethetypeswrong.github.io

Tool for analyzing TypeScript types of npm packages

Repository: https://github.com/arethetypeswrong/arethetypeswrong.github.io
Canonical: https://ross.abutalabs.com/products/arethetypeswronggithubio
Homepage: https://arethetypeswrong.github.io
Language: TypeScript
License: MIT
License Family: permissive
Last push: 2026-07-09T22:22:35+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 91, release rhythm 86, longevity 93
- inputs: {"age_days": 1315, "days_push": 55, "days_rel": 96, "gap_med": 0, "n_releases_24m": 22}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1598, forks 65 (observed 2026-08-28T04:05:09.329669+00:00)

## What it is
A tool that analyzes npm package contents for issues with their TypeScript types, particularly ESM-related module resolution problems across node10, node16, and bundler resolution modes. It is available both as a website for exploring packages and as a CLI (@arethetypeswrong/cli) for checking packages on disk.

## Use cases
- check if my npm package's TypeScript types resolve correctly
- detect ESM/CJS module resolution issues before publishing
- verify package exports work in node16 and bundler module resolution
- find out why consumers get 'no types' errors for my package
- lint TypeScript type resolution in CI for a published library
- analyze npm pack output for type problems

## When to choose
- you publish npm packages with TypeScript types and want to catch resolution issues before release
- you maintain a dual ESM/CJS library and need to verify exports in multiple module resolution modes
- you want to add type-resolution checks to a CI pipeline via the CLI

## When to avoid
- you need general TypeScript type checking or linting of source code rather than package type resolution
- you need runtime testing of package behavior rather than static type analysis

## Facets
- artifact type: cli-tool
- maturity: active
- function: developer-tools, testing, parser
- domain: developer-tools, web-development, frontend, backend
- platform: cli
- tags: typescript, npm-packages, module-resolution, esm, cjs, package-publishing, type-checking, nodejs, web-server

## Member repositories
- arethetypeswrong/arethetypeswrong.github.io (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:09.329669+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 2026-08-30T03:53:16.030410+00:00, confidence not recorded.
  - readme: https://github.com/arethetypeswrong/arethetypeswrong.github.io (fetched 2026-08-28T04:05:09.329669+00:00, sha 8582b2be0a1f)
  - homepage: https://arethetypeswrong.github.io (fetched 2026-08-29T11:24:53.025915+00:00, sha 495b3f5801f0)
- Data as of 2026-08-30T08:39:29.467469+00:00.