# typedgrammar/typed-japanese

🌸 Learn Japanese grammar with TypeScript

Repository: https://github.com/typedgrammar/typed-japanese
Canonical: https://ross.abutalabs.com/products/typed-japanese
Homepage: https://typedgrammar.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: japanese, language-learning, typescript, computational-linguistics, dsl, grammar, japanese-grammar, nlp, type-level-programming, type-system, language-verification, typescript-types
Last push: 2026-06-21T09:25:21+00:00

## Health v2 (maintenance only)
Score: 59/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 88, release rhythm 35, longevity 38
- inputs: {"age_days": 533, "days_push": 73, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1946, forks 24 (observed 2026-08-28T04:05:57.829998+00:00)

## What it is
Typed Japanese is a TypeScript type-level library that encodes Japanese grammar rules as a DSL, letting users write and verify grammatically correct Japanese sentences via the TypeScript compiler. It also powers an interactive course and playground that teach Japanese grammar through type-checked code examples.

## Use cases
- learn japanese grammar with typescript
- verify japanese sentence grammar using the type checker
- model japanese verb conjugations as types
- build a dsl for japanese sentence structure
- use type-level programming to validate natural language
- let llms output grammar analysis that can be type-checked

## When to choose
- you already know TypeScript and want to learn Japanese grammar hands-on
- you want compiler-verified construction of Japanese sentences
- you need a structured, verifiable intermediate format for Japanese grammar analysis
- you want an interactive, beginner-friendly grammar course with type-checked examples

## When to avoid
- you need production NLP parsing of arbitrary Japanese text
- you want a general-purpose Japanese translation or dictionary tool
- you don't use TypeScript and won't adopt its type system
- you need full coverage of Japanese grammar beyond the supported subset

## Facets
- artifact type: library
- maturity: active
- function: type-system, nlp, parser, programming-language
- domain: education, programming-languages
- platform: browser
- tags: japanese-grammar, language-learning, type-level-programming, dsl, computational-linguistics, interactive-course, compiler-verification, natural-language-processing, localization, typescript, nodejs, web

## Member repositories
- typedgrammar/typed-japanese (main) score 59

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:57.829998+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 2026-08-30T03:07:21.298087+00:00, confidence not recorded.
  - readme: https://github.com/typedgrammar/typed-japanese (fetched 2026-08-28T04:05:57.829998+00:00, sha 7bb822df8cf6)
  - homepage: https://typedgrammar.com (fetched 2026-08-29T10:47:11.739331+00:00, sha ce0cfce2b9bd)
- Data as of 2026-08-30T08:39:29.467469+00:00.