# yytypescript/book

TypeScriptの入門書『サバイバルTypeScript』

Repository: https://github.com/yytypescript/book
Canonical: https://ross.abutalabs.com/products/yytypescript-book
Homepage: https://typescriptbook.jp
Language: TypeScript
License: CC-BY-SA-4.0
License Family: other
Topics: typescript, typescript-tutorials, typescript-documentation
Last push: 2026-08-07T12:25:57+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 96, release rhythm 84, longevity 100
- inputs: {"age_days": 2451, "days_push": 26, "days_rel": 110, "gap_med": 27, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1136, forks 116 (observed 2026-08-28T04:03:43.743615+00:00)

## What it is
Survival TypeScript is an open-source introductory book on TypeScript, freely readable at typescriptbook.jp and written in Japanese. It takes a practice-oriented approach, teaching the TypeScript features most needed for real-world work, alongside related JavaScript knowledge, React, and tooling.

## Use cases
- learn typescript from scratch
- typescript tutorial for programmers coming from other languages
- understand typescript type system basics
- prepare to use typescript in production work
- learn javascript alongside typescript
- free typescript documentation in japanese

## When to choose
- you already know programming but are new to TypeScript
- you want a practical, work-focused subset of TypeScript rather than exhaustive reference
- you prefer learning by building apps before deep language details
- you want a free, open-source, community-maintained book

## When to avoid
- you need complete reference coverage of every TypeScript feature
- you are learning programming for the first time with no prior experience
- you need English-language material

## Facets
- artifact type: learning-resource
- maturity: active
- function: documentation, developer-tools
- domain: programming-languages, tutorials, web-development, frontend, education
- platform: -
- tags: typescript, open-source-book, japanese, beginner-friendly, static-typing, web

## Member repositories
- yytypescript/book (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:43.743615+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 2026-08-30T06:36:34.172401+00:00, confidence not recorded.
  - readme: https://github.com/yytypescript/book (fetched 2026-08-28T04:03:43.743615+00:00, sha 69e4dc97567f)
  - homepage: https://typescriptbook.jp (fetched 2026-08-29T12:41:44.528647+00:00, sha c8a47e90526b)
  - site_page: https://typescriptbook.jp/about (fetched 2026-08-29T12:41:44.532280+00:00, sha 38c9bb910de5)
  - site_page: https://typescriptbook.jp/overview/features (fetched 2026-08-29T12:41:44.534910+00:00, sha df40f44514a3)
- Data as of 2026-08-30T08:39:29.467469+00:00.