# Page Not Found

The URL `intro/what-is-typescript` does not exist.

You might be looking for one of these pages:
- [なぜTypeScriptを使うのか？](https://typescript-jp.gitbook.io/deep-dive/getting-started/why-typescript.md)
- [strictNullChecks](https://typescript-jp.gitbook.io/deep-dive/intro/strictnullchecks.md)
- [noImplicitAny](https://typescript-jp.gitbook.io/deep-dive/intro/noimplicitany.md)
- [オプション](https://typescript-jp.gitbook.io/deep-dive/intro.md)
- [Prettier](https://typescript-jp.gitbook.io/deep-dive/intro-2/prettier.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://typescript-jp.gitbook.io/deep-dive/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://typescript-jp.gitbook.io/deep-dive/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/deep-dive/getting-started/why-typescript.md`)
- Use `Accept: text/markdown` header for content negotiation