is-kit Reached 50 Stars ⭐ Here’s How We Use It in Production

Описание и применение

В крупном TypeScript‑приложении заменили дублирующие проверки типовых защит на композиционные функции из библиотеки is-kit, сократив код на 249 строк и улучшив читаемость.

Задача

Repeated, boilerplate type guard checks for unknown values caused code duplication, assertion casts, and maintenance pain.

Результат

Consolidated guard logic, eliminated repetitive casts, centralized primitive semantics, and reduced code size by 249 lines, improving maintainability and type safety.

Рабочий процесс

• 1. Install is-kit via pnpm
• 2. Define base guard with define and equalsKey
• 3. Create composable status guard isHttpErrorWithStatus
• 4. Export specific guards (e.g., isUnauthorizedError)
• 5. Wrap library guards in app‑owned helpers for consistent naming
• 6. Replace legacy checks with these helpers across the codebase
• 7. Update team guidelines to prefer combinators like or and and

Доказательства

After using it in the application, the advantages became clearer.

Источник

The first adoption refactor was not just 👇 pnpm add is-kit

Источник