requirements management

SKILL.md

The third type parameter in Effect represents requirements - services and dependencies the effect needs to run:

Effect uses a powerful dependency injection system based on Context and Layer.

The primary reason to define services is testability. Every external dependency (API calls, databases, file systems, third-party SDKs) MUST be wrapped in a Context.Tag service so that tests can provide a test implementation instead of hitting real systems. This is how Effect achieves 100% test coverage — business logic depends only on service interfaces, and tests swap in test layers that control all I/O.

當用戶詢問“效果服務”、“依賴注入”、“Effect.Tag”、“Context.Tag”、“Layer”、“Effect.provide”、“Effect.provideService”、“服務實現”、“管理依賴關係”、“Layer.succeed”、“Layer.effect”、“Layer.scoped”、“組合圖層”時，應該使用此技能。 “Layer.merge”、“Layer.provide”、“默認服務”、“層記憶”、“可測試性”、“測試層”、“模擬服務”，或者需要了解 Effect 如何處理需求 (R) 類型參數。 來源：andrueandersoncs/claude-skill-effect-ts。

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