Variable Tag

Tag: <S extends unknown>(id: string) => Tag<S>

Creates a Tag for identifying a service type.

Type Declaration

- <S extends unknown>(id: string): Tag<S>
- Type Parameters
  - S extends unknown
  Parameters
  - id: string
    Unique identifier for this tag (usually the service name)
  Returns Tag<S>
  A Tag that can be used to request the service

Example

interface Logger {
  log(message: string): void
}

const Logger = Tag<Logger>("Logger")

// Now Logger can be used to request the Logger service
const program = IO.service(Logger).flatMap(logger =>
  IO.sync(() => logger.log("Hello!"))
)