Default Services
Effect comes equipped with five pre-built services:
ts
type DefaultServices = Clock | Console | Random | ConfigProvider | Tracer
ts
type DefaultServices = Clock | Console | Random | ConfigProvider | Tracer
When we employ these services, there's no need to explicitly provide their implementations. Effect automatically supplies live versions of these services to our effects, sparing us from manual setup.
ts
import {Effect ,Clock ,Console } from "effect"constprogram =Effect .gen (function* (_ ) {constnow = yield*_ (Clock .currentTimeMillis )yield*_ (Console .log (`Application started at ${newDate (now )}`))})
ts
import {Effect ,Clock ,Console } from "effect"constprogram =Effect .gen (function* (_ ) {constnow = yield*_ (Clock .currentTimeMillis )yield*_ (Console .log (`Application started at ${newDate (now )}`))})
As you can observe, even if our program utilizes both Clock
and Console
, the R
parameter, representing the contextual data required for the effect to execute, remains set to never
.
ts
Effect<void, never, never>
ts
Effect<void, never, never>
Effect takes care of handling these services seamlessly for us.