Defining Errors in Service Methods
How one defines errors in the service methods in generic way? So I can provide different implementations for the same Tag. Example:
import { Effect, Context, Layer } from "effect"
import { Flour, Sugar } from "./Ingredients"
export interface Recipe {
readonly steps: Effect.Effect<never, ???, ReadonlyArray<string>>
}
export const Recipe = Context.Tag<Recipe>()
// $ExpectType Layer<Sugar | Flour, never, Recipe>
export const Recipe1Live = Layer.effect(
Recipe,
Effect.gen(function* (_) {
const sugar = yield* _(Sugar)
const flour = yield* _(Flour)
return Recipe.of({
// $ExpectType Effect<never, never, ReadonlyArray<string>>
steps: Effect.all([sugar.grams(200), flour.cups(1)])
})
})
)
// $ExpectType Layer<Eggs, never, Recipe>
export const Recipe2Live = Layer.effect(
Recipe,
Effect.gen(function* (_) {
const flour = yield* _(Eggs)
return Recipe.of({
// $ExpectType Effect<never, NoEggsError, ReadonlyArray<string>>
steps: Effect.fail(new NoEggsError())
})
})
)import { Effect, Context, Layer } from "effect"
import { Flour, Sugar } from "./Ingredients"
export interface Recipe {
readonly steps: Effect.Effect<never, ???, ReadonlyArray<string>>
}
export const Recipe = Context.Tag<Recipe>()
// $ExpectType Layer<Sugar | Flour, never, Recipe>
export const Recipe1Live = Layer.effect(
Recipe,
Effect.gen(function* (_) {
const sugar = yield* _(Sugar)
const flour = yield* _(Flour)
return Recipe.of({
// $ExpectType Effect<never, never, ReadonlyArray<string>>
steps: Effect.all([sugar.grams(200), flour.cups(1)])
})
})
)
// $ExpectType Layer<Eggs, never, Recipe>
export const Recipe2Live = Layer.effect(
Recipe,
Effect.gen(function* (_) {
const flour = yield* _(Eggs)
return Recipe.of({
// $ExpectType Effect<never, NoEggsError, ReadonlyArray<string>>
steps: Effect.fail(new NoEggsError())
})
})
)
