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import { Context, Effect, Layer } from "effect"
import { LayerNode } from "@opencode-ai/core/effect/layer-node"
class Value extends Context.Service<Value, { readonly value: string }>()("test/LayerNodeValue") {}
class Greeting extends Context.Service<Greeting, { readonly value: string }>()("test/LayerNodeGreeting") {}
class Left extends Context.Service<Left, { readonly value: string }>()("test/LayerNodeLeft") {}
class Right extends Context.Service<Right, { readonly value: string }>()("test/LayerNodeRight") {}
class Database extends Context.Service<Database, { readonly name: string }>()("test/GraphDatabase") {}
class Users extends Context.Service<Users, { readonly list: Effect.Effect<string[]> }>()("test/GraphUsers") {}
class App extends Context.Service<App, { readonly run: Effect.Effect<string[]> }>()("test/GraphApp") {}
const tags = LayerNode.tags({ app: [] })
const make = tags.make("app")
const build = <A, E>(root: LayerNode.Node<A, E, any>, replacements?: readonly LayerNode.Replacement[]) =>
LayerNode.compile(root, replacements) as Layer.Layer<A, E>
const valueLayer = Layer.succeed(Value, Value.of({ value: "production" }))
const greetingLayer = Layer.effect(
Greeting,
Effect.map(Value, (value) => Greeting.of({ value: `hello ${value.value}` })),
)
const value = make({ service: Value, layer: valueLayer, deps: [] })
const greeting = make({ service: Greeting, layer: greetingLayer, deps: [value] })
describe("layer node", () => {
test("builds an untagged graph", async () => {
const value = LayerNode.make({ service: Value, layer: valueLayer, deps: [] })
const greeting = LayerNode.make({ service: Greeting, layer: greetingLayer, deps: [value] })
const program = Effect.map(Greeting, (item) => item.value).pipe(
Effect.provide(LayerNode.compile(LayerNode.group([greeting]))),
)
expect(await Effect.runPromise(program)).toBe("hello production")
})
test("builds a dependency graph", async () => {
const program = Effect.map(Greeting, (item) => item.value).pipe(Effect.provide(build(LayerNode.group([greeting]))))
expect(await Effect.runPromise(program)).toBe("hello production")
})
test("exposes roots but hides transitive dependencies", () => {
const layer = build(LayerNode.group([greeting]))
const check: Layer.Layer<Greeting> = layer
void check
})
test("preserves branch-specific implementations across roots", async () => {
const firstValue = make({ service: Value, layer: Layer.succeed(Value, Value.of({ value: "first" })), deps: [] })
const secondValue = make({ service: Value, layer: Layer.succeed(Value, Value.of({ value: "second" })), deps: [] })
const leftLayer = Layer.effect(
Left,
Effect.map(Value, (item) => Left.of({ value: item.value })),
)
const rightLayer = Layer.effect(
Right,
Effect.map(Value, (item) => Right.of({ value: item.value })),
)
const left = make({ service: Left, layer: leftLayer, deps: [firstValue] })
const right = make({ service: Right, layer: rightLayer, deps: [secondValue] })
const layer = build(LayerNode.group([left, right]))
const program = Effect.gen(function* () {
return [(yield* Left).value, (yield* Right).value]
}).pipe(Effect.provide(layer))
expect(await Effect.runPromise(program)).toEqual(["first", "second"])
})
test("requires unbound nodes to be replaced before compilation", async () => {
const unbound = LayerNode.unbound(Value, tags.values.app)
const greeting = make({ service: Greeting, layer: greetingLayer, deps: [unbound] })
const tree = LayerNode.group([greeting])
expect(() => LayerNode.compile(tree)).toThrow("Unbound layer node: test/LayerNodeValue")
const layer = LayerNode.compile(tree, [[unbound, value]]) as Layer.Layer<Greeting>
const program = Effect.map(Greeting, (item) => item.value).pipe(Effect.provide(layer))
expect(await Effect.runPromise(program)).toBe("hello production")
})
test("replaces a node with a closed layer", async () => {
const replacement = Layer.succeed(Value, Value.of({ value: "simulation" }))
const program = Effect.map(Greeting, (item) => item.value).pipe(
Effect.provide(build(LayerNode.group([greeting]), [[value, replacement]])),
)
expect(await Effect.runPromise(program)).toBe("hello simulation")
})
test("replaces every use of the same layer", async () => {
const leftLayer = Layer.effect(
Left,
Effect.map(Value, (item) => Left.of({ value: item.value })),
)
const rightLayer = Layer.effect(
Right,
Effect.map(Value, (item) => Right.of({ value: item.value })),
)
const left = make({ service: Left, layer: leftLayer, deps: [value] })
const right = make({ service: Right, layer: rightLayer, deps: [value] })
const replacement = Layer.succeed(Value, Value.of({ value: "replaced" }))
const layer = build(LayerNode.group([left, right]), [[value, replacement]])
const program = Effect.gen(function* () {
return [(yield* Left).value, (yield* Right).value]
}).pipe(Effect.provide(layer))
expect(await Effect.runPromise(program)).toEqual(["replaced", "replaced"])
})
test("does not acquire an unused replacement", async () => {
let acquisitions = 0
const other = make({ service: Left, layer: Layer.succeed(Left, Left.of({ value: "other" })), deps: [] })
const replacement = Layer.effect(
Left,
Effect.sync(() => {
acquisitions++
return Left.of({ value: "replacement" })
}),
)
await Effect.runPromise(
Effect.map(Greeting, (item) => item.value).pipe(
Effect.provide(build(LayerNode.group([greeting]), [[other, replacement]])),
),
)
expect(acquisitions).toBe(0)
})
test("replaces a node without acquiring its dependencies", async () => {
let acquisitions = 0
const dependencyLayer = Layer.effect(
Value,
Effect.sync(() => {
acquisitions++
return Value.of({ value: "dependency" })
}),
)
const dependency = make({ service: Value, layer: dependencyLayer, deps: [] })
const original = make({ service: Greeting, layer: greetingLayer, deps: [dependency] })
const replacement = make({
service: Greeting,
layer: Layer.succeed(Greeting, Greeting.of({ value: "replacement" })),
deps: [],
})
const program = Effect.map(Greeting, (item) => item.value).pipe(
Effect.provide(build(LayerNode.group([original]), [[original, replacement]])),
)
expect(await Effect.runPromise(program)).toBe("replacement")
expect(acquisitions).toBe(0)
})
test("applies later replacements inside earlier replacement nodes", async () => {
const original = make({ service: Greeting, layer: greetingLayer, deps: [value] })
const replacement = make({ service: Greeting, layer: greetingLayer, deps: [value] })
const program = Effect.map(Greeting, (item) => item.value).pipe(
Effect.provide(
build(LayerNode.group([original]), [
[original, replacement],
[value, Layer.succeed(Value, Value.of({ value: "replacement dependency" }))],
]),
),
)
expect(await Effect.runPromise(program)).toBe("hello replacement dependency")
})
test("hoists and compiles tagged graphs", async () => {
const tags = LayerNode.tags({ location: ["global"], global: [] })
const global = tags.make("global")
const location = tags.make("location")
const database = global({
service: Database,
layer: Layer.succeed(Database, Database.of({ name: "Alice" })),
deps: [],
})
const users = location({
service: Users,
layer: Layer.effect(
Users,
Effect.gen(function* () {
const db = yield* Database
return Users.of({ list: Effect.succeed([db.name]) })
}),
),
deps: [database],
})
const app = location({
service: App,
layer: Layer.effect(
App,
Effect.gen(function* () {
const service = yield* Users
return App.of({ run: service.list })
}),
),
deps: [users],
})
const result = LayerNode.hoist(LayerNode.group([app]), tags.values.global)
expect(result.node.dependencies[0]?.dependencies[0]?.dependencies[0]).toMatchObject({
kind: "group",
dependencies: [],
})
expect(result.hoisted.dependencies).toEqual([database])
const layer = LayerNode.compile(result.node).pipe(
Layer.provide(LayerNode.compile(result.hoisted)),
) as unknown as Layer.Layer<App>
const program = Effect.gen(function* () {
return yield* (yield* App).run
}).pipe(Effect.provide(layer))
expect(await Effect.runPromise(program)).toEqual(["Alice"])
})
test("rejects conflicting hoisted implementations", () => {
const tags = LayerNode.tags({ location: ["global"], global: [] })
const global = tags.make("global")
const location = tags.make("location")
const first = global({
service: Database,
layer: Layer.succeed(Database, Database.of({ name: "first" })),
deps: [],
})
const second = global({
service: Database,
layer: Layer.succeed(Database, Database.of({ name: "second" })),
deps: [],
})
const left = location({
service: Users,
layer: Layer.effect(Users, Effect.as(Database, Users.of({ list: Effect.succeed([]) }))),
deps: [first],
})
const right = location({
service: App,
layer: Layer.effect(App, Effect.as(Database, App.of({ run: Effect.succeed([]) }))),
deps: [second],
})
expect(() => LayerNode.hoist(LayerNode.group([left, right]), tags.values.global)).toThrow(
"Tag global has conflicting implementations for test/GraphDatabase",
)
})
test("treats dependency groups as transparent while hoisting", () => {
const tags = LayerNode.tags({ location: ["global"], global: [] })
const global = tags.make("global")
const location = tags.make("location")
const database = global({
service: Database,
layer: Layer.succeed(Database, Database.of({ name: "Alice" })),
deps: [],
})
const users = location({
service: Users,
layer: Layer.effect(Users, Effect.as(Database, Users.of({ list: Effect.succeed([]) }))),
deps: [LayerNode.group([database])],
})
const result = LayerNode.hoist(LayerNode.group([users]), tags.values.global)
expect(result.node.dependencies[0]?.dependencies[0]?.dependencies[0]).toMatchObject({
kind: "group",
dependencies: [],
})
})
})
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