feat(opencode): add typed application layer graph

packages/core/src/cross-spawn-spawner.ts

@@ -24,6 +24,8 @@ import {
 import * as NodeChildProcess from "node:child_process"
 import { PassThrough } from "node:stream"
 import launch from "cross-spawn"
+import { LayerNode } from "./effect/layer-node"
+import { filesystem, path } from "./effect/layer-node-platform"
 
 const toError = (err: unknown): Error => (err instanceof globalThis.Error ? err : new globalThis.Error(String(err)))
 
@@ -501,5 +503,6 @@ export const layer: Layer.Layer<ChildProcessSpawner, never, FileSystem.FileSyste
 )
 
 export const defaultLayer = layer.pipe(Layer.provide(NodeFileSystem.layer), Layer.provide(NodePath.layer))
+export const node = LayerNode.make(layer, [filesystem, path])
 
 export * as CrossSpawnSpawner from "./cross-spawn-spawner"

packages/core/src/database/database.ts

@@ -8,6 +8,7 @@ import { Flag } from "../flag/flag"
 import { isAbsolute, join } from "path"
 import { DatabaseMigration } from "./migration"
 import { InstallationChannel } from "../installation/version"
+import { LayerNode } from "../effect/layer-node"
 
 const makeDatabase = EffectDrizzleSqlite.makeWithDefaults()
 type DatabaseShape = Effect.Success<typeof makeDatabase>
@@ -58,3 +59,5 @@ export const defaultLayer = Layer.unwrap(
     return layerFromPath(path())
   }),
 ).pipe(Layer.provide(Global.defaultLayer))
+
+export const node = LayerNode.make(layerFromPath(path()), [])

packages/core/src/effect/layer-node-platform.ts

@@ -0,0 +1,12 @@
+import { NodeFileSystem, NodePath } from "@effect/platform-node"
+import { LLMClient, RequestExecutor } from "@opencode-ai/llm/route"
+import { FetchHttpClient } from "effect/unstable/http"
+import { LayerNode } from "./layer-node"
+
+export const filesystem = LayerNode.make(NodeFileSystem.layer, [])
+export const path = LayerNode.make(NodePath.layer, [])
+export const httpClient = LayerNode.make(FetchHttpClient.layer, [])
+export const requestExecutor = LayerNode.make(RequestExecutor.layer, [httpClient])
+export const llmClient = LayerNode.make(LLMClient.layer, [requestExecutor])
+
+export * as LayerNodePlatform from "./layer-node-platform"

packages/core/src/effect/layer-node.ts

@@ -0,0 +1,95 @@
+import { Layer } from "effect"
+
+type RuntimeLayer = Layer.Layer<never, unknown, unknown>
+type AnyNode = Node<unknown, unknown>
+type NodeList = readonly [] | readonly [AnyNode, ...AnyNode[]]
+type Output<Item> = [Item] extends [never] ? never : Item extends Node<infer A, unknown> ? A : never
+type Error<Item> = [Item] extends [never] ? never : Item extends Node<unknown, infer E> ? E : never
+type Missing<Required, Dependencies extends NodeList> = Exclude<Required, Output<Dependencies[number]>>
+type CheckDependencies<Implementation extends Layer.Any, Dependencies extends NodeList> = [
+  Missing<Layer.Services<Implementation>, Dependencies>,
+] extends [never]
+  ? unknown
+  : { readonly "Missing dependencies": Missing<Layer.Services<Implementation>, Dependencies> }
+declare const $OutputType: unique symbol
+declare const $ErrorType: unique symbol
+
+export type Node<A, E = never> = {
+  readonly kind: "layer" | "group"
+  readonly implementation?: Layer.Any
+  readonly dependencies: readonly AnyNode[]
+  readonly [$OutputType]?: () => A
+  readonly [$ErrorType]?: () => E
+}
+
+export function make<const Implementation extends Layer.Any, const Items extends NodeList>(
+  implementation: Implementation,
+  dependencies: Items & CheckDependencies<Implementation, NoInfer<Items>>,
+): Node<Layer.Success<Implementation>, Layer.Error<Implementation> | Error<Items[number]>> {
+  return { kind: "layer", implementation: implementation as Layer.Any, dependencies }
+}
+
+export function group<const Items extends NodeList>(
+  dependencies: Items,
+): Node<Output<Items[number]>, Error<Items[number]>> {
+  return { kind: "group", dependencies }
+}
+
+export type Replacement<A = unknown> = {
+  readonly source: Node<A, unknown>
+  readonly replacement: Node<A, unknown>
+}
+
+type CheckReplacementErrors<SourceError, ReplacementError> = [Exclude<ReplacementError, SourceError>] extends [never]
+  ? unknown
+  : { readonly "New replacement errors": Exclude<ReplacementError, SourceError> }
+
+export function replace<A, E, E2>(
+  source: Node<A, E>,
+  replacement: Node<NoInfer<A>, E2> & CheckReplacementErrors<E, NoInfer<E2>>,
+): Replacement<A> {
+  return { source, replacement }
+}
+
+export function buildLayer<A, E>(node: Node<A, E>, options?: { readonly replacements?: readonly Replacement[] }) {
+  const replacements = new Map(options?.replacements?.map((item) => [item.source, item.replacement]))
+  const cache = new Map<AnyNode, RuntimeLayer>()
+  const visiting = new Set<AnyNode>()
+  const stack: AnyNode[] = []
+  const ids = new Map<AnyNode, number>()
+
+  const visit = (input: AnyNode): RuntimeLayer => {
+    const node = replacements.get(input) ?? input
+    const cached = cache.get(node)
+    if (cached) return cached
+    if (visiting.has(node)) {
+      const start = stack.indexOf(node)
+      const cycle = [...stack.slice(start), node].map((item) => `${item.kind}#${ids.get(item)}`).join(" -> ")
+      throw new Error(`Cycle detected in app graph: ${cycle}`)
+    }
+    if (!ids.has(node)) ids.set(node, ids.size + 1)
+    visiting.add(node)
+    stack.push(node)
+    try {
+      const dependencies = node.dependencies.map(visit)
+      const nonEmpty = dependencies as [RuntimeLayer, ...RuntimeLayer[]]
+      const result =
+        node.kind === "group"
+          ? dependencies.length === 0
+            ? Layer.empty
+            : Layer.mergeAll(...nonEmpty)
+          : dependencies.length === 0
+            ? (node.implementation as RuntimeLayer)
+            : Layer.provide(node.implementation as RuntimeLayer, nonEmpty)
+      cache.set(node, result)
+      return result
+    } finally {
+      stack.pop()
+      visiting.delete(node)
+    }
+  }
+
+  return visit(node) as unknown as Layer.Layer<A, E, never>
+}
+
+export * as LayerNode from "./layer-node"

packages/core/src/event.ts

@@ -7,6 +7,7 @@ import { EventSequenceTable, EventTable } from "./event/sql"
 import { Location } from "./location"
 import { externalID, type ExternalID, NonNegativeInt, withStatics } from "./schema"
 import { Identifier } from "./util/identifier"
+import { LayerNode } from "./effect/layer-node"
 import { isDeepStrictEqual } from "node:util"
 
 export const ID = Schema.String.check(Schema.isStartsWith("evt_")).pipe(
@@ -674,5 +675,6 @@ export const layerWith = (options?: LayerOptions) =>
   )
 
 export const layer = layerWith()
+export const node = LayerNode.make(layer, [Database.node])
 
 export const defaultLayer = layer.pipe(Layer.provide(Database.defaultLayer))

packages/core/src/filesystem/ripgrep.ts

@@ -11,6 +11,8 @@ import { CrossSpawnSpawner } from "../cross-spawn-spawner"
 import { Global } from "../global"
 import { NonNegativeInt } from "../schema"
 import { which } from "../util/which"
+import { LayerNode } from "../effect/layer-node"
+import { httpClient } from "../effect/layer-node-platform"
 
 const VERSION = "15.1.0"
 const PLATFORM = {
@@ -480,5 +482,6 @@ export const defaultLayer = layer.pipe(
   Layer.provide(FSUtil.defaultLayer),
   Layer.provide(CrossSpawnSpawner.defaultLayer),
 )
+export const node = LayerNode.make(layer, [FSUtil.node, CrossSpawnSpawner.node, httpClient])
 
 export * as Ripgrep from "./ripgrep"

packages/core/src/filesystem/search.ts

@@ -8,6 +8,7 @@ import { serviceUse } from "../effect/service-use"
 import { makeRuntime } from "../effect/runtime"
 import { Fff } from "#fff"
 import { Ripgrep } from "./ripgrep"
+import { LayerNode } from "../effect/layer-node"
 
 const root = path.join(Global.Path.cache, "fff")
 
@@ -520,6 +521,7 @@ export const defaultLayer: Layer.Layer<Service> = layer.pipe(
   Layer.provide(Ripgrep.defaultLayer),
   Layer.provide(FSUtil.defaultLayer),
 )
+export const node = LayerNode.make(layer, [FSUtil.node, Ripgrep.node])
 
 const { runPromise } = makeRuntime(Service, defaultLayer)
 

packages/core/src/fs-util.ts

@@ -7,6 +7,8 @@ import { Context, Effect, FileSystem, Layer, Schema } from "effect"
 import type { PlatformError } from "effect/PlatformError"
 import { Glob } from "./util/glob"
 import { serviceUse } from "./effect/service-use"
+import { LayerNode } from "./effect/layer-node"
+import { filesystem } from "./effect/layer-node-platform"
 
 export namespace FSUtil {
   export class FileSystemError extends Schema.TaggedErrorClass<FileSystemError>()("FileSystemError", {
@@ -194,6 +196,7 @@ export namespace FSUtil {
   )
 
   export const defaultLayer = layer.pipe(Layer.provide(NodeFileSystem.layer))
+  export const node = LayerNode.make(layer, [filesystem])
 
   // Pure helpers that don't need Effect (path manipulation, sync operations)
   export function mimeType(p: string): string {

packages/core/src/git.ts

@@ -6,6 +6,7 @@ import { ChildProcess } from "effect/unstable/process"
 import { AbsolutePath } from "./schema"
 import { FSUtil } from "./fs-util"
 import { AppProcess } from "./process"
+import { LayerNode } from "./effect/layer-node"
 
 export interface Repo {
   /**
@@ -400,6 +401,7 @@ export const layer = Layer.effect(
 )
 
 export const defaultLayer = layer.pipe(Layer.provide(FSUtil.defaultLayer), Layer.provide(AppProcess.defaultLayer))
+export const node = LayerNode.make(layer, [FSUtil.node, AppProcess.node])
 
 export interface Result {
   readonly exitCode: number

packages/core/src/global.ts

@@ -5,6 +5,7 @@ import os from "os"
 import { Context, Effect, Layer } from "effect"
 import { Flock } from "./util/flock"
 import { Flag } from "./flag/flag"
+import { LayerNode } from "./effect/layer-node"
 
 const app = "opencode"
 const data = path.join(xdgData!, app)
@@ -76,6 +77,7 @@ export const layer = Layer.effect(
 )
 
 export const defaultLayer = layer
+export const node = LayerNode.make(layer, [])
 
 export const layerWith = (input: Partial<Interface>) =>
   Layer.effect(

packages/core/src/models-dev.ts

@@ -8,6 +8,8 @@ import { Hash } from "./util/hash"
 import { FSUtil } from "./fs-util"
 import { InstallationChannel, InstallationVersion } from "./installation/version"
 import { EventV2 } from "./event"
+import { LayerNode } from "./effect/layer-node"
+import { httpClient } from "./effect/layer-node-platform"
 
 export const CatalogModelStatus = Schema.Literals(["alpha", "beta", "deprecated"])
 export type CatalogModelStatus = typeof CatalogModelStatus.Type
@@ -246,5 +248,6 @@ export const defaultLayer = layer.pipe(
   Layer.provide(FSUtil.defaultLayer),
   Layer.provide(EventV2.defaultLayer),
 )
+export const node = LayerNode.make(layer, [FSUtil.node, EventV2.node, httpClient])
 
 export * as ModelsDev from "./models-dev"

packages/core/src/npm.ts

@@ -7,6 +7,8 @@ import { NodeFileSystem } from "@effect/platform-node"
 import { FSUtil } from "./fs-util"
 import { Global } from "./global"
 import { EffectFlock } from "./util/effect-flock"
+import { LayerNode } from "./effect/layer-node"
+import { filesystem } from "./effect/layer-node-platform"
 import { makeRuntime } from "./effect/runtime"
 import { NpmConfig } from "./npm-config"
 
@@ -250,6 +252,7 @@ export const defaultLayer = layer.pipe(
   Layer.provide(Global.layer),
   Layer.provide(NodeFileSystem.layer),
 )
+export const node = LayerNode.make(layer, [FSUtil.node, Global.node, filesystem, EffectFlock.node])
 
 const { runPromise } = makeRuntime(Service, defaultLayer)
 

packages/core/src/process.ts

@@ -3,6 +3,7 @@ import type { PlatformError } from "effect/PlatformError"
 import { ChildProcess } from "effect/unstable/process"
 import { ChildProcessSpawner } from "effect/unstable/process/ChildProcessSpawner"
 import { CrossSpawnSpawner } from "./cross-spawn-spawner"
+import { LayerNode } from "./effect/layer-node"
 
 export class AppProcessError extends Schema.TaggedErrorClass<AppProcessError>()("AppProcessError", {
   command: Schema.String,
@@ -230,5 +231,6 @@ export const layer = Layer.effect(
 )
 
 export const defaultLayer = layer.pipe(Layer.provide(CrossSpawnSpawner.defaultLayer))
+export const node = LayerNode.make(layer, [CrossSpawnSpawner.node])
 
 export * as AppProcess from "./process"

packages/core/src/project.ts

@@ -8,6 +8,7 @@ import { AbsolutePath, withStatics } from "./schema"
 import { FSUtil } from "./fs-util"
 import { Database } from "./database/database"
 import { Git } from "./git"
+import { LayerNode } from "./effect/layer-node"
 import { Hash } from "./util/hash"
 import { ProjectDirectoryTable } from "./project/sql"
 
@@ -159,3 +160,4 @@ export const defaultLayer = layer.pipe(
   Layer.provide(FSUtil.defaultLayer),
   Layer.provide(Git.defaultLayer),
 )
+export const node = LayerNode.make(layer, [Database.node, FSUtil.node, Git.node])

packages/core/src/project/copy.ts

@@ -8,6 +8,7 @@ import { FSUtil } from "../fs-util"
 import { Git } from "../git"
 import { Database } from "../database/database"
 import { EventV2 } from "../event"
+import { LayerNode } from "../effect/layer-node"
 import { Project } from "../project"
 import { ProjectDirectoryTable } from "./sql"
 import { makeStrategies } from "./copy-strategies"
@@ -275,3 +276,4 @@ export const defaultLayer = layer.pipe(
   Layer.provide(Git.defaultLayer),
   Layer.provide(EventV2.defaultLayer),
 )
+export const node = LayerNode.make(layer, [FSUtil.node, Git.node, EventV2.node, Database.node])

packages/core/src/pty/ticket.ts

@@ -4,6 +4,7 @@ import { WorkspaceV2 } from "../workspace"
 import { PositiveInt } from "../schema"
 import { PtyID } from "./schema"
 import { Cache, Context, Duration, Effect, Layer, Schema } from "effect"
+import { LayerNode } from "../effect/layer-node"
 
 const DEFAULT_TTL = Duration.seconds(60)
 const CAPACITY = 10_000
@@ -56,3 +57,4 @@ export const make = (ttl: Duration.Input = DEFAULT_TTL) =>
 export const layer = Layer.effect(Service, make())
 
 export const defaultLayer = layer
+export const node = LayerNode.make(layer, [])

packages/core/src/session/projector.ts

@@ -4,6 +4,7 @@ import { and, desc, eq, sql } from "drizzle-orm"
 import { DateTime, Effect, Layer, Schema } from "effect"
 import { Database } from "../database/database"
 import { EventV2 } from "../event"
+import { LayerNode } from "../effect/layer-node"
 import { SessionEvent } from "./event"
 import { SessionV1 } from "../v1/session"
 import { WorkspaceTable } from "../control-plane/workspace.sql"
@@ -447,3 +448,4 @@ export const layer = Layer.effectDiscard(
 )
 
 export const defaultLayer = layer.pipe(Layer.provide(EventV2.defaultLayer), Layer.provide(Database.defaultLayer))
+export const node = LayerNode.make(layer, [EventV2.node, Database.node])

packages/core/src/util/effect-flock.ts

@@ -6,6 +6,7 @@ import type { FileSystem, Scope } from "effect"
 import type { PlatformError } from "effect/PlatformError"
 import { FSUtil } from "../fs-util"
 import { Global } from "../global"
+import { LayerNode } from "../effect/layer-node"
 import { Hash } from "./hash"
 
 export namespace EffectFlock {
@@ -280,4 +281,5 @@ export namespace EffectFlock {
   )
 
   export const defaultLayer = layer.pipe(Layer.provide(FSUtil.defaultLayer), Layer.provide(Global.layer))
+  export const node = LayerNode.make(layer, [Global.node, FSUtil.node])
 }

packages/opencode/src/account/account.ts

@@ -1,3 +1,5 @@
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { httpClient } from "@opencode-ai/core/effect/layer-node-platform"
 import { Cache, Clock, Duration, Effect, Layer, Option, Schema, SchemaGetter, Context } from "effect"
 import { serviceUse } from "@opencode-ai/core/effect/service-use"
 import {
@@ -456,4 +458,6 @@ export const layer: Layer.Layer<Service, never, AccountRepo.Service | HttpClient
 
 export const defaultLayer = layer.pipe(Layer.provide(AccountRepo.defaultLayer), Layer.provide(FetchHttpClient.layer))
 
+export const node = LayerNode.make(layer, [AccountRepo.node, httpClient])
+
 export * as Account from "./account"

packages/opencode/src/account/repo.ts

@@ -1,3 +1,4 @@
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { eq } from "drizzle-orm"
 import { serviceUse } from "@opencode-ai/core/effect/service-use"
 import { Effect, Layer, Option, Schema, Context } from "effect"
@@ -167,4 +168,6 @@ export const layer = Layer.effect(
 
 export const defaultLayer = layer.pipe(Layer.provide(Database.defaultLayer))
 
+export const node = LayerNode.make(layer, [Database.node])
+
 export * as AccountRepo from "./repo"

packages/opencode/src/agent/agent.ts

@@ -1,3 +1,4 @@
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { PermissionV1 } from "@opencode-ai/core/v1/permission"
 import { Config } from "@/config/config"
 import { serviceUse } from "@opencode-ai/core/effect/service-use"
@@ -430,4 +431,6 @@ export const defaultLayer = layer.pipe(
   Layer.provide(Skill.defaultLayer),
 )
 
+export const node = LayerNode.make(layer, [Config.node, Auth.node, Plugin.node, Skill.node, Provider.node])
+
 export * as Agent from "./agent"

packages/opencode/src/auth/index.ts

@@ -1,3 +1,4 @@
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import path from "path"
 import { Effect, Layer, Record, Result, Schema, Context } from "effect"
 import { NonNegativeInt } from "@opencode-ai/core/schema"
@@ -93,4 +94,6 @@ export const layer = Layer.effect(
 
 export const defaultLayer = layer.pipe(Layer.provide(FSUtil.defaultLayer))
 
+export const node = LayerNode.make(layer, [FSUtil.node])
+
 export * as Auth from "."