Hoisting Dependencies from Service Methods to Layer

import { FileSystem } from "@effect/platform"
import { NodeFileSystem } from "@effect/platform-node"
import { Context, Effect, Layer } from "effect"

class Config extends Context.Tag("Config")<Config, { cacheDir: string }>() {}

class Logger extends Context.Tag("Logger")<Logger, { log: (msg: string) => void }>() {}

const lookup = (key: string) =>
  Effect.gen(function*() {
    const fs = yield* FileSystem.FileSystem
    const logger = yield* Logger
    logger.log("hello")
    const config = yield* Config
    return yield* fs.readFileString(`${config.cacheDir}/${key}`)
  })

class Cache extends Effect.Service<Cache>()("app/Cache", {
  effect: Effect.gen(function*() {
    const layer = Layer.mergeAll(
      Layer.succeed(Config, yield* Config),
      Layer.succeed(Logger, yield* Logger),
      Layer.succeed(FileSystem.FileSystem, yield* FileSystem.FileSystem)
    )
    return {
      lookup: (key: string) => lookup(key).pipe(Effect.provide(layer))
    } as const
  }),
  dependencies: [NodeFileSystem.layer]
}) {}

import { FileSystem } from "@effect/platform"
import { NodeFileSystem } from "@effect/platform-node"
import { Context, Effect, Layer } from "effect"

class Config extends Context.Tag("Config")<Config, { cacheDir: string }>() {}

class Logger extends Context.Tag("Logger")<Logger, { log: (msg: string) => void }>() {}

const lookup = (key: string) =>
  Effect.gen(function*() {
    const fs = yield* FileSystem.FileSystem
    const logger = yield* Logger
    logger.log("hello")
    const config = yield* Config
    return yield* fs.readFileString(`${config.cacheDir}/${key}`)
  })

class Cache extends Effect.Service<Cache>()("app/Cache", {
  effect: Effect.gen(function*() {
    const layer = Layer.mergeAll(
      Layer.succeed(Config, yield* Config),
      Layer.succeed(Logger, yield* Logger),
      Layer.succeed(FileSystem.FileSystem, yield* FileSystem.FileSystem)
    )
    return {
      lookup: (key: string) => lookup(key).pipe(Effect.provide(layer))
    } as const
  }),
  dependencies: [NodeFileSystem.layer]
}) {}