Using Mock Implementation Instead of Default in Effect Typescript

import { Effect, Layer } from "effect"

export class TwilioService extends Effect.Service<TwilioService>()(
  "TwilioService",
  {
    accessors: true,
    effect: Effect.gen(function*() {
      const createClient = (accountSid: string, authToken: string) => {
        return { accountSid, authToken }
      }

      return {
        createClient
      }
    })
  }
) {}

const MockTwilioService = new TwilioService({
  createClient: () => ({ accountSid: "test", authToken: "test" })
})

const app = Effect.gen(function*() {
  const client = yield* TwilioService.createClient(
    "AC1234567890",
    "1234567890"
  )

  console.log(client)
}).pipe(Effect.provide(TwilioService.Default))

Effect.runSync(app)