Effect

Accord works without Effect. If you use Effect, @marcelsud/accord/effect turns your model into an Effect service whose calls are lazy Effects.

Install

Effect is an optional peer dependency. Install effect@^4.1.2:

npm

npm install effect@^4.1.2

yarn

yarn add effect@^4.1.2

pnpm

pnpm add effect@^4.1.2

bun

bun add effect@^4.1.2

Usage

import { Effect, Layer } from 'effect'
import { effectify } from '@marcelsud/accord/effect'
import { Bank as BankModel, DepositRules } from './domain.ts'

const Bank = effectify(BankModel, 'Bank')
const RulesLive = Layer.succeed(effectify(DepositRules), { maximum: 1_000 })
const BankLive = Bank.layer.pipe(Layer.provide(RulesLive))

const program = Effect.gen(function* () {
  const bank = yield* Bank
  const id = 'a-1'

  yield* bank.account.open(id)
  const receipt = yield* bank.account.deposit(id, 100)
  return yield* bank.summary.get(id, { atLeast: receipt })
})

const summary = await Effect.runPromise(Effect.provide(program, BankLive))
console.log(summary) // { balance: 100 }

• effectify(BankModel, 'Bank') creates a named service key with a layer.
• The layer requires the model's declared dependencies. Provide them with layers built from effectify(Dependency).
• A successful tuple becomes the Effect's value; its error becomes a typed failure.

The bank domain is in the Bank example.

Next

See the Effect API reference.