xzhavilla / fx

affex

Installation

The package is available via npm:

npm install affex

Usage

import { fx } from 'affex'

// Define effect interface.
interface Log {
  readonly [fx.uri]?: unique symbol
  (message: string): void
}

// Create effect tag.
const tag = fx.tag<Log>()

// Derive effector constructor.
const log = fx.function(tag)

// Perform effect in generator function.
function* main() {
  yield* log('hello, world')
}

// Create layer with effect handler.
function ConsoleLog() {
  return fx.layer().with(tag, (message) => console.log(message))
}

// Run program with provided layer.
fx.runPromise(main, ConsoleLog())

License

MIT