asyncforge

asyncforge allows you to remove singletons from your codebase with the use of AsyncLocalStorage.

It provides helpers to build Next.js-style helpers to access "singletons".

Install

npm i asyncforge

Usage

import { create, memo } from 'asyncforge'

const a = memo()
const b = memo()

const store = create()

store.run(() => {
  a.set(42)
  b.set(123)

  // simulate an event loop turn
  setImmediate(() => {
    console.log('-- first event loop turn --')
    console.log('a', a())
    console.log('b', b())
  })
})

create(() => {
  a.set(43)
  b.set(321)

  // simulate an event loop turn
  setImmediate(() => {
    console.log('-- second event loop turn --')
    console.log('a', a())
    console.log('b', b())

    store.run(() => {
      setImmediate(() => {
        console.log('-- third event loop turn --')
        console.log('a', a())
        console.log('b', b())
      })
    })

    setImmediate(() => {
      store.enterWith()
      console.log('-- fourth event loop turn --')
      console.log('a', a())
      console.log('b', b())
    })
  })
})

TypeScript

You can call the asyncforge functions in a type-safe way:

import { create, memo } from "asyncforge";
const memoNum = memo<number>();
const test = memo<string>();

const store = create()

store.run(() => {
  // This is okay for TypeScript, since you're passing a number
  memoNum.set(123);


  // This will not build
  memoNum.set('wrong');
})

store.run(() => {
  // The `result` var will be of type `number`
  const result = memoNum()
})

License

MIT