reducs

--- package.json (entry) ---
{
  "name": "reducs",
  "author": "Tony Mobily",
  "description": "",
  "license": "ISC",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "version": "1.0.1"
}


--- index.js (entry) ---
let state = null
const beforeSetStateCallbacks = []
const afterSetStateCallbacks = []

export const beforeSetState = (fn) => beforeSetStateCallbacks.push(fn)
export const afterSetState = (fn) => afterSetStateCallbacks.push(fn)

export const setState = async (key, value) => {
  if (state === null) state = {}
  for (const fn of beforeSetStateCallbacks) await fn(key, value)
  if (typeof value === 'object' && value !== null) {
    if (Array.isArray(value)) state[key] = [...value]
    else state[key] = { ...value }
  } else {
    state[key] = value
  }
  for (const fn of afterSetStateCallbacks) await fn(key, value)
}

export const stateEmpty = () => {
  return !state
}

export const getState = (key) => {
  if (!state) return null
  return state[key]
}