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Viewing file:     index.js (956 B)      -rwxr-xr-x

export default function createBroadcast (initialState) {
  let listeners = {}
  let id = 0
  let _state = initialState

  const getState = () => _state

  const setState = state => {
    _state = state
    const keys = Object.keys(listeners)
    for (let i = 0; i < keys.length; i += 1) {
      // if a listener gets unsubscribed during setState we just skip it
      if (typeof listeners[keys[i]] !== 'undefined') {
        listeners[keys[i]](state)
      }
    }
  }

  const subscribe = listener => {
    if (typeof listener !== 'function') { throw new Error('listener must be a function.') }
    const currentId = id
    let isSubscribed = true
    listeners[currentId] = listener
    id += 1
    return function unsubscribe () {
      // in case unsubscribe gets called multiple times we simply return
      if (!isSubscribed) return
      isSubscribed = false
      delete listeners[currentId]
    }
  }

  return { getState, setState, subscribe }
}