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const EventEmitter = require('events').EventEmitter
class ObservableStore extends EventEmitter {
constructor (initialState) {
super()
this._state = initialState
}
get () {
return this._state
}
put (newState) {
this._put(newState)
}
subscribe (handler) {
this.on('update', handler)
}
unsubscribe (handler) {
this.removeListener('update', handler)
}
_put (newState) {
this._state = newState
this.emit('update', newState)
}
}
module.exports = ObservableStore
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