export interface StorageChange {
  oldValue?: string | null
  newValue?: string | null
}

export type StorageChangeListener = (changes: { [key: string]: StorageChange }) => void

export interface StorageChangeEvent {
  addListener(listener: StorageChangeListener): void
  removeListener(listener: StorageChangeListener): void
  hasListener(listener: StorageChangeListener): boolean
}

export interface Storage {
  get: (keys: string | string[]) => { [key: string]: string }
  set: (items: { [key: string]: string }) => void
  remove: (keys: string | string[]) => void
  onChanged: StorageChangeEvent
}

export interface AsyncStorage {
  get: (keys: string | string[]) => Promise<{ [key: string]: string }>
  set: (items: { [key: string]: string }) => Promise<void>
  remove: (keys: string | string[]) => Promise<void>
  onChanged: StorageChangeEvent
}