export default interface Storage<T> {
  queryItems(): Promise<T[]>
  saveItem(item: T): Promise<void>
  deleteItem(item: T): Promise<boolean>
}

export interface Collection<T> {
  items: T[],
  lastModifiedBy: string,
  lastModifiedAt: Date,
}

export type Serializer<T = unknown> = (t: T) => string
export type Deserializer<T = unknown> = (s: string) => T

export class OutOfSyncError {}