zeichen-plugin-local-storage/src/Engine.ts

export default class LocalStorage<T> {
  constructor(
    private readonly source: Storage,
    private readonly serializer: (t: T) => string = JSON.stringify,
    private readonly deserializer: (s: string) => T = JSON.parse,
  ) {}

  getCollection(collectionId: string) {
    const raw = this.source.getItem(collectionId)
    if (raw !== null) {
      return this.deserializer(raw)
    }
    return null
  }

  replaceCollection(collectionId: string, collectionData: T) {
    this.source.setItem(collectionId, this.serializer(collectionData))
  }

  removeCollection(collectionId: string) {
    this.source.removeItem(collectionId)
  }
}