zeichen-legacy/packages/app/src/services/LocalStorage.ts

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

  getItem(id: string, fallback: T = null) {
    const raw = this.source.getItem(id)
    if (raw === null) {
      return fallback
    }
    return this.deserializer(raw)
  }

  setItem(id: string, item: T) {
    this.source.setItem(id, this.serializer(item))
  }

  removeItem(id: string) {
    this.source.removeItem(id)
  }
}