swarpc/src/localstorage.ts

Full type-safe RPC library for service worker -- move things off of the UI thread with ease!

export class FauxLocalStorage {
  data: Record<string, any>;
  keysOrder: string[];

  constructor(data: Record<string, any>) {
    this.data = data;
    this.keysOrder = Object.keys(data);
  }

  setItem(key: string, value: string) {
    if (!this.hasItem(key)) this.keysOrder.push(key);
    this.data[key] = value;
  }

  getItem(key: string) {
    return this.data[key];
  }

  hasItem(key: string) {
    return Object.hasOwn(this.data, key);
  }

  removeItem(key: string) {
    if (!this.hasItem(key)) return;
    delete this.data[key];
    this.keysOrder = this.keysOrder.filter((k) => k !== key);
  }

  clear() {
    this.data = {};
    this.keysOrder = [];
  }

  key(index: number) {
    return this.keysOrder[index];
  }

  get length() {
    return this.keysOrder.length;
  }

  register(subject: WorkerGlobalScope | SharedWorkerGlobalScope) {
    // @ts-expect-error
    subject.localStorage = this;
  }
}