monstermash.ts

import { tryJsonParse } from "./tryJsonParse";

// Small wrapper around localStorage that converts to/from json.
//
// We also define all localStorage keys/values we store upfront here.
// This way all values are documented, and we get type saftey.
//
interface LocalStored {
  device_info: string;
  debugRedirects: boolean;
}

type LocalStoredKey = keyof LocalStored;

export function getItem<T extends LocalStoredKey>(key: T): LocalStored[T] | undefined {
  const valueJson = window.localStorage.getItem(key)
  if (valueJson) {
    return tryJsonParse(valueJson)
  } else {
    return undefined
  }
}

export function setItem<T>(key: LocalStoredKey, value: T) {
  const valueJson = JSON.stringify(value)
  window.localStorage.setItem(key, valueJson)
}