扩展存储：local、sync、session 与 managed

{
  "manifest_version": 3,
  "name": "My Extension",
  "version": "1.0.0",
  "permissions": ["storage", "unlimitedStorage"],
  "storage": {
    "managed_schema": "schema.json"
  },
  "background": { "service_worker": "background.js" }
}

const SETTINGS_KEY = "settings";

export async function getSettings() {
  const result = await chrome.storage.local.get(SETTINGS_KEY);
  return result[SETTINGS_KEY] ?? { theme: "system" };
}

export async function setSettings(nextSettings: {
  theme: "system" | "light" | "dark";
}) {
  await chrome.storage.local.set({ [SETTINGS_KEY]: nextSettings });
}

// 在 service worker 中。
chrome.storage.session.setAccessLevel({
  accessLevel: "TRUSTED_AND_UNTRUSTED_CONTEXTS",
});