src/settings/storage.ts


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import SettingData, { DefaultSettingData } from '../shared/SettingData';

const loadSettingData = async(): Promise<SettingData> => {
  const { settings: syncSettings } = await browser.storage.sync.get('settings');
  if (syncSettings) {
    return SettingData.fromJSON(syncSettings as any);
  }
  const { settings: localSettings } = await browser.storage.local.get('settings');
  if (localSettings) {
    return SettingData.fromJSON(localSettings as any);
  }
  return DefaultSettingData
};

export const load = async(): Promise<SettingData> => {
  try {
    return loadSettingData();
  } catch (e) {
    console.error('unable to load settings', e);
    return DefaultSettingData;
  }
};

export const save = async (data: SettingData) => {
  await browser.storage.local.set({
    settings: data.toJSON(),
  });
  return browser.storage.sync.set({
    settings: data.toJSON(),
  });
};