better storage management that handles concurrent access

better_storage_manager.ts

const globalKey = 'FORDEFI_data';
const divider = '--';

async function storeComplexData (complexData: Record<string, string[]>) {
  // Flatten the complex object to avoid it being overwritten
  for (const [itemKey, itemValue] of Object.entries(complexData)) {
    const newKey = `${globalKey}${divider}${itemKey}`;
    await chrome.storage.local.set({[newKey]: itemValue});
  }
}

// Get the whole complex structure
async function getComplexData () {
  const storageItems = await chrome.storage.local.get(null);
  const itemKeys = Object.keys(storageItems).filter(
    key => key.startsWith(globalKey)
  );
  const complexData: Record<string, string[]> = {};
  for (const key of itemKeys) {
    const [_, complexDataItemKey] = key.split(divider);
    complexData[complexDataItemKey] = storageItems[key];
  }
  return complexData;
}

// Get the value of a specific key in our complex structure
async function getComplexDataItem (complexDataItemKey: string) {
  const storageItems = await chrome.storage.local.get(null);
  const newKey = `${globalKey}${divider}${complexDataItemKey}`;
  const itemKeys = Object.keys(storageItems).filter(
    key => key === newKey
  );
  if (itemKeys.length === 0) {
    return undefined;
  }
  return storageItems[itemKeys[0]];
}