Function watchStorage

src/background/utils/storage-cache.js:152–173

(fn, cfg, state = true)

});

function watchStorage(fn, cfg, state = true) {
  if (state && !valuesToWatch) {
    valuesToWatch = {};
  }
  cfg::forEachEntry(([area, ids]) => {
    const { prefix } = storage[area];
    for (const id of ensureArray(ids)) {
      const key = prefix + id;
      const list = valuesToWatch[key] || state && (valuesToWatch[key] = []);
      const i = list ? list.indexOf(fn) : -1;
      if (i >= 0 && !state) {
        list.splice(i, 1);
        if (!list.length) delete valuesToWatch[key];
      } else if (i < 0 && state) {
        list.push(fn);
      }
    }
  });
  if (isEmpty(valuesToWatch)) {
    valuesToWatch = null;
  }
}

async function updateScriptSizeContributor(key, val) {
  const area = sizesPrefixRe.exec(key);