lareCacheableTask = function ({ getCacheKey, task }) {
  const cache = new TaskCache();

  return function (...args) {
    return async function ({ dispatch, getState }) {
      const key = getCacheKey(...args);

      const extantResult = cache.get(key);
      if (extantResult) {
        return extantResult;
      }

      // Ensure that we have our new entry in the cache *before* dispatching the
      // task!
      let resolve;
      cache.put(
        key,
        new Promise(r => {
          resolve = r;
        })
      );

      resolve(
        dispatch(async function () {
          try {
            args.push(() => cache.remove(key), dispatch, getState);
            return await task(...args);
          } catch (error) {
            // Don't perma-cache errors.
            if (cache.get(key)) {
              cache.remove(key);
            }
            throw error;
          }
        })
      );

      return cache.get(key);
    };
  };
};
PK