How to use the file-system-cache function in file-system-cache

import findCacheDir from 'find-cache-dir';
import open from 'open';
import boxen from 'boxen';
import semver from 'semver';
import dedent from 'ts-dedent';
import Table from 'cli-table3';
import prettyTime from 'pretty-hrtime';
import inquirer from 'inquirer';
import detectFreePort from 'detect-port';

import storybook from './dev-server';
import { getDevCli } from './cli';

const defaultFavIcon = require.resolve('./public/favicon.ico');
const cacheDir = findCacheDir({ name: 'storybook' });
const cache = Cache({
  basePath: cacheDir,
  ns: 'storybook', // Optional. A grouping namespace for items.
});

const writeStats = async (name, stats) => {
  await fs.writeFile(
    path.join(cacheDir, `${name}-stats.json`),
    JSON.stringify(stats.toJson(), null, 2),
    'utf8'
  );
};

const getFreePort = port =>
  detectFreePort(port).catch(error => {
    logger.error(error);
    process.exit(-1);

export async function cachedStorybookMetadata() {
  const cacheDir = findCacheDir({ name: 'storybook' });
  const cache = Cache({
    basePath: cacheDir,
    ns: 'storybook', // Optional. A grouping namespace for items.
  });

  const packagePath = await findUp('package.json');
  if (!packagePath) {
    throw new Error('No package.json');
  }
  const packageJson = JSON.parse(await fs.readFile(packagePath, 'utf-8'));
  const metadataCache = await cache.get('storybookMetadata', {});
  const storybookMetadata = await loadStorybookMetadata(packageJson, {
    cache: metadataCache,
    getPackageJson: async packageName => {
      const packageFile = require.resolve(`${packageName}/package.json`);
      return JSON.parse(await fs.readFile(packageFile, 'utf8'));
    },