apollo-cache-shoebox.ts

import ApplicationInstance from '@ember/application/instance';

export function initialize(appInstance: ApplicationInstance): void {
  const fastboot = appInstance.lookup('service:fastboot');
  const apolloCache = appInstance.lookup('service:apollo').client.cache;
  const shoebox = fastboot.get('shoebox');

  if (fastboot.get('isFastBoot')) {
    shoebox.put('apollo-cache', {
      get cache(): unknown {
        return apolloCache.extract();
      }
    });
  } else {
    const cacheContents = shoebox.retrieve('apollo-cache');
    if (cacheContents && cacheContents.cache) {
      apolloCache.restore(cacheContents.cache);
    }
  }
}

export default {
  name: 'apollo-cache-shoebox',
  initialize
};