webpack-bootstrap-ui-kit/src/js/_ajax/_apollo.cache.js

import {
  InMemoryCache,
} from '@apollo/client';

//import { IonicStorageModule } from '@ionic/storage';
//import { persistCache, IonicStorageWrapper } from 'apollo3-cache-persist';
import {
  persistCacheSync,
  LocalStorageWrapper,
} from 'apollo3-cache-persist';

const cache = new InMemoryCache();

// await before instantiating ApolloClient, else queries might run before the cache is persisted
//await persistCache({
persistCacheSync({
  cache,
  storage: new LocalStorageWrapper(window.localStorage),
  key: 'web-persist',
  maxSize: 1048576, // 1Mb
  //new IonicStorageWrapper(IonicStorageModule),
});

export {
  cache,
};