// Create your store
const store = require('ha-store');
const itemStore = store({
  resolver: getItems,
  uniqueParams: ['language']
});

// Define your resolver
function getItem(ids, params, contexts) {
  // Ids will be a list of all the unique requested items
  // Params will be the parameters for the request, which must be declared in the `uniqueParams` config of the store
  // Contexts will be the list of originating context information

  // Now perform some exensive network call or database lookup...

  // Then, respond with your data formatted into one of these two formats:
    // a) [ { id: '123', language: 'fr', name: 'fred' } ]
    // b) { '123': { language: 'fr', name: 'fred' } }
}

// Now to use your store
itemStore.get('123', { language: 'fr' }, { some: 'context' })
  .then(item => /* The item you requested */);

// You can even ask for more than one item at a time
itemStore.get(['123', '456'], { language: 'en' }, { another: 'context' })
  .then(items => /* All the items you requested */);