schon/storefront/src/graphql/apolloClient.ts

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

export const apolloClient = new ApolloClient({
    ssrMode: typeof window === 'undefined',
    link: new HttpLink({
        uri: process.env.NEXT_PUBLIC_GRAPHQL_ENDPOINT,
        credentials: 'include',
    }),
    cache: new InMemoryCache({
        typePolicies: {
            Query: {
                fields: {
                    products: {
                        keyArgs: false,
                        merge(existing = { edges: [] }, incoming) {
                            return {
                                ...incoming,
                                edges: [...existing.edges, ...incoming.edges],
                            };
                        },
                    },
                },
            },
        },
    }),
});