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import { useMemo } from "react";
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client";
import { SchemaLink } from "@apollo/client/link/schema";
import { schema } from "../apollo/schema";
import merge from "deepmerge";
let apolloClient;
function createIsomorphLink() {
if (typeof window === "undefined") {
return new SchemaLink({ schema });
} else {
return new HttpLink({
uri: "/api/graphql",
credentials: "same-origin",
});
}
}
function createApolloClient() {
return new ApolloClient({
ssrMode: typeof window === "undefined",
link: createIsomorphLink(),
cache: new InMemoryCache(),
});
}
export function initializeApollo(initialState = null) {
const _apolloClient = apolloClient ?? createApolloClient();
// If your page has Next.js data fetching methods that use Apollo Client, the initial state
// gets hydrated here
if (initialState) {
// Get existing cache, loaded during client side data fetching
const existingCache = _apolloClient.extract();
// Merge the existing cache into data passed from getStaticProps/getServerSideProps
const data = merge(initialState, existingCache);
// Restore the cache with the merged data
_apolloClient.cache.restore(data);
}
// For SSG and SSR always create a new Apollo Client
if (typeof window === "undefined") return _apolloClient;
// Create the Apollo Client once in the client
if (!apolloClient) apolloClient = _apolloClient;
return _apolloClient;
}
export function useApollo(initialState) {
const store = useMemo(() => initializeApollo(initialState), [initialState]);
return store;
}
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