Added graphql

src/lib/graphql/apollo.ts

@@ -0,0 +1,59 @@
+import { IncomingMessage, ServerResponse } from 'http'
+import { useMemo } from 'react'
+import {
+  ApolloClient,
+  InMemoryCache,
+  NormalizedCacheObject,
+} from '@apollo/client'
+
+let apolloClient: ApolloClient<NormalizedCacheObject> | undefined
+
+export type ResolverContext = {
+  req?: IncomingMessage
+  res?: ServerResponse
+}
+
+function createIsomorphLink(_: ResolverContext = {}) {
+  if (typeof window === 'undefined') {
+  } else {
+    const { HttpLink } = require('@apollo/client')
+    return new HttpLink({
+      uri: 'http://127.0.0.1:3001/',
+      credentials: 'same-origin',
+    })
+  }
+}
+
+function createApolloClient(context?: ResolverContext) {
+  return new ApolloClient({
+    ssrMode: typeof window === 'undefined',
+    link: createIsomorphLink(context),
+    cache: new InMemoryCache(),
+  })
+}
+
+export function initializeApollo(
+  initialState: any = null,
+  // Pages with Next.js data fetching methods, like `getStaticProps`, can send
+  // a custom context which will be used by `SchemaLink` to server render pages
+  context?: ResolverContext
+) {
+  const _apolloClient = apolloClient ?? createApolloClient(context)
+
+  // If your page has Next.js data fetching methods that use Apollo Client, the initial state
+  // get hydrated here
+  if (initialState) {
+    _apolloClient.cache.restore(initialState)
+  }
+  // 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: any) {
+  const store = useMemo(() => initializeApollo(initialState), [initialState])
+  return store
+}