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  • import React from "react";
    import { ApolloConsumer, useApolloClient, useQuery, gql } from "@apollo/client";
    
    const GET_MESSAGE_COUNT = gql`
      query GetMessageCount {
        messageCount @client {
          total
        }
      }
    `;
    
    const resolvers = {
      Query: {
        messageCount: (_, args, { cache }) => {
          // ... calculate and return the number of messages in
          // the cache ...
          return {
            total: 123,
            __typename: "MessageCount",
          };
        },
      },
    };
    
    export function MessageCount() {
      const client = useApolloClient();
      client.addResolvers(resolvers);
    
      const { loading, data: { messageCount } } = useQuery(GET_MESSAGE_COUNT);
    
      if (loading) return "Loading ...";
    
      return (
        <p>
          Total number of messages: {messageCount.total}
        </p>
      );
    };
    Docs
  • import { ApolloClient, InMemoryCache, HttpLink, gql } from '@apollo/client';
    
    const query = gql`
      query CurrentAuthorPostCount($authorId: Int!) {
        currentAuthor @client {
          name
          authorId @export(as: "authorId")
        }
        postCount(authorId: $authorId)
      }
    `;
    
    const cache = new InMemoryCache();
    const client = new ApolloClient({
      link: new HttpLink({ uri: 'http://localhost:4000/graphql' }),
      cache,
      resolvers: {},
    });
    
    cache.writeQuery({
      query: gql`
        query GetCurrentAuthor {
          currentAuthor {
            name
            authorId
          }
        }
      `,
      data: {
        currentAuthor: {
          __typename: 'Author',
          name: 'John Smith',
          authorId: 12345,
        },
      },
    });
    
    // ... run the query using client.query, the <Query /> component, etc.
    Docs
  • import { ApolloClient, InMemoryCache } from "@apollo/client";
    
    const client = new ApolloClient({
      cache: new InMemoryCache(),
      uri: "/graphql"
    });
    
    client.query({
      query: MY_QUERY,
      context: {
        // example of setting the headers with context per operation
        headers: {
          special: "Special header value"
        }
      }
    });
    Docs
  • import { ApolloClient, InMemoryCache, HttpLink, gql } from '@apollo/client';
    
    const query = gql`
      query CurrentAuthorPostCount($authorId: Int!) {
        currentAuthorId @client @export(as: "authorId")
        postCount(authorId: $authorId)
      }
    `;
    
    const cache = new InMemoryCache();
    const client = new ApolloClient({
      link: new HttpLink({ uri: 'http://localhost:4000/graphql' }),
      cache,
      resolvers: {},
    });
    
    cache.writeQuery({
      query: gql`query GetCurrentAuthorId { currentAuthorId }`,
      data: {
        currentAuthorId: 12345,
      },
    });
    
    // ... run the query using client.query, the <Query /> component, etc.
    Docs
  • import { ApolloClient, InMemoryCache, HttpLink, gql } from '@apollo/client';
    
    const query = gql`
      query CurrentAuthorPostCount($authorId: Int!) {
        currentAuthorId @client @export(as: "authorId")
        postCount(authorId: $authorId) @client
      }
    `;
    
    const cache = new InMemoryCache();
    const client = new ApolloClient({
      cache,
      resolvers: {
        Query: {
          postCount(_, { authorId }) {
            return authorId === 12345 ? 100 : 0;
          },
        },
      },
    });
    
    cache.writeQuery({
      query: gql`{ currentAuthorId }`,
      data: {
        currentAuthorId: 12345,
      },
    });
    
    // ... run the query using client.query, the <Query /> component, etc.
    Docs
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