Apollo Client service example.

apollo_service.js

import { ApolloClient } from "apollo-client";
import { ApolloLink } from "apollo-link";
import { HttpLink } from "apollo-link-http";
import { onError } from "apollo-link-error";

import { InMemoryCache } from "apollo-cache-inmemory";
import { getToken } from "./token";

import * as Toast from "./notification";

const httpLink = new HttpLink({
    uri: process.env.REACT_APP_API_URL,
    headers: {
        authorization: getToken()
    }
});

const errorLink = onError(({ graphQLErrors, networkError }) => {
    if (graphQLErrors) {
        // do something with graphql error
        for (let x = 0; x < graphQLErrors.length; x++) {
            let err = graphQLErrors[x];
            console.log(">>>>> err", err);
            switch (err.message) {
            case "not-found":
                Toast.showError(
                    "Usuário não encontrado. Verifique e tente novamente."
                );
                break;
            default:
            }
        }
        console.log("graphQLErrors =====> ", graphQLErrors);
    }

    if (networkError) {
        // do something with network error
        console.log("networkError =====> ", networkError);
    }
});

const link = ApolloLink.from([errorLink, httpLink]);

const client = new ApolloClient({
    link,
    cache: new InMemoryCache()
});

export default client;