server.getMiddleware({cors: {}})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

const { ApolloServer, gql } = require('apollo-server');
const { GraphQLScalarType, Kind } = require('graphql');

const typeDefs = gql`
  scalar Date

  type Event {
    id: ID!
    date: Date!
  }

  type Query {
    events: [Event!]
  }
`;

const dateScalar = new GraphQLScalarType({
  // See definition above
});

const resolvers = {  Date: dateScalar  // ...other resolver definitions...};
const server = new ApolloServer({
  typeDefs,
  resolvers
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">ApolloServer</span>
<span class="token keyword">import</span> ApolloServer</code></pre>

const { ApolloServer } = require('apollo-server');

const server = new ApolloServer({
 typeDefs,
 resolvers,
 context: ({ req }) => {
   // Note: This example uses the `req` argument to access headers,
   // but the arguments received by `context` vary by integration.
   // This means they vary for Express, Koa, Lambda, etc.
   //
   // To find out the correct arguments for a specific integration,
   // see https://www.apollographql.com/docs/apollo-server/api/apollo-server/#middleware-specific-context-fields

   // Get the user token from the headers.
   const token = req.headers.authorization || '';

   // Try to retrieve a user with the token
   const user = getUser(token);

   // Add the user to the context
   return { user };
 },
});

server.listen().then(({ url }) => {
 console.log(`🚀 Server ready at ${url}`)
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">ApolloServer</span>
<span class="token keyword">import</span> ApolloServer</code></pre>

const server = new ApolloServer({
  /* ... other necessary configuration ... */

  plugins: [
    {
      async serverWillStart() {
        return {
          schemaDidLoadOrUpdate({ apiSchema, coreSupergraphSdl }) {
            console.log(`The API schema is ${printSchema(apiSchema)}`);
            if (coreSupergraphSdl) {
              console.log(`The core schema is ${coreSupergraphSdl}`);
            }
          },
        };
      },
    },
  ],
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">const</span> server<span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

const { ApolloServer, gql } = require('apollo-server');
const { bootstrap: bootstrapGlobalAgent } = require('global-agent');

// Setup global support for environment variable based proxy configuration.
bootstrapGlobalAgent();

// The following represents existing configuration, though its
// important to bootstrap the agent before Apollo Server.
const server = new ApolloServer({
  typesDefs,
  resolvers,
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">ApolloServer</span>
<span class="token keyword">import</span> ApolloServer</code></pre>

const server = new ApolloServer({
  /* ... other necessary configuration ... */

  plugins: [
    {
      async serverWillStart() {
        console.log('Server starting!');
      }
    }
  ]
})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">const</span> server<span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

const { ApolloServer } = require('apollo-server');

const typeDefs = require('./schema');
const resolvers = require('./resolvers');

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => {
  console.log(`🚀  Server ready at ${url}`);
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">import</span> ApolloServer</code></pre>

const { ApolloServer } = require('apollo-server');

const server = new ApolloServer({
 typeDefs,
 resolvers,
 context: ({ req }) => {
   // Note: This example uses the `req` argument to access headers,
   // but the arguments received by `context` vary by integration.
   // This means they vary for Express, Koa, Lambda, etc.
   //
   // To find out the correct arguments for a specific integration,
   // see https://www.apollographql.com/docs/apollo-server/api/apollo-server/#middleware-specific-context-fields

   // Get the user token from the headers.
   const token = req.headers.authorization || '';

   // Try to retrieve a user with the token
   const user = getUser(token);

   // Add the user to the context
   return { user };
 },
});

server.listen().then(({ url }) => {
 console.log(`🚀 Server ready at ${url}`)
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">ApolloServer</span>
<span class="token keyword">import</span> ApolloServer</code></pre>

(async () => {
  
  //...
const server = new ApolloServer({
    schema,
    executor,
    context: ({ req }) => {
      return {
        Authorization: req.headers.authorization || null
      };
    }
  });

  server.listen().then(({ url }) => {
    console.log(`🚀 Server ready at ${url}`);
  });
})()
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">const</span> server<span class="token operator">:</span> ApolloServer</code></pre>

//...
const { ApolloServer } = require("apollo-server");
const { typeDefs } = require("./typeDefs");
const { resolvers } = require("./resolvers");

const server = new ApolloServer({
  typeDefs,
  resolvers,
  introspection: true,
  playground: true,
});

server.listen({ port: process.env.PORT || 4000 }).then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">ApolloServer</span>
<span class="token keyword">import</span> ApolloServer</code></pre>

//...
// Pass the ApolloGateway to the ApolloServer constructor
const server = new ApolloServer({
  gateway,

  // Disable subscriptions (not currently supported with ApolloGateway)
  subscriptions: false,
});

server.listen(8082).then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">const</span> server<span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

server.createHandler({cors})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

server.createHandler({expressGetMiddlewareOptions: {cors: false}})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

server.createHandler({expressGetMiddlewareOptions: {cors}})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

server.createHandler({cors: false})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

server.createHandler({onHealthCheck})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>

module.exports = {
    Mutation: {
        async login(_, { username, password }) {
            const { errors, valid } = validateLoginInput(username, password);

            if (!valid) {
                throw new UserInputError("Validation error", { errors });
            }

            const user = await User.findOne({ username });

            

            //...
},
        
        //...
,
    },
}
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">module</span> <span class="token keyword">export</span><span class="token operator">=</span>
<span class="token punctuation">(</span>property<span class="token punctuation">)</span> <span class="token keyword">export</span><span class="token operator">=</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    Mutation<span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token function">login</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> username<span class="token punctuation">,</span> password <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            username<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
            password<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token operator">></span><span class="token punctuation">;</span>
        <span class="token function">register</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> registerInput<span class="token operator">:</span> <span class="token punctuation">{</span> username<span class="token punctuation">,</span> email<span class="token punctuation">,</span> password<span class="token punctuation">,</span> confirmPassword <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            registerInput<span class="token operator">:</span> <span class="token punctuation">{</span>
                username<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                email<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                password<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                confirmPassword<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token operator">...</span><span class="token operator">></span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>

module.exports = {
  
  //...
,
  Mutation: {
    
    //...
,
    async likePost(_, { postId }, context) {
      
      //...
if (post) {
        
        //...
await post.save();
        return post;
      } else throw new UserInputError('Post not found');
    }
  },
  
  //...
}
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">module</span> <span class="token keyword">export</span><span class="token operator">=</span>
<span class="token punctuation">(</span>property<span class="token punctuation">)</span> <span class="token keyword">export</span><span class="token operator">=</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    Query<span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token function">getPosts</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token operator">></span><span class="token punctuation">;</span>
        <span class="token function">getPost</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> postId <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            postId<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token operator">></span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
    Mutation<span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token function">createPost</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> body <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            body<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> context<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span>Document<span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token builtin">any</span><span class="token operator">>></span><span class="token punctuation">;</span>
        <span class="token function">deletePost</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> postId <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token operator">...</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> context<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token operator">...</span><span class="token operator">></span><span class="token punctuation">;</span>
        <span class="token function">likePost</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> postId <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token operator">...</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> context<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token operator">...</span><span class="token operator">></span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
    Subscription<span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token operator">...</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>

async getData({
    esIndex, esType, fields, filter, sort, offset, size,
  }) {
    if (typeof size !== 'undefined' && offset + size > SCROLL_PAGE_SIZE) {
      throw new UserInputError(`Large graphql query forbidden for offset + size > ${SCROLL_PAGE_SIZE},
      offset = ${offset} and size = ${size},
      please use download endpoint for large data queries instead.`);
    }
    
    //...
}

  
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>method<span class="token punctuation">)</span> <span class="token constant">ES</span><span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">{</span> esIndex<span class="token punctuation">,</span> esType<span class="token punctuation">,</span> fields<span class="token punctuation">,</span> filter<span class="token punctuation">,</span> sort<span class="token punctuation">,</span> offset<span class="token punctuation">,</span> size<span class="token punctuation">,</span> <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    esIndex<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    esType<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    fields<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    filter<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    sort<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    offset<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
    size<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token operator">></span></code></pre>

module.exports = new graphql.GraphQLScalarType({
  
  //...
,

  parseLiteral(ast) {
    if (typeof ast.value !== 'string') {
      throw new UserInputError('Cursor should be a string.');
    }

    

    //...
},
})
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">module</span> <span class="token keyword">export</span><span class="token operator">=</span>
<span class="token punctuation">(</span>property<span class="token punctuation">)</span> <span class="token keyword">export</span><span class="token operator">=</span><span class="token operator">:</span> graphql<span class="token punctuation">.</span>GraphQLScalarType</code></pre>

module.exports = {
  Mutation: {
    async login(_, { username, password }) {
      const { errors, valid } = validateLoginInput(username, password);

      if (!valid) {
        throw new UserInputError('Errors', { errors });
      }

      const user = await User.findOne({ username });

      

      //...
},
    
    //...
}
}
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">module</span> <span class="token keyword">export</span><span class="token operator">=</span>
<span class="token punctuation">(</span>property<span class="token punctuation">)</span> <span class="token keyword">export</span><span class="token operator">=</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    Mutation<span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token function">login</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> username<span class="token punctuation">,</span> password <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            username<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
            password<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token builtin">any</span><span class="token operator">></span><span class="token punctuation">;</span>
        <span class="token function">register</span><span class="token punctuation">(</span>_<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> registerInput<span class="token operator">:</span> <span class="token punctuation">{</span> username<span class="token punctuation">,</span> email<span class="token punctuation">,</span> password<span class="token punctuation">,</span> confirmPassword <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            registerInput<span class="token operator">:</span> <span class="token punctuation">{</span>
                username<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                email<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                password<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
                confirmPassword<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">Promise</span><span class="token operator">&lt;</span><span class="token operator">...</span><span class="token operator">></span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>