title: graphqlHTTP is not a function
body: <p>Here is my simple graphql express app</p>
  <pre><code>const express = require('express');
  const graphqlHTTP = require('express-graphql');
  
  const app = express();
  app.use(
      '/graphql',
      graphqlHTTP({
        graphiql: true,
      })
    );
  
  app.listen(4000, () =&gt; {
      console.log(&quot;listening for request!&quot;);
  });
  </code></pre>
  <p>I'm getting the following errors when I run it:</p>
  <pre><code> graphqlHTTP({
      ^
  
  TypeError: graphqlHTTP is not a function
      at Object.&lt;anonymous&gt; (D:\PersonalProjects\GraphQL\server\app.js:7:5)
      at Module._compile (internal/modules/cjs/loader.js:1138:30)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
      at Module.load (internal/modules/cjs/loader.js:986:32)
      at Function.Module._load (internal/modules/cjs/loader.js:879:14)
      at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)  
      at internal/main/run_main_module.js:17:47
  </code></pre>
  <p>How can I fix it? Thanks in advance!</p>