title: Receiving TypeError: AWS.RDSDataService is not a constructor
body: <p>Attempting to use the RDSDataService in AWS Lambda as follows:</p>
  
  <pre><code>const AWS = require('aws-sdk');
  
  AWS.config.update({
    region: 'us-east-1'
  })
  AWS.config.apiVersions = {
    rdsdataservice: '2018-08-01',
    // other service API versions
  };
  
  const rdsdataservice = new AWS.RDSDataService();
  
  exports.handler = function(event, context, callback) {
    callback(null, 'ok')      
  };
  </code></pre>
  
  <p>And receiving error: </p>
  
  <blockquote>
    <p>"errorMessage": "AWS.RDSDataService is not a constructor",
     "errorType": "TypeError",
     "stackTrace": [
       "Module._compile (module.js:652:30)",
       "Object.Module._extensions..js (module.js:663:10)",
       "Module.load (module.js:565:32)",
       "tryModuleLoad (module.js:505:12)",
       "Function.Module._load (module.js:497:3)",
       "Module.require (module.js:596:17)",
       "require (internal/module.js:11:18)"</p>
  </blockquote>
  
  <p>Nodejs version: 8.10</p>
  
  <p>Any idea what's going on? I've set region and API version</p>