Serverless-express: ​​"listener" argument must be a function​​

[mattdell]

When I call awsServerlessExpress.createServer with my exported express app as the first parameter I get the error

​​"listener" argument must be a function​​
  at ​​​_addListener​​​ ​events.js:216​
  at ​​​Server.addListener​​​ ​events.js:270​
  at ​​​new Server​​​ ​_http_server.js:231​
  at ​​​Object.exports.createServer​​​ ​http.js:44​
  at ​​​Object.exports.createServer​​​ ​./node_modules/aws-serverless-express/index.js:134​

Listener appears to be the first parameter in the createServer function. I don't understand how listener could be a function if it's my express app.

My full code reads:

const awsServerlessExpress = require('aws-serverless-express');
const app = require('./dist/server');
const server = awsServerlessExpress.createServer(app);

exports.handler = (event, context) => awsServerlessExpress.proxy(server, event, context);

Any ideas?

[mattdell]

Ah... classic ES6 export with an ES5 import.

Fixed with const app = require('./dist/server').default;