errorType": "Runtime.HandlerNotFound", "errorMessage": "index.handler is undefined or not exported", - Forums
javascript - module.exports vs exports in Node.js - Stack Overflow
javascript - module.exports is returning undefined - Stack Overflow
Everything you should know about 'module' & 'require' in Node.js
Jagruti Metaliya on Twitter: "3. Default exports - Each module can optionally export a default export. Default exports are marked with the keyword default; and there can only be one default export
Understanding Modules and Import and Export Statements in JavaScript | DigitalOcean
Class extends value undefined is not a constructor or null · Issue #73 · stoplightio/json-schema-viewer · GitHub
Differences with Default and Named Exports - ES6 JavaScript - YouTube