Amazon has announced support for Node.js 8.10 in AWS Lambda, bringing asynchronous development patterns and Promises to serverless functions, which can help escape "callback hell". This update is also being applied to Netlify Functions by default, allowing developers to use the new handler types with async/await. Existing serverless functions will continue to use an older runtime until they are redeployed, at which time they will adopt the new default runtime of Node.js 8.10, and developers can change their default runtime using environment variables.