AWS Lambda plans to remove support for callback-based function handlers

Motivation

Ref: https://github.com/aws/aws-lambda-nodejs-runtime-interface-client/issues/137

Callback handler syntax is being deprecated for the new Node 24 Lambda runtime and should be replaced with the async syntax.

I didn't see any open issues or PRs related to this, apologies if this is duplicative or if there is already an option to change this behavior under the hood. Otherwise, if nobody else is working on this I can give it a shot.

Example

exports.handler = (event, context, callback) => {
  // ... handler logic
  callback(null, { statusCode: 200, body: 'Success!' });
};

to:

export const handler = async (event, context) => {
  // ... handler logic
  return { statusCode: 200, body: 'Success!' };
};

该 issue 未指出源文件、测试或入口点。首先定位 Lambda handler 在哪里被调用，以及如何检测或支持 callback 风格的 handler，然后检查 Node 24 runtime 的预期。完成的标准是，相关的 handler 路径使用 async 返回值而不依赖 callback 语法，并且覆盖文档中的示例。