Nodejs ES6 import issue with AWS Lambda & Layer

Question

I'm using NodeJs(ES6) on AWS Lambda with node_module as AWS Layer and I want to publish a message on SNS.

The above code works perfectly with CommonJs syntax but using import syntax (ES6) facing an issue with aws-sdk/sns-client as this is commonsJS module.

Package.json

{
  "name": "test",
  "version": "1.0.0",
  "dependencies": {
    "@aws-sdk/client-sns": "^3.370.0",
  },
  "type": "module",
}

• My code same as mentioned in AWS Documentation.
• Node Modules added into nodejs directory and zipped it as a layer.
• ../lib/snsClient.js created as mentioned in the documentation.
• Tried with nodejs16.x, nodejs18.x and nodejs.20.x and mjs extension.
• Want to use ES6 due to some dependencies.

ERROR

2024-05-05T20:50:31.064Z    undefined   ERROR   Uncaught Exception  
{
    "errorType": "Runtime.UserCodeSyntaxError",
    "errorMessage": "SyntaxError: Named export 'AWS' not found. The requested module 'aws-sdk' is a CommonJS module, which may not support all module.exports as named exports.\nCommonJS modules can always be imported via the default export, for example using:\n\nimport pkg from 'aws-sdk';\nconst { AWS } = pkg;\n",
    "stack": [
        "Runtime.UserCodeSyntaxError: SyntaxError: Named export 'AWS' not found. The requested module 'aws-sdk' is a CommonJS module, which may not support all module.exports as named exports.",
        "CommonJS modules can always be imported via the default export, for example using:",
        "",
        "import pkg from 'aws-sdk';",
        "const { AWS } = pkg;",
        "",
        "    at _loadUserApp (file:///var/runtime/index.mjs:1084:17)",
        "    at async UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:1119:21)",
        "    at async start (file:///var/runtime/index.mjs:1282:23)",
        "    at async file:///var/runtime/index.mjs:1288:1"
    ]
}

Tried following as well,

import pkg from 'aws-sdk'; 
const { AWS } = pkg;

Thank you in advance.

Answer 1

You are currently including the v3 version of SNS:

"dependencies": {
  "@aws-sdk/client-sns": "^3.370.0",
},

But you are using as if it were a v2 package:

import pkg from 'aws-sdk'; 
const { AWS } = pkg;

So either you need to include the v2 version of aws-sdk (not a good idea)
or you need to use it like it is a v3 package:

import { SNSClient } from "@aws-sdk/client-sns";
...
const client = new SNSClient({});

You can see examples for v3 here: https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/javascript_sns_code_examples.html

Edit:

Here is some instructions for upgrading code to v3: https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/migrating.html

If you want AWS to do it you can do this:

npx aws-sdk-js-codemod -t v2-to-v3 .