Fix broken fix #450 - Creating a serverless application using the AWS CDK

[Hustenbonbon]

As my comment in closed issue #450 stated, the fix from #451 is broken.
I'm going to provide a hotfix in a minute as a PR.

[markusl]

Hi @Hustenbonbon. Please check the updated documentation at https://docs.aws.amazon.com/cdk/v2/guide/serverless_example.html and let us know if there are any other improvements needed. The examples are now using AWS JS SDK v3 and the latest version of AWS Lambda runtimes.

[Hustenbonbon]

Hi, thanks for reaching out.
I currently get this error after the first part:

{
    "errorType": "Runtime.ImportModuleError",
    "errorMessage": "Error: Cannot find module 'widgets'\nRequire stack:\n- /var/runtime/index.mjs",
    "stack": [
        "Runtime.ImportModuleError: Error: Cannot find module 'widgets'",
        "Require stack:",
        "- /var/runtime/index.mjs",
        "    at _loadUserApp (file:///var/runtime/index.mjs:997:17)",
        "    at async UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:1032:21)",
        "    at async start (file:///var/runtime/index.mjs:1195:23)",
        "    at async file:///var/runtime/index.mjs:1201:1"
    ]
}

I couldn't find a fix immediately, do you want me to check further and make a PR?

[Hustenbonbon]

If you want to use import syntax in the lambda code, using lambda.NodeJsFunction might be the way to go instead of using lambda.Function