defineFunction only has entry property to provide code

[juan-psl]

Environment information

System:
  OS: macOS 15.2
  CPU: (8) arm64 Apple M2
  Memory: 149.80 MB / 16.00 GB
  Shell: /bin/zsh
Binaries:
  Node: 18.18.0 - ~/.nvm/versions/node/v18.18.0/bin/node
  Yarn: 1.22.22 - ~/.nvm/versions/node/v18.18.0/bin/yarn
  npm: 9.8.1 - ~/.nvm/versions/node/v18.18.0/bin/npm
  pnpm: undefined - undefined
NPM Packages:
  @aws-amplify/auth-construct: 1.5.1
  @aws-amplify/backend: 1.9.0
  @aws-amplify/backend-auth: 1.4.2
  @aws-amplify/backend-cli: 1.4.3
  @aws-amplify/backend-data: 1.2.2
  @aws-amplify/backend-deployer: 1.1.11
  @aws-amplify/backend-function: 1.9.0
  @aws-amplify/backend-output-schemas: 1.4.0
  @aws-amplify/backend-output-storage: 1.1.4
  @aws-amplify/backend-secret: 1.1.5
  @aws-amplify/backend-storage: 1.2.4
  @aws-amplify/cli-core: 1.2.1
  @aws-amplify/client-config: 1.5.3
  @aws-amplify/deployed-backend-client: 1.4.2
  @aws-amplify/form-generator: 1.0.3
  @aws-amplify/model-generator: 1.0.9
  @aws-amplify/platform-core: 1.3.0
  @aws-amplify/plugin-types: 1.6.0
  @aws-amplify/sandbox: 1.2.7
  @aws-amplify/schema-generator: 1.2.6
  aws-amplify: 6.10.3
  aws-cdk: 2.172.0
  aws-cdk-lib: 2.172.0
  typescript: 5.7.2
No AWS environment variables
No CDK environment variables

Describe the feature

Add a way to specify the folder that contains the handler.ts, instead of the path to the handler.ts, so when bundling the lambda it packages all the contents of the container folder

Or add a new property where we can pass a list of extra files to include when packaging the lambda.

Use case

I want to use handlebars in a lambda, so I need to bundle a template.hbs file along with the code.

The defineFunction has an entry property which is The path to the file that contains the function entry point.

My project structure looks like this :

amplify/
    my-lambda/
        handler.ts
        resource.ts
        template.hbs

when I build the lambda, if I download the code, the code only contains:

index.mjs
index.mjs.map

the template.hbs file is not there

If I use the cdk like this:

import * as lambda from "aws-cdk-lib/aws-lambda";
import { Runtime } from "aws-cdk-lib/aws-lambda";
const emailHandler = new lambda.Function(customResourceStack, "EmailHandler", {
  runtime: Runtime.NODEJS_20_X,
  code: lambda.Code.fromAsset("./amplify/my-lambda"),
  handler: "handler.handler",
});

it adds all of my code inlcuding the template.hbs

would there be a way do the same with the defineFunction?, I don't wanna rely on the new lambda.Function because then I wouldn't be able to provide the secret() in the env configuration