(aws-cloudfront): Support bundling code for CloudFront Functions

[SydneyUni-Jim]

Describe the feature

Support running the code for CloudFront Functions (not Lambda@Edge) through esbuild and/or tsc.

Use Case

• Bundle in modules, particularly polyfills
• Minify and treeshake to help keep within the default 10k limit for CloudFront Functions
• Removing comments
• Transpile down to the limited JavaScript supported for CloudFront Functions
• Type checking to detect errors early
• Assist with converting Lambda@Edge functions to cheaper CloudFront Functions

Proposed Solution

• Add AssetCode and AssetCodeOptions to packages/aws-cdk-lib/aws-cloudfront/lib/function.ts.
• AssetCode provides a render method that emits the output from running the function code through esbuild and/or tsc. Perhaps reusing the mechanism aws_lambda_nodejs.AssetCode uses.
• Add the static method FunctionCode.fromAsset(path, options) to construct AssetCode, paralleling aws_lambda_nodejs.Code.fromAsset(path, options)
• Provide two pre-configured bundling options: one that targets JavaScript Function runtime 1.0 and one that targets runtime 2.0

Other Information

No response

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

CDK version used

2.144.0

Environment details (OS name and version, etc.)

NodeJS/iron

[pahud]

I guess it's related to https://github.com/aws/aws-cdk/issues/12671 ?

[SydneyUni-Jim]

It's not related to #12671, at least not directly. That's about Lambda@Edge. This is about CloudFront Functions, two different things.

ref: https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/edge-functions.html