Show HN: Funcy – AWS Lambda strongly typed, best practice | Hacker News Reader

Show HN: Funcy – AWS Lambda strongly typed, best practice

github.com

9 pointsbjohnm7 comments

Hi,

Please check out my new library funcy. It's really simplified AWS Lambda APIs in my projects, so I thought I would open-source it.

It strongly-types all request parameters, has support for CORS, content-negotiation, security headers, etc.. out of the box and works via a very simply declarative interface with progressive disclosure.

It's currently pre-release, let me know what you think :)

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Really cool project! I’ve actually been searching for something like this. I’ve experimented with Hono and tRPC to achieve similar results, but it felt like overkill. I prefer to keep my Lambda functions small, with each one serving only a single API endpoint.

Thanks! yeah I also used tRPC for a while, but it's not exactly what I wanted. I wanted a simple way to write REST APIs with Lambda without repeating myself with responsibilities that I don't believe should belong in the function handler code itself.

Is there no equivalent of Amazon.Lambda.APIGatewayEvents as provided for .Net?

You'll notice in those models that body, path, query string, etc. are all strings. There is no validation of data type at runtime, and no strong typing to models at compile/transpile time. This library allows you do redefine the APIGatewayEvents style models so that they are specific to your types, with inbuilt validation.

It also supports a full middleware pipeline under the covers for common concerns.

Ah, that makes sense. Strangely enough, though I use a statically typed language for Lambdas I stopped using in in-built coercion to the type in the handler signatures somewhere along the line. These days I’m almost always skipping the extra dependencies (usually a shared library for the POCOs, and more) and just process the JSON object literally, and produce one as a result. It’s been a good thing I think on my projects; smaller, simpler code.

Any chance this supports smithy?

I'm not familiar with smithy, will take a look.

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