Nope, I only use what is provided in the standard ruby library. Its nice when you don't have a gem file since it makes bundling much easer for Lambda functions.
I could certainly include RedCarpet. I believe it relies on some native extensions but I could just create a Lambda Layer if that is the case.
I have lambda functions that run queries against my RDS database and that then download data into a json file.
That json file is then read and used to generate out static files. I just pass the data to erb files.
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