Can we start using it?
netlify.toml:
environment = { AWS_LAMBDA_JS_RUNTIME = "nodejs12.x" }
This should work.
If it doesn’t. Set the AWS_LAMBDA_JS_RUNTIME var in your site setting instead of the toml file.
Let me know how it goes 
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Worked, but I had to add some dummy comment into function file to trigger its reupload.
I don’t know a better way…
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Hi, @web2033, thank you for pointing out that the function’s hash must change to trigger a new deploy and how you achieved this (by adding a comment).