NODE_ENV is undefined in lambda functions no matter what I do

[fool]

Jon has as usual done an incredible job of providing a very similar answer to the one Netlify’s staff would have. The “missing piece” is one we’re working on writing up right now - TL;DR we only automatically “forward” environment variables from our UI, NOT from netlify.toml (nor automatically set like “$COMMIT_REF”), to functions. The plugin Jon linked is a good way to get there, or you can manually interpolate the variables as explained in this article:

[Support Guide] Using environment variables on Netlify correctly

Last reviewed: August 2023 The preferred way to use environment variables in Netlify is to set them in our environment - be that in the Environment Variables settings UI (on the site’s “Build & Deploy settings” page), or via netlify.toml. You’ll want to choose the right pattern to meet your needs. Setting variables in our UI may be considered a bit more secure, since only people with access to the Netlify admin UI for your site can see them, rather than “anyone who can clone your repo!”. Thes…