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(Warning: I am being Dennis Downer) Meanwhile, we're still waiting on WebSockets and it's been nearly 10 years.
Everyone should read the PR https://github.com/nodejs/node/pull/48890. It doesn't traverse parent directories, it doesn't have good overwrite/merge logic, multiline support, or variable expansion - things that dotenv has supported for years (sometimes with add-ons). This is another half-useful implementation that the majority will end up ignoring, and keep using better-suited third party packages for.
Node is committee'd to death, and the comments in that PR are further proof. I've been in the Node ecosystem since 2010, and my money is on Bun and Deno to lead the way forward.
https://www.npmjs.com/package/dotenv is the gold standard imho. they have a few other packages you can add-on that expand its functionality. I have a custom package which utilizes dotenv, dotenv-expand, and find-up for a truly delightful DX.
Note that there is no .env file format standard and different tools (Node, Docker, etc) have different formats.
Shdotenv helps to convert/reuse environment files across tools
https://github.com/ko1nksm/shdotenv
Check out keycmd[1], you might appreciate the ideas there. Disclaimer: it's my project.
[1] https://github.com/ClinicalGraphics/keycmd
Especially considering the GitHub .gitignore template for Node only ignores .env.local, not .local.env: https://github.com/github/gitignore/blob/main/Node.gitignore...