Not working on serverless edge functions

[MickL]

Seems like nodemailer is not working on edge functions like Cloudflare Workers, Vercel Edge Functions or Deno Deploy.

On Vercel I dont see a very detailed error:

TypeError: Class extends value #<Object> is not a constructor or null
    at (index.mjs:1:370367)
    at (__nitro:middleware.js:1:17)

Probably this is due to Node api being used like 'fs' that does not exist within edge worker functions.

As a workaround instead of nodemailer an external service like resend.com could be used: https://github.com/resend/resend-cloudflare-workers-example/blob/main/worker.js

Related: #1621 #1563

[naeem-qv]

Seems like nodemailer is not working on edge functions like Cloudflare Workers, Vercel Edge Functions or Deno Deploy.

On Vercel I dont see a very detailed error:

TypeError: Class extends value #<Object> is not a constructor or null
    at (index.mjs:1:370367)
    at (__nitro:middleware.js:1:17)

Probably this is due to Node api being used like 'fs' that does not exist within edge worker functions.

As a workaround instead of nodemailer an external service like resend.com could be used: https://github.com/resend/resend-cloudflare-workers-example/blob/main/worker.js

Related: #1621 #1563

So we can't use nodemailer with nextjs?

[MickL]

Sure you can use it as long as you dont deploy on Edge Workers

[andris9]

Nodemailer does not work in any kind of Workers, only in "real" node.js.

[MickL]

This is exactly the point of this issue

[andris9]

The runtime for workers is not Node.js, it is more similar to a front-end runtime. That runtime lacks support for raw TCP and TLS APIs required by Nodemailer and as such Nodemailer will never work on it.

[tcurdt]

For example the Cloudflare runtime certainly has limitations.

What works is using the APIs (SES, SendGrid, Mailchannels) directly.
I also looked for some abstraction for these APIs. But nodemailer just ain't that.

[sheecegardezi]

The runtime for workers is not Node.js, it is more similar to a front-end runtime. That runtime lacks support for raw TCP and TLS APIs required by Nodemailer and as such Nodemailer will never work on it.

@andris9 net is supported now using the flag:

node_compat = true

in wrangler.toml