Cloudflare Developers•12mo ago

Use `pg` in Pages Function?

I want to access a PostgreSQL database in a function that will be deployed via Cloudflare Pages. Workers supports using pg, the common Node PostgreSQL database. But I can not make it work with the Functions in Pages. I get errors like this on pnpm wrangler pages dev . -:

✘ [ERROR] Could not resolve "events"

    ../node_modules/.pnpm/[email protected]/node_modules/pg-cloudflare/dist/index.js:1:29:
      1 │ import { EventEmitter } from 'events';
        ╵                              ~~~~~~~~

  The package "events" wasn't found on the file system but is built into node.
  Add the "nodejs_compat" compatibility flag to your Pages project to enable Node.js compatibility.

✘ [ERROR] Could not resolve "events"

    ../node_modules/.pnpm/[email protected]/node_modules/pg-cloudflare/dist/index.js:1:29:
      1 │ import { EventEmitter } from 'events';
        ╵                              ~~~~~~~~

  The package "events" wasn't found on the file system but is built into node.
  Add the "nodejs_compat" compatibility flag to your Pages project to enable Node.js compatibility.

If I understand the error message correctly, I am supposed to do pnpm wrangler pages dev . --compatibility-flag="nodejs_compat" - but that returns exactly the same error. (I know that in Workers I actually need to use node_compat (which sounds similar, but it something very different) - but that does not seem to exist for Pages)

2 Replies

kian•12mo ago

pg does indeed require node_compat, not nodejs_compat. You could use Postgres.js in Pages with nodejs_compat.

Jan Piotrowski (janpio)OP•12mo ago

Unfortunately not really an option as I am testing a library (Prisma) here that enables usage of pg, because that is what the library users are asking for. I found https://github.com/cloudflare/workers-sdk/issues/1074 and https://github.com/cloudflare/workers-sdk/pull/2541, but seems there was no conclusion to these.

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Use `pg` in Pages Function?