Failing Express.js ESM Support

[noahflk]

Using this import:

import { serve } from "@upstash/workflow/express";

I get this error in an Express.js ESM app:

file:///XXX/node_modules/.pnpm/@upstash+workflow@0.2.1/node_modules/@upstash/workflow/chunk-ADOBNR4O.mjs:11
  throw Error('Dynamic require of "' + x + '" is not supported');
        ^

Error: Dynamic require of "path" is not supported

[manurana]

Apologies if this is unrelated, but I am getting another ESM error while running this in AWS lambda.
I created my own handler using the serve from @upstash/workflow

   ReferenceError: __dirname is not defined in ES module scope
       at node_modules/.pnpm/@jimp+plugin-print@0.22.12_@jimp+custom@0.22.12_@jimp+plugin-blit@0.22.12_@jimp+custom@0.22.12_/node_modules/@jimp/plugin-print/dist/index.js (file:///xxxb/kbackend/.sst.config.1738925600291.mjs:230589:41)

The function is being bundled with esbuild before deploying, and the error shows up in the bundling

[priyanshuxdev]

hi noahflk, instead of directly importing the (serve) function using import statement
Use the snippet below -:

import { createRequire } from 'module';
const require = createRequire(import.meta.url)
const { serve } = require('@upstash/workflow/express');

hope it works : )

[technoligest]

+1 to this error.

[Vighnesh-code]

hi noahflk, instead of directly importing the (serve) function using import statement Use the snippet below -:

import { createRequire } from 'module'; const require = createRequire(import.meta.url) const { serve } = require('@upstash/workflow/express');

hope it works : )

Worked, Thanks @priyanshuxdev

[chentschel]

import path from "path";

const { serve } = await import(
  path.join(process.cwd(), "node_modules", "@upstash/workflow/express")
);

Should also do .