Error [ERR_REQUIRE_ESM]: require() of ES Module during Cypress upgrade to the v10.0.1

Current behavior

When I try to upgrade Cypress to v10.0.1 I get “SyntaxError: Cannot use import statement outside a module”

Your configFile is invalid: /Users/xxx/Documents/Cypress/my_project/cypress.config.js

It threw an error when required, check the stack trace below:`

`/Users/xxx/Documents/Cypress/my_project/cypress.config.js:1
import { defineConfig } from "cypress";
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at Object.compileFunction (node:vm:352:18)
    at wrapSafe (node:internal/modules/cjs/loader:1033:15)
    at Module._compile (node:internal/modules/cjs/loader:1069:27)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at loadFile (/Users/xxxi/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:103:14)
    at EventEmitter. (/Users/xxx/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:146:38)
    at EventEmitter.emit (node:events:527:28)
    at EventEmitter.emit (node:domain:475:12)
    at process. (/Users/xxx/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/util.js:33:22)
    at process.emit (node:events:527:28)
    at process.emit (node:domain:475:12)
    at emit (node:internal/child_process:938:14)

I’ve read that the solution for this issue is adding "type": "module" in package.json but now I am getting another issue:

101 | 
  102 |     try {
> 103 |       return require(file)
      |              ^
  104 |     } catch (err) {
  105 |       originalError = err
  106 |       if (!err.stack.includes('[ERR_REQUIRE_ESM]') && !err.stack.includes('SyntaxError: Cannot use import statement outside a module')) {
  107 |         throw err

[Stack trace](http://localhost:55743/__launchpad/index.html#) Error [ERR_REQUIRE_ESM]: require() of ES Module /Users/xxx/Documents/Cypress/my_project/cypress.config.js from /Users/xxx/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js not supported. Instead change the require of cypress.config.js in /Users/xxx/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js to a dynamic import() which is available in all CommonJS modules. at loadFile (/Users/xxx/Library/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:103:14) at EventEmitter. (/Users/xxxLibrary/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:146:38) at EventEmitter.emit (node:events:527:28) at EventEmitter.emit (node:domain:475:12) at process. (/Users/xxxLibrary/Caches/Cypress/10.0.1/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/util.js:33:22) at process.emit (node:events:527:28) at process.emit (node:domain:475:12)

Do you have any ideas on how to solve it?

Cypress Version

10.0.1

Package Manager

npm

Operating system

Mac

Other

No response

[lmiller1990]

Are you able to share your existing project? Ideally a repo we could clone, but if that’s too much trouble, a package.json, cypress.json and cypress/plugins/index.js would be a good start.

If you could re-run the migration with DEBUG=cypress* and include the logs from the terminal, that would help, too!

It looks like it’s incorrectly generating a ES modules based config; if you just want to make it work, you could change to using CJS:

const { defineConfig } = require('cypress')

module.exports = defineConfig({
  // your config content here, as generated by the migration tool
})

If you could share a slimmed down version of the repo you want to migrate, that’d be great - we can work through it and find out what’s going wrong, so others can have a smooth migration process.

[cypress-bot[bot]]

Released in 10.0.2.

This comment thread has been locked. If you are still experiencing this issue after upgrading to Cypress v10.0.2, please open a new issue.