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Error when the command npx cypress open is executed

See original GitHub issue

Current behavior

I get this

error:C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\run_plugins.js:40
  invoke = (eventId, args = []) => {
         ^

SyntaxError: Unexpected token =
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)


    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\run_require_async_child.js:7:24)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\require_async_child.js:12:13)

-------------

I already created 3 projects and the error is always the same.

Desired behavior

No errors!

Test code to reproduce

I get this

error:C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\run_plugins.js:40
  invoke = (eventId, args = []) => {
         ^

SyntaxError: Unexpected token =
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)


    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\run_require_async_child.js:7:24)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\Users\Alan\AppData\Local\Cypress\Cache\10.0.2\Cypress\resources\app\node_modules\@packages\server\lib\plugins\child\require_async_child.js:12:13)

-------------

I already created 3 projects and the error is always the same.

Cypress Version

10.0.2

Other

No response

Issue Analytics

State:
Created a year ago
Comments:7 (4 by maintainers)

Top GitHub Comments

2reactions

edvitor13commented, Jun 3, 2022

This also happened to me, the way I found to solve it, provisionally, was to move all this “invoke” method into the constructor and add it to the “RunPlugins” object: “this.invoke”.

invoke = (eventId, args = []) => {
  const event = this.registeredEventsById[eventId]
  
  return event.handler(...args)
}

---->

constructor(...) {
...
  this.invoke = (eventId, args = []) => {
    const event = this.registeredEventsById[eventId]
    
    return event.handler(...args)
  }
}

1reaction

lmiller1990commented, Jun 9, 2022

@33Wil same question - what version of Node.js are on? Cypress requires v12. The error described here is the one you get when your version does not support class instance members:

v10.24.1
$ node -e 'class Foo { bar = () => {} }'                                                     
[eval]:1
class Foo { bar = () => {} }
                ^

SyntaxError: Unexpected token =
    at new Script (vm.js:83:7)
    at createScript (vm.js:277:10)
    at Object.runInThisContext (vm.js:329:10)
    at Object.<anonymous> ([eval]-wrapper:6:22)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at evalScript (internal/bootstrap/node.js:590:27)
    at startup (internal/bootstrap/node.js:265:9)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

I don’t think this is a bug in Cypress, it’s the error you get when using a Node.js version outside the ones we support. Likely older versions technically worked with Cypress 9, but now Cypress 10 uses the class instance syntax, the fact you are running an unsupported version of Node.js is more clear.

If anyone is encountering this on Node v12, happy to look into it, but for now I’m going to close this as there’s no obvious actionable bug.