Automatically save Cypress fixture from API response - was working before and has broken

[activedecay]

Current behavior

While saving responses in a request handler, such as cy.intercept(..., REQUEST_HANDLER) I get a new error that says I can't execute 'writeFile' from outside a support file. The function defined is in a support file. This used to work.

Desired behavior

https://stackoverflow.com/questions/72664114/automatically-save-cypress-fixture-from-api-response

This use to work, and I don't recall when I started seeing this.

Test code to reproduce

The code example is in the stack overflow answer pasted above. Here it is again.

Note: even when moving the cy.now call to the spec file, it throws the exact same error, complaining that the cy.writeFile call doesn't exist in a spec or support file.

describe('fixture creation', () => {
  it('should save fixtures of every endpoint that matches a url', () => {
    cy.login()
    cy.visit('/ubmc/system/pci-topology')
    cy.intercept('https://covfefe/redfish/v1/Chassis/Asrock/PCIeDevices/**',
      req => {
        req.continue((res) => {
          cy.now('writeFile',
            `cypress/fixtures/${ req.url.replace('https://covfefe/', '') }.json`,
            res.body)
        })
      })
  })

  it('should produce results from the fixtures directory', () => {
    cy.intercept('**redfish/v1/Chassis/Asrock/PCIeDevices/**', req => {
      req.reply({
        fixture: `${ req.url.replace('https://covfefe/', '') }.json`
      })
    })

    // @ts-ignore
    cy.login()
    cy.visit('/ubmc/system/pci-topology')
  })
})

Cypress Version

v13.6.3

Node version

v18.12.0

Operating System

linux

Debug Logs

npm -v 8.19.2; node -v v18.12.0

uname -a; lsb_release -a
Linux beastmode 6.8.0-45-generic #45~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Sep 11 15:25:05 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.4 LTS
Release:	22.04
Codename:	jammy


(uncaught exception)CypressError: cy.writeFile() must only be invoked from the spec file or support file.
(xhr)GET https://i-tyan/redfish/v1/Managers/SDS-7471481/LogServices/Log/Entries
managersPath
(xhr)GET https://i-tyan/redfish/v1/Systems/Asrock
systemsPath
CypressError
The following error originated from your application code, not from Cypress. It was caused by an unhandled promise rejection.

> cy.writeFile() must only be invoked from the spec file or support file.

When Cypress detects uncaught errors originating from your application it will automatically fail the current test.

This behavior is configurable, and you can choose to turn this off by listening to the uncaught:exception event.Learn more
cypress/e2e/wait.cy.ts:2:6
  1 | export const wait = (ms: number = 30000) => {
> 2 |   cy.wait('@sessionService', {timeout: ms})
    |      ^

Other

If there were some way to write a fixture file for every response in a normal fashion, please let me know. I feel like this hacky solution is being guarded against and I would like to understand what changed.

Thank you!