A way to disable Cypress global exception handler

It would be nice to turn off the Cypress global exception handler per test. For example, we have our own exception handler that sends the errors to the remote crash reporting server. We could write an e2e test to make sure it works as expected. We can stub the server route and then raise an error in the window’s context on purpose.

cy.window()
        .then(win => {
          function raise () {
            throw new Error(`E2E test error`)
          }
          win.setTimeout(raise, 100)
        })
        .wait('@error')

The route is working, but the Cypress own crash handler thinks this error was unhandled and fails the test. If we could turn the Cypress crash handler just for this test, it would make a lot of sense.

[brian-mann]

Right now its possible to “hack” this by severing Cypress’s ability to detect uncaught errors like this:

cy.visit("/app", {
  onBeforeLoad: (win) => {
    win.onerror = null
  }
})

or simply by doing…

Cypress.Cy.prototype.onUncaughtException = function(){}

[brian-mann]

It’s part of a different error message than that one which redirect you here:

https://docs.cypress.io/api/events/catalog-of-events.html#Uncaught-Exceptions