Add new event 'page:error'

[chrisbreiding]

This will replace the current 'uncaught:exception' event, which is equivalent to when window.onerror fires. It will also fire when window.onunhandledrejection fires.

It's called signature should be:

cy.on('page:error', (error, runnable) => {}

We'll add a source property to indicate where it came from ('onerror' or 'unhandledrejection').

The user can return false to not handle the error.

We'll standardize the error from window.unhandledrejection, so that there's no reason property.

[jennifer-shehane]

Will this be a breaking change? I know a lot of users have the uncaught:exception event listener in their test code.

[chrisbreiding]

Yes, it will.

[jennifer-shehane]

@chrisbreiding Will this address this issue of listening to onerror on different subdomain? #3750

[jennifer-shehane]

Closing due to inactivity.