on(...) types do not match cy.stub() format

[bahmutov]

The TypeScript definition of Cypress.on and cy.on are not working correctly if you use cy.stub callback function. Example from Cypress window:alert documentation https://docs.cypress.io/api/events/catalog-of-events.html#Window-Alert

Notice red line when I am using cy.stub() callback, this is because I am using //@ts-check in my specs. The types correctly work if I use "regular" callback function

Both Cypress.on and cy.on show red lines and show an error

Same for cy.on('window:confirm', cy.stub())

Cypress v3.0.1

[brian-mann]

Released in 3.0.2.