Can't break each loop early by returning false

Current behavior:

When running an .each loop and attempting to break the loop by doing return false;, Cypress doesn’t stop the loop, but instead explodes with:

CypressError: cy.then() failed because you are mixing up async and sync code.

In your callback function you invoked 1 or more cy commands but then returned a synchronous value.

Cypress commands are asynchronous and it doesn’t make sense to queue cy commands and yet return a synchronous value.

You likely forgot to properly chain the cy commands using another cy.then().

The value you synchronously returned was: ‘false’

Desired behavior:

Cypress should break the loop when returning false from an .each loop.

Steps to reproduce: (app code and test code)

1. Do a get + find, then loop through each of them with .each
2. return false at some arbitrary location, preferably inside an if statement to properly copy my situation
3. Get the error above

Versions

• Cypress: 3.5.0
• Node: 12.13.0
• Chrome

[begli80]

@jennifer-shehane What is the point of below if I am not able to perform any operations in my if block and only then break out of loop based on the condition.:

it('.each() - iterate over an array of elements', () => {
    cy.visit('https://example.cypress.io/commands/connectors')
    cy.get('.connectors-each-ul>li')
      .each(($el, index, $list) => {
        console.log(index)
        if (index === 1) {
          return false
        }
      })
  })

I have got the similar situation like chkashif167 below , where Im trying to break out of the each loop only after some operation based on the condition.But getting message :'cy.then() failed because you are mixing up async and sync code.

cy.get('.checkbox').each(($el, index, $list)=>{
        let checkBox=$el.prop('checked')
        if(checkBox&&index===0)
        {
            email.getPharmacyHealthOptionsPhone().eq(index).uncheck()
            email.getPharmacyHealthOptionsPhone().eq(1).check()  
            return false  
        }
})

So what is the workaround ?

[anthonychernenko]

@jennifer-shehane what should we do if need to run some async code inside .each and immediately break (like here https://github.com/cypress-io/cypress/issues/5485#issuecomment-562545976)?